big update

CMakeLists.txt

@@ -20,7 +20,12 @@ include_directories(${OPENMESH_INCLUDE_DIRS} ${CMAKE_SOURCE_DIR}/vendor)
 # add executable
 add_executable(asteroidgen
 	src/main.cpp
-	src/gen.cpp
+	src/Application.cpp
+	src/Polygoniser.cpp
+	src/TextureMapper.cpp
+#	src/TexturePainter.cpp
+#	src/gen.cpp
+	vendor/stb_impl.cpp
 	vendor/mersenne-twister.cpp
 	vendor/OpenNL_psm.c
 	vendor/glad.c

ToDo.txt

@@ -0,0 +1,21 @@
+LIB:
+- improve marching cube
+- create patches
+- use lscm
+
+- mesh cleanup
+
+- profile texture generation
+- improve polygonizer
+
+- use glm::noise or stb noise?
+- view dependent progressive mesh
+
+- vertex color?
+
+GUI:
+- Skybox: http://ogldev.atspace.co.uk/www/tutorial25/tutorial25.html
+- Progress
+- Arcball
+- PBR https://learnopengl.com/#!PBR/Lighting
+- save

shader/standard.fragment.glsl

@@ -0,0 +1,64 @@
+#version 330 core
+
+// Interpolated values from the vertex shaders
+in vec2 UV;
+in vec3 Position_worldspace;
+in vec3 Normal_cameraspace;
+in vec3 EyeDirection_cameraspace;
+in vec3 LightDirection_cameraspace;
+
+// Ouput data
+out vec3 color;
+
+// Values that stay constant for the whole mesh.
+uniform sampler2D tAlbedo;
+uniform mat4 MV;
+uniform vec3 LightPosition_worldspace;
+
+void main(){
+
+	// Light emission properties
+	// You probably want to put them as uniforms
+	vec3 LightColor = vec3(1,1,1);
+	float LightPower = 400.0f;
+	
+	// Material properties
+	vec3 MaterialDiffuseColor = texture( tAlbedo, UV ).rgb;
+	vec3 MaterialAmbientColor = vec3(0.1,0.1,0.1) * MaterialDiffuseColor;
+	vec3 MaterialSpecularColor = vec3(0.03,0.03,0.03);
+
+	// Distance to the light
+	float distance = length( LightPosition_worldspace - Position_worldspace );
+
+	// Normal of the computed fragment, in camera space
+	vec3 n = normalize( Normal_cameraspace );
+	// Direction of the light (from the fragment to the light)
+	vec3 l = normalize( LightDirection_cameraspace );
+	// Cosine of the angle between the normal and the light direction, 
+	// clamped above 0
+	//  - light is at the vertical of the triangle -> 1
+	//  - light is perpendicular to the triangle -> 0
+	//  - light is behind the triangle -> 0
+	float cosTheta = clamp( dot( n,l ), 0,1 );
+	
+	// Eye vector (towards the camera)
+	vec3 E = normalize(EyeDirection_cameraspace);
+	// Direction in which the triangle reflects the light
+	vec3 R = reflect(-l,n);
+	// Cosine of the angle between the Eye vector and the Reflect vector,
+	// clamped to 0
+	//  - Looking into the reflection -> 1
+	//  - Looking elsewhere -> < 1
+	float cosAlpha = clamp( dot( E,R ), 0,1 );
+	
+	color = 
+		// Ambient : simulates indirect lighting
+		MaterialAmbientColor +
+		// Diffuse : "color" of the object
+		MaterialDiffuseColor * LightColor * LightPower * cosTheta / (distance*distance)
+		+
+		// Specular : reflective highlight, like a mirror
+		MaterialSpecularColor * LightColor * LightPower * pow(cosAlpha,5) / (distance*distance);
+
+
+}

shader/standard.vertex.glsl

@@ -0,0 +1,44 @@
+#version 330 core
+
+// Input vertex data, different for all executions of this shader.
+in vec3 vPosition;
+in vec2 vTexCoord;
+in vec3 vNormal;
+
+// Output data ; will be interpolated for each fragment.
+out vec2 UV;
+out vec3 Position_worldspace;
+out vec3 Normal_cameraspace;
+out vec3 EyeDirection_cameraspace;
+out vec3 LightDirection_cameraspace;
+
+// Values that stay constant for the whole mesh.
+uniform mat4 MVP;
+uniform mat4 V;
+uniform mat4 M;
+uniform vec3 LightPosition_worldspace;
+
+void main(){
+
+	// Output position of the vertex, in clip space : MVP * position
+	gl_Position =  MVP * vec4(vPosition,1);
+	
+	// Position of the vertex, in worldspace : M * position
+	Position_worldspace = (M * vec4(vPosition,1)).xyz;
+	
+	// Vector that goes from the vertex to the camera, in camera space.
+	// In camera space, the camera is at the origin (0,0,0).
+	vec3 vertexPosition_cameraspace = ( V * M * vec4(vPosition,1)).xyz;
+	EyeDirection_cameraspace = vec3(0,0,0) - vertexPosition_cameraspace;
+
+	// Vector that goes from the vertex to the light, in camera space. M is ommited because it's identity.
+	vec3 LightPosition_cameraspace = ( V * vec4(LightPosition_worldspace,1)).xyz;
+	LightDirection_cameraspace = LightPosition_cameraspace + EyeDirection_cameraspace;
+	
+	// Normal of the the vertex, in camera space
+	Normal_cameraspace = ( V * M * vec4(vNormal,0)).xyz; // Only correct if ModelMatrix does not scale the model ! Use its inverse transpose if not.
+	
+	// UV of the vertex. No special space for this one.
+	UV = vTexCoord;
+}
+

src/Application.cpp

@@ -0,0 +1,736 @@
+#include "Application.h"
+
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+
+#include <glm/mat4x4.hpp>
+#include <glm/mat3x3.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+#include <imgui.h>
+#include <imgui_impl_glfw_gl3.h>
+
+#include <stb_image.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <iostream>
+#include <fstream>
+#include <map>
+#include <vector>
+
+using glm::vec3;
+using glm::uvec3;
+using std::map;
+using std::vector;
+
+void calculateNormals(const vector<vec3> &vtx, vector<uvec3> &tri,
+		vector<vec3> &normals) {
+	normals.clear();
+	normals.resize(vtx.size(), vec3(0));
+	for (size_t i = 0; i < tri.size(); i++) {
+		int a = tri[i].x, b = tri[i].y, c = tri[i].z;
+		vec3 faceNormal = normalize(
+				glm::cross(vtx[b] - vtx[a], vtx[c] - vtx[a]));
+		normals[a] += faceNormal;
+		normals[b] += faceNormal;
+		normals[c] += faceNormal;
+	}
+	for (size_t i = 0; i < normals.size(); i++)
+		normals[i] = glm::normalize(normals[i]);
+
+}
+
+void moveToMean(vector<vec3> &vtx) {
+	vec3 mean(0);
+	for (size_t i = 0; i < vtx.size(); i++) {
+		mean += vtx[i];
+	}
+	mean *= vec3(1.f / vtx.size());
+	for (size_t i = 0; i < vtx.size(); i++) {
+		vtx[i] -= mean;
+	}
+}
+
+void smooth(vector<vec3> &vtx, const vector<uvec3> &tri) {
+	vector<vec3> cogs(vtx.size(), vec3(0.f));
+	vector<int> valence(vtx.size(), 0);
+
+	for (size_t iTri = 0; iTri < tri.size(); iTri++) {
+		const uvec3 &idx = tri[iTri];
+		for (size_t iE = 0; iE < 3; iE++) {
+			valence[idx[iE]] += 2;
+			cogs[idx[iE]] += vtx[idx[(iE + 1) % 3]];
+			cogs[idx[iE]] += vtx[idx[(iE + 2) % 3]];
+		}
+	}
+	/*
+	 for (v_it = mesh.vertices_begin(); v_it != v_end; ++v_it) {
+	 cog[0] = cog[1] = cog[2] = valence = 0.0;
+
+	 for (vv_it = mesh.vv_iter(*v_it); vv_it.is_valid(); ++vv_it) {
+	 cog += mesh.point(*vv_it);
+	 ++valence;
+	 }
+	 cogs.push_back(cog / valence);
+	 }
+	 for (v_it = mesh.vertices_begin(), cog_it = cogs.begin(); v_it != v_end;
+	 ++v_it, ++cog_it)
+	 if (!mesh.is_boundary(*v_it))
+	 mesh.set_point(*v_it, *cog_it);
+
+	 */
+	for (size_t i = 0; i < vtx.size(); i++) {
+//		vtx[i] = vtx[i] * vec3(0.8)
+//				+ cogs[i] * vec3(0.2f / valence[i]);
+		vtx[i] = cogs[i] * vec3(1.f / valence[i]);
+	}
+}
+
+void saveAttrib(std::ostream &out, const char *prefix, vector<vec3> &elements) {
+	for (size_t i = 0; i < elements.size(); i++) {
+		out << prefix << elements[i].x << " " << elements[i].y << " "
+				<< elements[i].z << "\n";
+	}
+}
+
+void saveAttrib(std::ostream &out, const char *prefix,
+		vector<glm::vec2> &elements) {
+	for (size_t i = 0; i < elements.size(); i++) {
+		out << prefix << elements[i].x << " " << elements[i].y << "\n";
+	}
+}
+
+void saveFaces(std::ostream &out, const vector<uvec3> &tris, size_t attribs) {
+	for (size_t i = 0; i < tris.size(); i++) {
+		out << "f";
+
+		for (size_t j = 0; j < 3; j++) {
+			int v = tris[i][j] + 1;
+			out << " " << v;
+			if (attribs > 1)
+				out << "/" << v;
+			if (attribs > 2)
+				out << "/" << v;
+			out << " ";
+		}
+
+		out << "\n";
+	}
+}
+
+void calculateEdges(const vector<vec3> &vtx, vector<uvec3> &tri,
+		vector<glm::uvec4> &edges) {
+	edges.clear();
+	map<std::pair<uint32_t, uint32_t>, uint32_t> edgeMap;
+	for (size_t iTri = 0; iTri < tri.size(); iTri++) {
+		uvec3 idx = tri[iTri];
+		for (size_t k = 0; k < 3; k++) {
+			int a = idx[k];
+			int b = idx[(k + 1) % 3];
+			glm::uvec4 edge1(std::min(a, b), std::max(a, b), iTri, 0);
+			auto it1 = edgeMap.find(std::make_pair(edge1.x, edge1.y));
+			if (it1 != edgeMap.end()) {
+				edges[it1->second].z = iTri;
+			} else {
+				edges.push_back(edge1);
+			}
+		}
+	}
+}
+
+void computeTangentBasis(vector<vec3> & vertices, vector<glm::vec2> & uvs,
+		vector<vec3> & normals, vector<vec3> & tangents,
+		vector<vec3> & bitangents) {
+
+	for (size_t i = 0; i < vertices.size(); i += 3) {
+
+		// Shortcuts for vertices
+		vec3 & v0 = vertices[i + 0];
+		vec3 & v1 = vertices[i + 1];
+		vec3 & v2 = vertices[i + 2];
+
+		// Shortcuts for UVs
+		glm::vec2 & uv0 = uvs[i + 0];
+		glm::vec2 & uv1 = uvs[i + 1];
+		glm::vec2 & uv2 = uvs[i + 2];
+
+		// Edges of the triangle : postion delta
+		vec3 deltaPos1 = v1 - v0;
+		vec3 deltaPos2 = v2 - v0;
+
+		// UV delta
+		glm::vec2 deltaUV1 = uv1 - uv0;
+		glm::vec2 deltaUV2 = uv2 - uv0;
+
+		float r = 1.0f / (deltaUV1.x * deltaUV2.y - deltaUV1.y * deltaUV2.x);
+		vec3 tangent = (deltaPos1 * deltaUV2.y - deltaPos2 * deltaUV1.y) * r;
+		vec3 bitangent = (deltaPos2 * deltaUV1.x - deltaPos1 * deltaUV2.x) * r;
+		// Set the same tangent for all three vertices of the triangle.
+		// They will be merged later, in vboindexer.cpp
+		tangents.push_back(tangent);
+		tangents.push_back(tangent);
+		tangents.push_back(tangent);
+
+		// Same thing for binormals
+		bitangents.push_back(bitangent);
+		bitangents.push_back(bitangent);
+		bitangents.push_back(bitangent);
+
+	}
+}
+
+static bool glck(const char* call) {
+	int err = glGetError();
+	if (err == 0) {
+		return true;
+	} else {
+		switch (err) {
+		case GL_INVALID_VALUE:
+			printf("GL_INVALID_VALUE: %s\n", call);
+			break;
+		case GL_INVALID_ENUM:
+			printf("GL_INVALID_ENUM: %s\n", call);
+			break;
+		case GL_INVALID_OPERATION:
+			printf("GL_INVALID_OPERATION: %s\n", call);
+			break;
+		default:
+			printf("UNKNOWN Error: %s\n", call);
+		}
+		return false;
+	}
+}
+
+#define GLCK(a) {a; assert(glck(#a));}
+
+static void error_callback(int error, const char* description) {
+	fprintf(stderr, "Error: %s\n", description);
+}
+static void key_callback(GLFWwindow* window, int key, int scancode, int action,
+		int mods) {
+	Application::instance().KeyCallback(window, key, scancode, action, mods);
+}
+
+static void mouse_button_callback(GLFWwindow* window, int button, int action,
+		int mods) {
+	Application::instance().MouseButtonCallback(window, button, action, mods);
+
+}
+static void scroll_callback(GLFWwindow* window, double xoffset,
+		double yoffset) {
+	Application::instance().ScrollCallback(window, xoffset, yoffset);
+}
+
+static void char_callback(GLFWwindow* window, unsigned int c) {
+	Application::instance().CharCallback(window, c);
+}
+
+Application::Application() :
+		window(0), density(), densityIsolevel(0.2), polygonizer(density,
+				densityIsolevel), textureSize(512), texturemapper(density,
+				textureSize), programId(0), vPositionLoc(-1), vTexCoordLoc(-1), vNormalLoc(
+				-1), meteoridCount(1000), meteroidMinRadius(0.005), meteroidMaxRadius(
+				0.2), meteroidSizeExponent(2048), densityFrequency(2), densityOctave(
+				2), densityScale(1.0f), resolution(0.1), viewDistance(3.0f), fpsMode(
+				false) {
+	init();
+}
+
+Application::~Application() {
+	shutdown();
+}
+
+Application &Application::instance() {
+	static Application app;
+	return app;
+}
+
+void Application::init() {
+	glfwSetErrorCallback(error_callback);
+
+	if (!glfwInit())
+		exit(EXIT_FAILURE);
+
+	//	glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
+	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+
+	window = glfwCreateWindow(1200, 800, "Procedural Asteroid Generator", NULL,
+	NULL);
+	if (!window) {
+		glfwTerminate();
+		exit(EXIT_FAILURE);
+	}
+
+	GLFWimage icon;
+	int n;
+	icon.pixels = stbi_load("icon.png", &icon.width, &icon.height, &n, 4);
+	if (icon.pixels) {
+		glfwSetWindowIcon(window, 1, &icon);
+		stbi_image_free(icon.pixels);
+	} else
+		std::cout << "Failed to load icon.png" << std::endl;
+
+	glfwSetMouseButtonCallback(window, mouse_button_callback);
+	glfwSetScrollCallback(window, scroll_callback);
+	glfwSetKeyCallback(window, key_callback);
+	glfwSetCharCallback(window, char_callback);
+
+	glfwMakeContextCurrent(window);
+	gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
+	glfwSwapInterval(1);
+
+	std::cout << "OpenGL version: " << glGetString(GL_VERSION) << std::endl;
+	std::cout << "GLSL version: " << glGetString(GL_SHADING_LANGUAGE_VERSION)
+			<< std::endl;
+	std::cout << "Vendor: " << glGetString(GL_VENDOR) << std::endl;
+	std::cout << "Renderer: " << glGetString(GL_RENDERER) << std::endl;
+
+	ImGui_ImplGlfwGL3_Init(window, false);
+
+	GLCK(glGenVertexArrays(1, &vertexArrayId))
+	GLCK(glGenBuffers(1, &vPositionId))
+	GLCK(glGenBuffers(1, &vTexCoordId))
+	GLCK(glGenBuffers(1, &vNormalId))
+	GLCK(glGenBuffers(1, &indexBufferId))
+
+	GLCK(glGenTextures(1, &tAlbedoId))
+	GLCK(glGenTextures(1, &tNormalId))
+	GLCK(glGenTextures(1, &tRoughnessId))
+	GLCK(glGenTextures(1, &tMetalicId))
+
+	loadShader();
+	updateVertexArrayObject();
+	generateAsteroid();
+	uploadMesh();
+}
+
+void Application::shutdown() {
+	ImGui_ImplGlfwGL3_Shutdown();
+
+	GLCK(glDeleteBuffers(1, &vPositionId))
+	GLCK(glDeleteBuffers(1, &vTexCoordId))
+	GLCK(glDeleteBuffers(1, &vNormalId))
+	GLCK(glDeleteBuffers(1, &indexBufferId))
+	GLCK(glDeleteVertexArrays(1, &vertexArrayId))
+
+	glfwDestroyWindow(window);
+	glfwTerminate();
+}
+
+void Application::KeyCallback(GLFWwindow* window, int key, int scancode,
+		int action, int mods) {
+	if (key == GLFW_KEY_ESCAPE && action == GLFW_RELEASE)
+		glfwSetWindowShouldClose(window, GLFW_TRUE);
+	if (ImGui::IsMouseHoveringAnyWindow())
+		ImGui_ImplGlfwGL3_KeyCallback(window, key, scancode, action, mods);
+	else {
+		if (key == GLFW_KEY_TAB && action == GLFW_RELEASE) {
+			toogleFpsMode();
+		}
+	}
+}
+
+void Application::MouseButtonCallback(GLFWwindow* window, int button,
+		int action, int mods) {
+	ImGui_ImplGlfwGL3_MouseButtonCallback(window, button, action, mods);
+}
+void Application::ScrollCallback(GLFWwindow* window, double xoffset,
+		double yoffset) {
+	if (ImGui::IsMouseHoveringAnyWindow())
+		ImGui_ImplGlfwGL3_ScrollCallback(window, xoffset, yoffset);
+	else
+		viewDistance -= yoffset * viewDistance * 0.1;
+}
+void Application::CharCallback(GLFWwindow* window, unsigned int c) {
+
+	ImGui_ImplGlfwGL3_CharCallback(window, c);
+}
+
+void Application::toogleFpsMode() {
+	if (fpsMode) {
+		fpsMode = false;
+	} else {
+		fpsMode = true;
+		fpsTrafo = glm::lookAt(vec3(0, 0, viewDistance), vec3(0, 0, 0),
+				vec3(0, 1, 0));
+	}
+}
+
+void Application::generateAsteroid() {
+	std::srand(123);
+
+	if (density.getImpacts().size() == 0)
+		density.addRandomImpacts(1000, 0.2, 0.01, 0.005, 0.2, 4096);
+	//density.saveCrossSection("density.png", 512);
+
+	polygonizer.polygonize(resolution);
+	{
+		std::ofstream out("stage1.obj");
+		saveAttrib(out, "v ", polygonizer.vertices);
+		saveFaces(out, polygonizer.indices, 1);
+	}
+
+	smooth(polygonizer.vertices, polygonizer.indices);
+	{
+		std::ofstream out("stage2.obj");
+		saveAttrib(out, "v ", polygonizer.vertices);
+		saveFaces(out, polygonizer.indices, 1);
+	}
+	calculateNormals(polygonizer.vertices, polygonizer.indices, normals);
+	{
+		std::ofstream out("stage3.obj");
+		saveAttrib(out, "v ", polygonizer.vertices);
+		saveAttrib(out, "vn ", normals);
+		saveFaces(out, polygonizer.indices, 2);
+	}
+
+	vector<glm::uvec4> edges;
+	std::cout << "Vertices: " << polygonizer.vertices.size() << std::endl;
+	std::cout << "Triangles: " << polygonizer.indices.size() << std::endl;
+
+	texturemapper.map(polygonizer.vertices, normals, polygonizer.indices);
+	moveToMean(texturemapper.vertices);
+
+	{
+		std::ofstream out("stage4.obj");
+		saveAttrib(out, "v ", texturemapper.vertices);
+		saveAttrib(out, "vn ", texturemapper.normals);
+		saveAttrib(out, "vt ", texturemapper.texcoords);
+		saveFaces(out, texturemapper.indices, 3);
+	}
+}
+
+bool Application::bindVertexAttrib(GLuint id, GLint loc, GLuint size) {
+	if (loc < 0)
+		return false;
+	GLCK(glBindBuffer(GL_ARRAY_BUFFER, id))
+	GLCK(glEnableVertexAttribArray(loc))
+	GLCK(glVertexAttribPointer(loc,                  // attribute
+			size,// size
+			GL_FLOAT,// type
+			GL_FALSE,// normalized?
+			0,// stride
+			(void* ) 0// array buffer offset
+			))
+	return true;
+}
+
+void Application::updateVertexArrayObject() {
+	GLCK(glBindVertexArray(vertexArrayId))
+
+	if (vPositionLoc >= 0)
+		GLCK(glDisableVertexAttribArray(vPositionLoc))
+	if (vNormalLoc >= 0)
+		GLCK(glDisableVertexAttribArray(vNormalLoc))
+	if (vTexCoordLoc >= 0)
+		GLCK(glDisableVertexAttribArray(vTexCoordLoc))
+
+	bindVertexAttrib(vPositionId, vPositionLoc, 3);
+	bindVertexAttrib(vNormalId, vNormalLoc, 3);
+	bindVertexAttrib(vTexCoordId, vTexCoordLoc, 2);
+
+	GLCK(glBindVertexArray(0))
+}
+
+GLuint Application::loadProgram(const std::string &name) {
+
+	// Create the shaders
+	GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
+	GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
+
+	// Read the Vertex Shader code from the file
+	std::string VertexShaderCode;
+	std::string vertex_file_path = "shader/" + name + ".vertex.glsl";
+	std::ifstream VertexShaderStream(vertex_file_path, std::ios::in);
+	if (VertexShaderStream.is_open()) {
+		std::string Line = "";
+		while (getline(VertexShaderStream, Line))
+			VertexShaderCode += "\n" + Line;
+		VertexShaderStream.close();
+	} else {
+		std::cout << "Failed to open " << vertex_file_path << std::endl;
+		return 0;
+	}
+
+	// Read the Fragment Shader code from the file
+	std::string FragmentShaderCode;
+	std::string fragment_file_path = "shader/" + name + ".fragment.glsl";
+	std::ifstream FragmentShaderStream(fragment_file_path, std::ios::in);
+	if (FragmentShaderStream.is_open()) {
+		std::string Line = "";
+		while (getline(FragmentShaderStream, Line))
+			FragmentShaderCode += "\n" + Line;
+		FragmentShaderStream.close();
+	} else {
+		std::cout << "Failed to open " << vertex_file_path << std::endl;
+		return 0;
+	}
+
+	GLint Result = GL_FALSE;
+	int InfoLogLength;
+
+	// Compile Vertex Shader
+	std::cout << "Compiling vertex shader : " << name << std::endl;
+	char const * VertexSourcePointer = VertexShaderCode.c_str();
+	glShaderSource(VertexShaderID, 1, &VertexSourcePointer, NULL);
+	glCompileShader(VertexShaderID);
+
+	// Check Vertex Shader
+	glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
+	glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
+	if (InfoLogLength > 0) {
+		vector<char> VertexShaderErrorMessage(InfoLogLength + 1);
+		glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL,
+				&VertexShaderErrorMessage[0]);
+		printf("%s\n", &VertexShaderErrorMessage[0]);
+	}
+
+	// Compile Fragment Shader
+	std::cout << "Compiling fragment shader : " << name << std::endl;
+
+	char const * FragmentSourcePointer = FragmentShaderCode.c_str();
+	glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer, NULL);
+	glCompileShader(FragmentShaderID);
+
+	// Check Fragment Shader
+	glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
+	glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
+	if (InfoLogLength > 0) {
+		vector<char> FragmentShaderErrorMessage(InfoLogLength + 1);
+		glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL,
+				&FragmentShaderErrorMessage[0]);
+		printf("%s\n", &FragmentShaderErrorMessage[0]);
+	}
+
+	// Link the program
+	std::cout << "Linking program : " << name << std::endl;
+
+	GLuint ProgramID = glCreateProgram();
+	glAttachShader(ProgramID, VertexShaderID);
+	glAttachShader(ProgramID, FragmentShaderID);
+	glLinkProgram(ProgramID);
+
+	// Check the program
+	glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
+	glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
+	if (InfoLogLength > 0) {
+		vector<char> ProgramErrorMessage(InfoLogLength + 1);
+		glGetProgramInfoLog(ProgramID, InfoLogLength, NULL,
+				&ProgramErrorMessage[0]);
+		printf("%s\n", &ProgramErrorMessage[0]);
+	}
+
+	glDetachShader(ProgramID, VertexShaderID);
+	glDetachShader(ProgramID, FragmentShaderID);
+
+	glDeleteShader(VertexShaderID);
+	glDeleteShader(FragmentShaderID);
+
+	return ProgramID;
+}
+
+void Application::loadShader() {
+	if (programId >= 0)
+		GLCK(glDeleteProgram(programId))
+	programId = loadProgram("standard");
+
+	GLCK(MVPloc = glGetUniformLocation(programId, "MVP"))
+	GLCK(Mloc = glGetUniformLocation(programId, "M"))
+	GLCK(Vloc = glGetUniformLocation(programId, "V"))
+	GLCK(
+			LightPosition_worldspaceloc = glGetUniformLocation(programId, "LightPosition_worldspace"))
+
+	GLCK(vPositionLoc = glGetAttribLocation(programId, "vPosition"))
+	GLCK(vTexCoordLoc = glGetAttribLocation(programId, "vTexCoord"))
+	GLCK(vNormalLoc = glGetAttribLocation(programId, "vNormal"))
+
+	GLCK(tAlbedoLoc = glGetAttribLocation(programId, "tAlbedo"))
+	GLCK(tNormalLoc = glGetAttribLocation(programId, "tNormal"))
+	GLCK(tRoughnessLoc = glGetAttribLocation(programId, "tRoughness"))
+	GLCK(tMetalicLoc = glGetAttribLocation(programId, "tMetalic"))
+}
+
+void Application::uploadMesh() {
+	GLCK(glBindVertexArray(vertexArrayId))
+
+	GLCK(glBindBuffer(GL_ARRAY_BUFFER, vPositionId))
+	GLCK(
+			glBufferData(GL_ARRAY_BUFFER, texturemapper.vertices.size() * sizeof(vec3), texturemapper.vertices.data(), GL_STATIC_DRAW))
+
+	GLCK(glBindBuffer(GL_ARRAY_BUFFER, vTexCoordId))
+	GLCK(
+			glBufferData(GL_ARRAY_BUFFER, texturemapper.texcoords.size() * sizeof(glm::vec2), texturemapper.texcoords.data(), GL_STATIC_DRAW))
+
+	GLCK(glBindBuffer(GL_ARRAY_BUFFER, vNormalId))
+	GLCK(
+			glBufferData(GL_ARRAY_BUFFER, texturemapper.normals.size() * sizeof(vec3), texturemapper.normals.data(), GL_STATIC_DRAW))
+
+	GLCK(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBufferId))
+	GLCK(
+			glBufferData(GL_ELEMENT_ARRAY_BUFFER, texturemapper.indices.size() * sizeof(uvec3), texturemapper.indices.data(), GL_STATIC_DRAW))
+
+	GLCK(glBindVertexArray(0))
+
+	glBindTexture(GL_TEXTURE_2D, tAlbedoId);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, texturemapper.getTextureSize(),
+			texturemapper.getTextureSize(), 0, GL_BGR, GL_UNSIGNED_BYTE,
+			texturemapper.albedo.data());
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+}
+
+void Application::renderMesh() {
+	GLCK(glBindVertexArray(vertexArrayId))
+	GLCK(
+			glDrawElements(GL_TRIANGLES, texturemapper.indices.size() * 3, GL_UNSIGNED_INT, (void* ) 0))
+	GLCK(glBindVertexArray(0))
+
+}
+
+void Application::prepareShader() {
+	glm::mat4 model(1.0f);
+	glm::mat4 view;
+
+	if (fpsMode) {
+		glm::vec4 movement(0.0);
+		if (fpsMode) {
+			if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS) {
+				movement += glm::vec4(0.0, 0.0, 0.1, 0.0);
+			} else if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS) {
+				movement -= glm::vec4(0.0, 0.0, 0.1, 0.0);
+			}
+		}
+		glm::vec3 absolute = glm::transpose(fpsTrafo) * movement;
+		fpsTrafo = glm::translate(fpsTrafo, absolute);
+		view = fpsTrafo;
+	} else {
+		model = glm::rotate(model, (float) glfwGetTime(), vec3(0.f, 1.f, 0.f));
+
+		view = glm::lookAt(vec3(0, 0, viewDistance), // Camera is at (4,3,3), in World Space
+		vec3(0, 0, 0), // and looks at the origin
+		vec3(0, 1, 0) // Head is up (set to 0,-1,0 to look upside-down)
+				);
+	}
+	glm::mat4 perspective = glm::perspective(glm::radians(45.0f),
+			(float) width / (float) height, 0.1f, 100.0f);
+	glm::mat4 mvp = perspective * view * model;
+
+	GLCK(glUseProgram(programId))
+	if (MVPloc >= 0) {
+		GLCK(glUniformMatrix4fv(MVPloc, 1, GL_FALSE, glm::value_ptr(mvp)))
+	}
+	if (Mloc >= 0) {
+		GLCK(glUniformMatrix4fv(Mloc, 1, GL_FALSE, glm::value_ptr(model)))
+	}
+	if (Vloc >= 0) {
+		GLCK(glUniformMatrix4fv(Vloc, 1, GL_FALSE, glm::value_ptr(view)))
+	}
+	if (LightPosition_worldspaceloc >= 0) {
+		vec3 LightPosition_worldspace(10.0f, 10.0f, 10.0f);
+		GLCK(
+				glUniform3fv(LightPosition_worldspaceloc, 1, glm::value_ptr(LightPosition_worldspace)))
+	}
+
+	int idx = 0;
+	if (tAlbedoLoc >= 0) {
+		glUniform1i(tAlbedoLoc, idx);
+		glActiveTexture(GL_TEXTURE0 + idx);
+		glBindTexture(GL_TEXTURE_2D, tAlbedoId);
+		idx++;
+	}
+	if (tNormalLoc >= 0) {
+		glUniform1i(tNormalLoc, idx);
+		glActiveTexture(GL_TEXTURE0 + idx);
+		glBindTexture(GL_TEXTURE_2D, tNormalId);
+		idx++;
+	}
+	if (tRoughnessLoc >= 0) {
+		glUniform1i(tRoughnessLoc, idx);
+		glActiveTexture(GL_TEXTURE0 + idx);
+		glBindTexture(GL_TEXTURE_2D, tRoughnessId);
+		idx++;
+	}
+	if (tMetalicLoc >= 0) {
+		glUniform1i(tMetalicLoc, idx);
+		glActiveTexture(GL_TEXTURE0 + idx);
+		glBindTexture(GL_TEXTURE_2D, tMetalicId);
+		idx++;
+	}
+}
+
+void Application::gui() {
+	ImGui::Begin("Mesh Generation");
+	ImGui::Text("Vertices: %lu, Triangles: %lu", polygonizer.vertices.size(),
+			polygonizer.indices.size());
+	//ImGui::InputFloat("Resolution", &resolution);
+	ImGui::SliderFloat("Resolution", &resolution, 0.1, 0.001, "%.3f", 0.1);
+	if (ImGui::SliderFloat("Frequency", &densityFrequency, 1, 10, "%.0f", 1))
+		density.setFrequency(densityFrequency);
+	if (ImGui::SliderFloat("Octave", &densityOctave, 1, 10, "%.0f", 1))
+		density.setOctave(densityOctave);
+
+	//	if (ImGui::InputFloat("Frequency", &densityFrequency))
+//	if (ImGui::InputFloat("Octave", &densityOctave))
+//		density.setOctave(densityOctave);
+
+	static const char *textureSizesStrings[] = { "512", "1024", "2048", "4096" };
+	static const int textureSizes[] = { 512, 1024, 2048, 4096 };
+	static int currentTextureSize = 0;
+	if (ImGui::Combo("Texture Size", &currentTextureSize, textureSizesStrings,
+			4, -1)) {
+		texturemapper.setTextureSize(textureSizes[currentTextureSize]);
+	}
+
+	if (ImGui::Button("Generate")) {
+		generateAsteroid();
+		uploadMesh();
+	}
+	ImGui::End();
+
+	ImGui::Begin("Rendering");
+	if (ImGui::Button("Reload Shader")) {
+		loadShader();
+		updateVertexArrayObject();
+	}
+	if (ImGui::Button("Wireframe"))
+		glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+	if (ImGui::Button("Fill"))
+		glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+	ImGui::Text("Application average %.3f ms/frame (%.1f FPS)",
+			1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
+	ImGui::End();
+
+	ImGui::Begin("Textures");
+	ImGui::Image((ImTextureID) (intptr_t) tAlbedoId,
+			ImVec2(ImGui::GetWindowContentRegionMax().x,
+					ImGui::GetWindowContentRegionMax().x));
+	ImGui::End();
+}
+
+void Application::run() {
+
+	while (!glfwWindowShouldClose(window)) {
+		glfwPollEvents();
+		glfwGetFramebufferSize(window, &width, &height);
+		ImGui_ImplGlfwGL3_NewFrame();
+
+		gui();
+
+		glViewport(0, 0, width, height);
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+		glEnable(GL_DEPTH_TEST);
+		glDepthFunc(GL_LESS);
+		glEnable(GL_CULL_FACE);
+
+		prepareShader();
+		renderMesh();
+
+		ImGui::Render();
+		glfwSwapBuffers(window);
+
+	}
+}

src/Application.h

@@ -0,0 +1,89 @@
+#pragma once
+
+#include "Density.h"
+#include "Polygoniser.h"
+#include "TextureMapper.h"
+
+#include <glm/mat4x4.hpp>
+#include <glm/vec3.hpp>
+
+#include <string>
+
+
+struct GLFWwindow;
+
+class Application {
+	GLFWwindow* window;
+	int width, height;
+
+	Density density;
+	float densityIsolevel;
+	Polygonizer polygonizer;
+	float textureSize;
+	TextureMapper texturemapper;
+
+	unsigned int vertexArrayId, vPositionId, vTexCoordId, vNormalId,
+			indexBufferId, programId, tAlbedoId, tNormalId, tRoughnessId,
+			tMetalicId;
+
+	int MVPloc, Vloc, Mloc, MVloc, LightPosition_worldspaceloc;
+	int vPositionLoc, vTexCoordLoc, vNormalLoc, tAlbedoLoc, tNormalLoc,
+			tRoughnessLoc, tMetalicLoc;
+
+	std::vector<glm::vec3> vertices;
+	std::vector<glm::vec3> normals;
+	std::vector<glm::vec2> texcoords;
+	std::vector<glm::uvec3> indices;
+
+	size_t meteoridCount;
+	float meteroidMinRadius;
+	float meteroidMaxRadius;
+	int meteroidSizeExponent;
+	float densityFrequency, densityOctave;
+	glm::vec3 densityScale;
+	float resolution;
+
+	float viewDistance;
+
+	glm::mat4 fpsTrafo;
+	bool fpsMode;
+
+	void toogleFpsMode();
+public:
+	Application();
+
+	~Application();
+
+	static Application &instance();
+
+	void init();
+
+	void shutdown();
+
+	void KeyCallback(GLFWwindow* window, int key, int scancode, int action,
+			int mods);
+	void MouseButtonCallback(GLFWwindow* window, int button, int action,
+			int mods);
+	void ScrollCallback(GLFWwindow* window, double xoffset, double yoffset);
+	void CharCallback(GLFWwindow* window, unsigned int c);
+
+	void generateAsteroid();
+
+	bool bindVertexAttrib(unsigned int id, int loc, unsigned int size);
+
+	void updateVertexArrayObject();
+
+	unsigned int loadProgram(const std::string &name);
+
+	void loadShader();
+
+	void uploadMesh();
+
+	void renderMesh();
+
+	void prepareShader();
+
+	void gui();
+
+	void run();
+};

src/Density.h

@@ -27,40 +27,57 @@ class Density {
 	glm::vec3 scale;
 	float scaleFactor;
 	float frequency, octave;
-
+	size_t version;
 public:
 	Density() :
-			scale(1), scaleFactor(4), frequency(2), octave(2) {
+			scale(1.0f), scaleFactor(4), frequency(2), octave(2), version(0) {
 
 	}
 
+	const std::vector<Impact> &getImpacts() {
+		return impacts;
+	}
+
+	size_t getVersion() {
+		return version;
+	}
+
 	void addImpact(Impact &impact) {
 		size_t idx = impacts.size();
 		impacts.push_back(impact);
 		glm::vec3 l = impact.pos - glm::vec3(impact.r);
 		glm::vec3 u = impact.pos + glm::vec3(impact.r);
 		impactTree.Insert(&l.x, &u.x, idx);
+		version++;
 	}
 
 	void setSeed(uint32_t seed) {
 		noise.reseed(seed);
+		impacts.clear();
 	}
 
 	void setScale(const glm::vec3 &scale) {
 		this->scale = scale;
 		scaleFactor = 4.f / std::min(scale.x, std::min(scale.y, scale.z));
+		impacts.clear();
+		version++;
+
 	}
 
 	void setFrequency(float f) {
 		frequency = f;
+		impacts.clear();
+		version++;
 	}
 
 	void setOctave(float o) {
 		octave = o;
+		impacts.clear();
+		version++;
 	}
 
-	float operator()(const glm::vec3 &p) const {
-		if (impacts.size()) {
+	float operator()(const glm::vec3 &p, bool includeImpacts = true) const {
+		if (includeImpacts & impacts.size()) {
 			bool insideImpact = false;
 			impactTree.Search(&p.x, &p.x, [&](int idx) -> bool {
 				if (impacts[idx].contains(p)) {
@@ -82,7 +99,7 @@ public:
 	}
 
 	bool intersectIsolevel(const glm::vec3 &start, const glm::vec3 &end,
-			glm::vec3 &pos, float isolevel, float resolution) {
+			glm::vec3 &pos, float isolevel, float resolution) const {
 		glm::vec3 step = glm::normalize(end - start) * glm::vec3(resolution);
 		size_t nSteps = ceil(glm::length(end - start) / resolution);
 		pos = start;

src/Polygoniser.cpp

@@ -0,0 +1,199 @@
+#include "Polygoniser.h"
+
+#include <functional>
+#include <map>
+
+#include <glm/gtc/epsilon.hpp>
+
+#include <MarchingCube.h>
+
+static const int isocells = 32;
+
+Polygonizer::Polygonizer(Density &density, float isolevel) :
+		density(density), isolevel(isolevel) {
+	updateIsocell();
+}
+
+void Polygonizer::setIsoLevel(float isolevel) {
+	bool needIsocellUpdate = false;
+	if (this->isolevel != isolevel) {
+		this->isolevel = isolevel;
+		needIsocellUpdate = true;
+	}
+	needIsocellUpdate |= (isocellVersion != density.getVersion());
+	if (needIsocellUpdate)
+		updateIsocell();
+}
+
+void Polygonizer::updateIsocell() {
+	isocell.clear();
+	isocell.reserve(isocells * isocells * isocells);
+
+	float step = 1. / isocells;
+	for (size_t ix = 0; ix < isocells; ix++) {
+		float xmin = ix * step;
+		float xmax = xmin + step;
+		for (size_t iy = 0; iy < isocells; iy++) {
+			float ymin = iy * step;
+			float ymax = ymin + step;
+
+			float xyz = density(vec3(xmin, ymin, 0));
+			float Xyz = density(vec3(xmax, ymin, 0));
+			float xYz = density(vec3(xmin, ymax, 0));
+			float XYz = density(vec3(xmax, ymax, 0));
+			bool zAllUnder = (xyz < isolevel) && (Xyz < isolevel)
+					&& (xYz < isolevel) && (XYz < isolevel);
+			bool zAllOver = (xyz > isolevel) && (Xyz > isolevel)
+					&& (xYz > isolevel) && (XYz > isolevel);
+
+			for (size_t iz = 0; iz < isocells; iz++) {
+				float zmin = iz * step;
+				float zmax = zmin + step;
+
+				float xyZ = density(vec3(xmin, ymin, zmax));
+				float XyZ = density(vec3(xmax, ymin, zmax));
+				float xYZ = density(vec3(xmin, ymax, zmax));
+				float XYZ = density(vec3(xmax, ymax, zmax));
+				bool ZAllUnder = (xyZ < isolevel) && (XyZ < isolevel)
+						&& (xYZ < isolevel) && (XYZ < isolevel);
+				bool ZAllOver = (xyZ > isolevel) && (XyZ > isolevel)
+						&& (xYZ > isolevel) && (XYZ > isolevel);
+
+				isocell[ix * isocells * isocells + iy * isocells + iz] =
+						(zAllUnder && ZAllUnder) || (zAllOver && ZAllOver);
+
+				xyz = xyZ;
+				Xyz = XyZ;
+				xYz = xYZ;
+				XYz = XYZ;
+				zAllUnder = ZAllUnder;
+				zAllOver = ZAllOver;
+			}
+		}
+	}
+	isocellVersion = density.getVersion();
+}
+
+void Polygonizer::polygonize(const glm::vec3 lower, const glm::vec3 upper,
+		float resolution) {
+
+	size_t nSteps = 1.f / resolution - 1;
+	size_t nT = 0;
+	for (size_t ix = 0; ix < nSteps; ix++) {
+		double x = (double(ix) + 0.5) * resolution;
+		for (size_t iy = 0; iy < nSteps; iy++) {
+			double y = (double(iy) + 0.5) * resolution;
+			for (size_t iz = 0; iz < nSteps; iz++) {
+				double z = (double(iz) + 0.5) * resolution;
+
+				GRIDCELL gridCell;
+				gridCell.p[0] = vec3(x, y, z);
+				gridCell.p[1] = vec3(x + resolution, y, z);
+				gridCell.p[2] = vec3(x + resolution, y + resolution, z);
+				gridCell.p[3] = vec3(x, y + resolution, z);
+				gridCell.p[4] = vec3(x, y, z + resolution);
+				gridCell.p[5] = vec3(x + resolution, y, z + resolution);
+				gridCell.p[6] = vec3(x + resolution, y + resolution,
+						z + resolution);
+				gridCell.p[7] = vec3(x, y + resolution, z + resolution);
+
+				for (size_t iCell = 0; iCell < 8; iCell++) {
+					gridCell.val[iCell] = density(gridCell.p[iCell]);
+				}
+
+				TRIANGLE tris[6];
+				int nTris = Polygonise(gridCell, isolevel, tris);
+				nT += nTris;
+				for (int iTri = 0; iTri < nTris; iTri++) {
+					vec3 *ps = tris[iTri].p;
+
+					// skip degenerate vertices
+					if (all(epsilonEqual(ps[0], ps[1], 1e-8f))
+							|| all(epsilonEqual(ps[0], ps[2], 1e-8f))
+							|| all(epsilonEqual(ps[2], ps[1], 1e-8f)))
+						continue;
+
+					glm::uvec3 idc;
+					for (size_t k = 0; k < 3; k++) {
+						glm::vec3 &p = tris[iTri].p[k];
+						std::map<glm::vec3, int>::iterator vit =
+								vertexLookup.find(p);
+						if (vit != vertexLookup.end()) {
+							idc[k] = vit->second;
+						} else {
+							idc[k] = vertices.size();
+							vertices.push_back(p);
+							vertexLookup[p] = idc[k];
+						}
+					}
+					indices.push_back(idc);
+				}
+			}
+		}
+	}
+}
+
+void Polygonizer::polygonize(float resolution) {
+	vertexLookup.clear();
+	vertices.clear();
+	indices.clear();
+
+// coarse scan
+	float coarseResolution = resolution * 10;
+
+	size_t nSteps = 1.f / resolution - 1;
+	size_t nT = 0;
+	for (size_t ix = 0; ix < nSteps; ix++) {
+		double x = (double(ix) + 0.5) * resolution;
+		for (size_t iy = 0; iy < nSteps; iy++) {
+			double y = (double(iy) + 0.5) * resolution;
+			for (size_t iz = 0; iz < nSteps; iz++) {
+				double z = (double(iz) + 0.5) * resolution;
+
+				GRIDCELL gridCell;
+				gridCell.p[0] = vec3(x, y, z);
+				gridCell.p[1] = vec3(x + resolution, y, z);
+				gridCell.p[2] = vec3(x + resolution, y + resolution, z);
+				gridCell.p[3] = vec3(x, y + resolution, z);
+				gridCell.p[4] = vec3(x, y, z + resolution);
+				gridCell.p[5] = vec3(x + resolution, y, z + resolution);
+				gridCell.p[6] = vec3(x + resolution, y + resolution,
+						z + resolution);
+				gridCell.p[7] = vec3(x, y + resolution, z + resolution);
+
+				for (size_t iCell = 0; iCell < 8; iCell++) {
+					gridCell.val[iCell] = density(gridCell.p[iCell]);
+				}
+
+				TRIANGLE tris[6];
+				int nTris = Polygonise(gridCell, isolevel, tris);
+				nT += nTris;
+				for (int iTri = 0; iTri < nTris; iTri++) {
+					vec3 *ps = tris[iTri].p;
+
+					// skip degenerate vertices
+					if (all(epsilonEqual(ps[0], ps[1], 1e-8f))
+							|| all(epsilonEqual(ps[0], ps[2], 1e-8f))
+							|| all(epsilonEqual(ps[2], ps[1], 1e-8f)))
+						continue;
+
+					glm::uvec3 idc;
+					for (size_t k = 0; k < 3; k++) {
+						glm::vec3 &p = tris[iTri].p[k];
+						std::map<glm::vec3, int>::iterator vit =
+								vertexLookup.find(p);
+						if (vit != vertexLookup.end()) {
+							idc[k] = vit->second;
+						} else {
+							idc[k] = vertices.size();
+							vertices.push_back(p);
+							vertexLookup[p] = idc[k];
+						}
+					}
+					indices.push_back(idc);
+				}
+			}
+		}
+	}
+
+}

src/Polygoniser.h

@@ -1,14 +1,9 @@
 #pragma once
 
-#include <functional>
 #include <vector>
 #include <map>
 
 #include <glm/vec3.hpp>
-#include <glm/gtc/epsilon.hpp>
-
-#include <MarchingCube.h>
-#include <logger.h>
 
 #include "Density.h"
 
@@ -39,79 +34,22 @@ struct CompareVec3 {
 };
 
 class Polygonizer {
+	Density &density;
+	float isolevel;
 public:
 	std::vector<glm::vec3> vertices;
-	std::vector<glm::uvec3> triangles;
-
-	Density &density;
-
-	Polygonizer(Density &density) :
-			density(density) {
-
-	}
-
-	void polygonize(float isolevel, float resolution) {
-		vertices.clear();
-		triangles.clear();
-
+	std::vector<glm::uvec3> indices;
 	std::map<glm::vec3, int, CompareVec3> vertexLookup;
 
-		size_t nSteps = 1.f / resolution - 1;
-		size_t nT = 0;
-		for (size_t ix = 0; ix < nSteps; ix++) {
-			double x = (double(ix) + 0.5) * resolution;
-			for (size_t iy = 0; iy < nSteps; iy++) {
-				double y = (double(iy) + 0.5) * resolution;
-				for (size_t iz = 0; iz < nSteps; iz++) {
-					double z = (double(iz) + 0.5) * resolution;
+	std::vector<bool> isocell;
+	size_t isocellVersion;
 
-					GRIDCELL gridCell;
-					gridCell.p[0] = vec3(x, y, z);
-					gridCell.p[1] = vec3(x + resolution, y, z);
-					gridCell.p[2] = vec3(x + resolution, y + resolution, z);
-					gridCell.p[3] = vec3(x, y + resolution, z);
-					gridCell.p[4] = vec3(x, y, z + resolution);
-					gridCell.p[5] = vec3(x + resolution, y, z + resolution);
-					gridCell.p[6] = vec3(x + resolution, y + resolution,
-							z + resolution);
-					gridCell.p[7] = vec3(x, y + resolution, z + resolution);
+	Polygonizer(Density &density, float isolevel);
+	void setIsoLevel(float isolevel);
 
-					for (size_t iCell = 0; iCell < 8; iCell++) {
-						gridCell.val[iCell] = density(gridCell.p[iCell]);
-					}
-
-					TRIANGLE tris[6];
-					int nTris = Polygonise(gridCell, isolevel, tris);
-					nT += nTris;
-					for (int iTri = 0; iTri < nTris; iTri++) {
-						vec3 *ps = tris[iTri].p;
-
-						// skip degenerate vertices
-						if (all(epsilonEqual(ps[0], ps[1], 1e-8f))
-								|| all(epsilonEqual(ps[0], ps[2], 1e-8f))
-								|| all(epsilonEqual(ps[2], ps[1], 1e-8f)))
-							continue;
-
-						glm::uvec3 idc;
-						for (size_t k = 0; k < 3; k++) {
-							glm::vec3 &p = tris[iTri].p[k];
-							std::map<glm::vec3, int>::iterator vit =
-									vertexLookup.find(p);
-							if (vit != vertexLookup.end()) {
-								idc[k] = vit->second;
-							} else {
-								idc[k] = vertices.size();
-								vertices.push_back(p);
-								vertexLookup[p] = idc[k];
-							}
-						}
-						triangles.push_back(idc);
-					}
-				}
-			}
-		}
-
-
-	}
+	void updateIsocell();
 
+	void polygonize(float resolution);
+	void polygonize(const glm::vec3 lower, const glm::vec3 upper,
+			float isolevel);
 };

src/TextureMapper.cpp

@@ -0,0 +1,205 @@
+#include "TextureMapper.h"
+
+#include <glm/mat3x3.hpp>
+
+#include "stb_image_write.h"
+
+#include <iostream>
+
+TextureMapper::TextureMapper(Density &density, size_t textureSize) :
+		density(density), textureSize(textureSize), albedo(
+				textureSize * textureSize), normal(textureSize * textureSize), roughness(
+				textureSize * textureSize), darkestColor(0.3, 0.25, 0.2), brightestColor(
+				0.9, 0.85, 0.8) {
+
+}
+void TextureMapper::setTextureSize(size_t size) {
+	textureSize = size;
+	albedo.resize(textureSize * textureSize);
+	normal.resize(textureSize * textureSize);
+	roughness.resize(textureSize * textureSize);
+}
+
+size_t TextureMapper::getTextureSize() {
+	return textureSize;
+}
+
+void TextureMapper::map(const vec3v_t &inVertices, const vec3v_t &inNormals,
+		const uvec3v_t &inIndices) {
+	float texf = 1. / textureSize;
+
+	vertices.clear();
+	vertices.reserve(inIndices.size() * 3);
+	normals.clear();
+	normals.reserve(inIndices.size() * 3);
+	texcoords.clear();
+	texcoords.reserve(inIndices.size() * 3);
+
+	int rects = ceil(sqrt(inIndices.size())), rx = 0, ry = 0;
+	float rectSize = floor(float(textureSize) / rects) / textureSize;
+	for (size_t i = 0; i != inIndices.size(); i++) {
+		glm::vec3 p[3], n[3];
+		glm::uvec3 idx = inIndices[i];
+		indices.push_back(
+				glm::uvec3(vertices.size(), vertices.size() + 1,
+						vertices.size() + 2));
+		for (size_t j = 0; j < 3; j++) {
+			p[j] = inVertices[idx[j]];
+			vertices.push_back(p[j]);
+			n[j] = inNormals[idx[j]];
+			normals.push_back(n[j]);
+		}
+
+		glm::vec3 ex = glm::normalize(p[1] - p[0]);
+		glm::vec3 ey = glm::normalize(glm::cross(ex, p[2] - p[0]));
+		glm::vec3 ez = glm::normalize(glm::cross(ex, ey));
+		glm::mat3 base = glm::mat3(ex, ey, ez);
+		glm::vec3 t[3] = { p[0] * base, p[1] * base, p[2] * base };
+		glm::vec3 lower = min(min(t[0], t[1]), t[2]);
+		glm::vec3 upper = max(max(t[0], t[1]), t[2]);
+		t[0] -= lower;
+		t[1] -= lower;
+		t[2] -= lower;
+		glm::vec3 extent = upper - lower;
+		float s = std::max(std::max(extent.x, extent.y), extent.z);
+		t[0] *= 0.8 * rectSize / s;
+		t[1] *= 0.8 * rectSize / s;
+		t[2] *= 0.8 * rectSize / s;
+		glm::vec3 off(rx * rectSize, 0, ry * rectSize);
+		t[0] += off;
+		t[1] += off;
+		t[2] += off;
+		texcoords.push_back(glm::vec2(t[0].x, t[0].z));
+		texcoords.push_back(glm::vec2(t[1].x, t[1].z));
+		texcoords.push_back(glm::vec2(t[2].x, t[2].z));
+
+		//if (rx == 0 && ry == 0) {
+		t[0].y = 0;
+		t[1].y = 0;
+		t[2].y = 0;
+//			cout << "ftex " << texf << endl;
+//			cout << "t[0]  " << t[0].x << " " << t[0].z << endl;
+//			cout << "t[1]  " << t[1].x << " " << t[1].z << endl;
+//			cout << "t[2]  " << t[2].x << " " << t[2].z << endl;
+//			cout << "t[0]p " << t[0].x * ntex << " " << (1 - t[0].z) * ntex << endl;
+//			cout << "t[1]p " << t[1].x * ntex << " " << (1 - t[1].z) * ntex << endl;
+//			cout << "t[2]p " << t[2].x * ntex << " " << (1 - t[2].z) * ntex << endl;
+		// fill texture
+		// fill whole rect for now
+		int rpix = floor(rectSize * textureSize);
+
+		glm::vec3 eb = t[1] - t[0];
+		float leb = glm::length(eb);
+		glm::vec3 ec = t[2] - t[0];
+		float lec = glm::length(ec);
+//		mat2 textureBase = mat2(vec2(eb.x, eb.z), vec2(ec.x, ec.z));
+//		mat2 itextureBase = inverse(textureBase);
+		glm::mat3 textureBase = glm::mat3(eb, glm::cross(eb, ec), ec);
+		glm::mat3 itextureBase = glm::inverse(textureBase);
+
+//		eb = normalize(eb);
+//		ec = normalize(ec);
+
+		glm::vec3 db = p[1] - p[0];
+		glm::vec3 dc = p[2] - p[0];
+
+		glm::vec3 mb = glm::normalize(p[1] - p[0]);
+		glm::vec3 mc = glm::normalize(p[2] - p[0]);
+//		mat2 faceBase = mat2(vec2(mb.x, mb.z), vec2(mc.x, mc.z));
+//		mat2 ifaceBase = inverse(faceBase);
+
+		glm::mat3 faceBase = glm::mat3(db, glm::cross(db, dc), dc);
+		glm::mat3 ifaceBase = glm::inverse(faceBase);
+
+		glm::vec3 tmin = max(
+				floor(
+						min(min(t[0], t[1]), t[2])
+								* glm::vec3((float) textureSize))
+						- glm::vec3(1.0f), glm::vec3(0.1));
+		glm::vec3 tmax = min(
+				ceil(
+						max(max(t[0], t[1]), t[2])
+								* glm::vec3((float) textureSize))
+						+ glm::vec3(1.0f), glm::vec3(textureSize-1));
+
+		// TODO: borders!
+		for (int ix = tmin.x; ix < tmax.x; ix++) {
+			for (int iy = (textureSize - tmax.z); iy < (textureSize - tmin.z);
+					iy++) {
+
+				// https://stackoverflow.com/questions/2049582/how-to-determine-if-a-point-is-in-a-2d-triangle#2049593
+
+//				for (int iy = tmin.z; iy < tmax.z; iy++) {
+
+//					cout << "pix " << ix << " " << iy << endl;
+//					cout << "uv  " << float(ix) * texf << " " << 1.f - float(iy) * texf << endl;
+
+				// pixel to uv space
+				glm::vec3 res = glm::vec3(float(ix) * texf, 0.f,
+						1.f - float(iy) * texf) - t[0];
+				// cout << "r   = " << r.x << " " << r.y << endl;
+				glm::vec3 local = faceBase * itextureBase * res;
+
+				// cout << "res = " << res.x << " " << res.y << endl;
+//				vec2 res = ifaceBase * textureBase * r * faceBase;
+				//
+//				cout << "pix " << ix << " " << res.x << " " << res.y << " " << res.z << endl;
+//				float fb = dot(r, eb) / leb;
+//				float fc = dot(r, ec) / lec;
+				glm::vec3 sp = p[0] + local; //res.x * mb + res.y * mc;
+				float v = (float) density(sp, false);
+//
+				//v = pow(v, 3);
+				// default color
+//					float r = 0.8 + v * 0.2, g = 0.75 + 0.2 * v, b = 0.7
+//							+ 0.2 * v;
+
+				glm::vec3 rgb = glm::vec3(255)
+						* glm::mix(darkestColor, brightestColor, v);
+				albedo[ix + (textureSize - iy) * textureSize][0] = rgb.x;
+				albedo[ix + (textureSize - iy) * textureSize][1] = rgb.y;
+				albedo[ix + (textureSize - iy) * textureSize][2] = rgb.z;
+
+//				diff[ix + iy * ntex] = v * 255;
+//				diff[ix + iy * ntex][0] = (32 * rx) % 255;
+//				diff[ix + iy * ntex][1] = (32 * ry) % 255;
+//				diff[ix + iy * ntex][2] = 0; //(0.5 + sp.z) * 255;
+
+//				float rd = 1.f; //0.7 + 0.3 * length(r) * rects;
+//				albedo[ix + iy * textureSize][0] = rd * (0.5 + sp.x) * 255;
+//				albedo[ix + iy * textureSize][1] = rd * (0.5 + sp.y) * 255;
+//				albedo[ix + iy * textureSize][2] = rd * (0.5 + sp.z) * 255;
+
+//					albedo[ix + iy * textureSize][0] = length(res) * rects * 255;
+//					albedo[ix + iy * textureSize][1] = length(res) * rects * 255;
+//					albedo[ix + iy * textureSize][2] = length(res) * rects * 255;
+
+//									diff[ix + iy * ntex][0] = r.x * rects * 200;
+//									diff[ix + iy * ntex][1] = -r.z * rects * 200;
+//									diff[ix + iy * ntex][2] = 0;
+
+//													diff[ix + iy * ntex][0] = 128 + (res.x - 0.5) * 200;
+//													diff[ix + iy * ntex][1] = 128 + (res.y - 0.5) * 200;
+//													diff[ix + iy * ntex][2] = 0; //res.z * 255;
+
+			}
+			//}
+		}
+		rx++;
+		if (rx >= rects) {
+			rx = 0;
+			ry++;
+		}
+
+	}
+//
+//	for (int ix = 0; ix < ntex; ix++) {
+//		for (int iy = 0; iy < ntex; iy++) {
+//
+//			float v = (float) noise.octaveNoise0_1(ix * texf * frequency,
+//					iy * texf * frequency, 0.5 * frequency, 4);
+//			diff[ix + (ntex - iy) * ntex] = 5 + v * 250;
+//		}
+//	}
+	stbi_write_png("albedo.png", textureSize, textureSize, 3, albedo.data(), 0);
+}

src/TextureMapper.h

@@ -1,201 +1,38 @@
-#ifndef SRC_TEXTUREMAPPER_H_
-#define SRC_TEXTUREMAPPER_H_
+#pragma once
+
+#include "Density.h"
 
 #include <vector>
 #include <glm/vec3.hpp>
 
 class TextureMapper {
-public:
-	typedef std::vector<glm::uint8[3]> texture3_t;
-	typedef std::vector<uint8_t> texture1_t;
-	texture3_t diffuse;
-	texture3_t normal;
-	texture1_t roughness;
 	size_t textureSize;
 
-	TextureMapper(size_t textureSize) :
-			textureSize(textureSize), diffuse(textureSize * textureSize), normal(
-					textureSize * textureSize), roughness(
-					textureSize * textureSize) {
+public:
+	typedef std::vector< glm::tvec3<uint8_t> > texture3_t;
+	typedef std::vector<uint8_t> texture1_t;
+	typedef std::vector<glm::vec3> vec3v_t;
+	typedef std::vector<glm::vec2> vec2v_t;
+	typedef std::vector<glm::uvec3> uvec3v_t;
 
-	}
+	Density &density;
 
-	void map() {
-		cout << "Stage4: UV map" << endl;
-		TriMesh mappedMesh;
-		float texf = 1. / texture_size;
+	texture3_t albedo;
+	texture3_t normal;
+	texture1_t roughness;
+	texture1_t metalness;
 
-		mesh.request_vertex_normals();
-		mesh.request_face_normals();
-		mesh.update_face_normals();
-		mesh.update_vertex_normals();
-		int rects = ceil(sqrt(mesh.n_faces())), rx = 0, ry = 0;
-		float rectSize = floor(float(texture_size) / rects) / texture_size;
-		size_t nfaces = mesh.n_faces(), iface = 0;
-		for (auto i = mesh.faces_begin(); i != mesh.faces_end(); i++) {
-			if (show_progress)
-				(cout << "\r  " << int(100. * float(iface++) / nfaces) << "%").flush();
+	vec3v_t vertices;
+	vec3v_t normals;
+	vec2v_t texcoords;
+	uvec3v_t indices;
 
-			vec3 p[3], n[3];
-			int k = 0;
-			TriMesh::VertexHandle h[3];
-			for (auto j = mesh.fv_begin(*i); j != mesh.fv_end(*i); j++) {
-				if (!j->is_valid())
-					cout << "invalid vertex" << endl;
-				TriMesh::Point pt = mesh.point(*j);
-				p[k] = vec3(pt[0], pt[1], pt[2]);
-				TriMesh::Normal nm = mesh.calc_vertex_normal(*j);
-				n[k] = vec3(nm[0], nm[1], nm[2]);
-				h[k] = mappedMesh.add_vertex(pt);
-				mappedMesh.set_normal(h[k], nm);
-				k++;
-				if (k > 3)
-					cout << "not a triangle!" << endl;
-			}
-			mappedMesh.add_face(h, 3);
+	glm::vec3 darkestColor, brightestColor;
 
-			vec3 ex = normalize(p[1] - p[0]);
-			vec3 ey = normalize(cross(ex, p[2] - p[0]));
-			vec3 ez = normalize(cross(ex, ey));
-			mat3 base = mat3(ex, ey, ez);
-			vec3 t[3] = { p[0] * base, p[1] * base, p[2] * base };
-			vec3 lower = min(min(t[0], t[1]), t[2]);
-			vec3 upper = max(max(t[0], t[1]), t[2]);
-			t[0] -= lower;
-			t[1] -= lower;
-			t[2] -= lower;
-			vec3 extent = upper - lower;
-			float s = std::max(std::max(extent.x, extent.y), extent.z);
-			t[0] *= 0.8 * rectSize / s;
-			t[1] *= 0.8 * rectSize / s;
-			t[2] *= 0.8 * rectSize / s;
-			vec3 off(rx * rectSize, 0, ry * rectSize);
-			t[0] += off;
-			t[1] += off;
-			t[2] += off;
-			mappedMesh.set_texcoord2D(h[0],
-					TriMesh::TexCoord2D(t[0].x, t[0].z));
-			mappedMesh.set_texcoord2D(h[1],
-					TriMesh::TexCoord2D(t[1].x, t[1].z));
-			mappedMesh.set_texcoord2D(h[2],
-					TriMesh::TexCoord2D(t[2].x, t[2].z));
+	TextureMapper(Density &density, size_t textureSize);
 
-			//if (rx == 0 && ry == 0) {
-			t[0].y = 0;
-			t[1].y = 0;
-			t[2].y = 0;
-//			cout << "ftex " << texf << endl;
-//			cout << "t[0]  " << t[0].x << " " << t[0].z << endl;
-//			cout << "t[1]  " << t[1].x << " " << t[1].z << endl;
-//			cout << "t[2]  " << t[2].x << " " << t[2].z << endl;
-//			cout << "t[0]p " << t[0].x * ntex << " " << (1 - t[0].z) * ntex << endl;
-//			cout << "t[1]p " << t[1].x * ntex << " " << (1 - t[1].z) * ntex << endl;
-//			cout << "t[2]p " << t[2].x * ntex << " " << (1 - t[2].z) * ntex << endl;
-			// fill texture
-			// fill whole rect for now
-			int rpix = floor(rectSize * texture_size);
-
-			vec3 eb = t[1] - t[0];
-			float leb = length(eb);
-			vec3 ec = t[2] - t[0];
-			float lec = length(ec);
-//		mat2 textureBase = mat2(vec2(eb.x, eb.z), vec2(ec.x, ec.z));
-//		mat2 itextureBase = inverse(textureBase);
-			mat3 textureBase = mat3(eb, cross(eb, ec), ec);
-			mat3 itextureBase = inverse(textureBase);
-
-//		eb = normalize(eb);
-//		ec = normalize(ec);
-
-			vec3 db = p[1] - p[0];
-			vec3 dc = p[2] - p[0];
-
-			vec3 mb = normalize(p[1] - p[0]);
-			vec3 mc = normalize(p[2] - p[0]);
-//		mat2 faceBase = mat2(vec2(mb.x, mb.z), vec2(mc.x, mc.z));
-//		mat2 ifaceBase = inverse(faceBase);
-
-			mat3 faceBase = mat3(db, cross(db, dc), dc);
-			mat3 ifaceBase = inverse(faceBase);
-
-			// mat2 trafo = ifaceBase * textureBase * faceBase;
-
-			for (int ix = rx * rpix; ix < (rx + 1) * rpix; ix++) {
-				for (int iy = (texture_size - (ry + 1) * rpix);
-						iy < (texture_size - ry * rpix); iy++) {
-
-//					cout << "pix " << ix << " " << iy << endl;
-//					cout << "uv  " << float(ix) * texf << " " << 1.f - float(iy) * texf << endl;
-
-					// pixel to uv space
-					vec3 res = vec3(float(ix) * texf, 0.f,
-							1.f - float(iy) * texf) - t[0];
-					// cout << "r   = " << r.x << " " << r.y << endl;
-					res = faceBase * itextureBase * res;
-
-					// cout << "res = " << res.x << " " << res.y << endl;
-//				vec2 res = ifaceBase * textureBase * r * faceBase;
-					//
-//				cout << "pix " << ix << " " << res.x << " " << res.y << " " << res.z << endl;
-//				float fb = dot(r, eb) / leb;
-//				float fc = dot(r, ec) / lec;
-					vec3 sp = p[0] + res; //res.x * mb + res.y * mc;
-					float v = (float) noise.octaveNoise0_1(sp.x * frequency * 4,
-							sp.y * frequency * 4, sp.z * frequency * 4, 8);
-//
-					v = pow(v, 3);
-					// default color
-					float r = 0.12 + v * 0.72, g = 0.1 + 0.7 * v, b = 0.1
-							+ 0.7 * v;
-
-					diff[ix + iy * texture_size][0] = r * 255;
-					diff[ix + iy * texture_size][1] = g * 255;
-					diff[ix + iy * texture_size][2] = b * 255;
-
-//				diff[ix + iy * ntex] = v * 255;
-//				diff[ix + iy * ntex][0] = (32 * rx) % 255;
-//				diff[ix + iy * ntex][1] = (32 * ry) % 255;
-//				diff[ix + iy * ntex][2] = 0; //(0.5 + sp.z) * 255;
-
-//				float rd = 1.f; //0.7 + 0.3 * length(r) * rects;
-//				diff[ix + iy * ntex][0] = rd * (0.5 + sp.x) * 255;
-//				diff[ix + iy * ntex][1] = rd * (0.5 + sp.y) * 255;
-//				diff[ix + iy * ntex][2] = rd * (0.5 + sp.z) * 255;
-
-//					diff[ix + iy * ntex][0] = length(r) * rects * 255;
-//					diff[ix + iy * ntex][1] = length(r) * rects * 255;
-//					diff[ix + iy * ntex][2] = length(r) * rects * 255;
-
-//									diff[ix + iy * ntex][0] = r.x * rects * 200;
-//									diff[ix + iy * ntex][1] = -r.z * rects * 200;
-//									diff[ix + iy * ntex][2] = 0;
-
-//													diff[ix + iy * ntex][0] = 128 + (res.x - 0.5) * 200;
-//													diff[ix + iy * ntex][1] = 128 + (res.y - 0.5) * 200;
-//													diff[ix + iy * ntex][2] = 0; //res.z * 255;
-
-				}
-				//}
-			}
-			rx++;
-			if (rx >= rects) {
-				rx = 0;
-				ry++;
-			}
-
-		}
-//
-//	for (int ix = 0; ix < ntex; ix++) {
-//		for (int iy = 0; iy < ntex; iy++) {
-//
-//			float v = (float) noise.octaveNoise0_1(ix * texf * frequency,
-//					iy * texf * frequency, 0.5 * frequency, 4);
-//			diff[ix + (ntex - iy) * ntex] = 5 + v * 250;
-//		}
-//	}
-		stbi_write_bmp("diffuse.bmp", texture_size, texture_size, 3,
-				diff.data());
-	}
+	void setTextureSize(size_t size);
+	size_t getTextureSize();
+	void map(const vec3v_t &inVertices, const vec3v_t &inNormals,
+			const uvec3v_t &inIndices);
 };
-
-#endif /* SRC_TEXTUREMAPPER_H_ */

src/main.cpp

@@ -1,385 +1,7 @@
-#include "Density.h"
-#include "Polygoniser.h"
-
-#include <glad/glad.h>
-#include <GLFW/glfw3.h>
-#include <glm/mat4x4.hpp>
-#include <glm/gtc/matrix_transform.hpp>
-#include <imgui.h>
-#include <imgui_impl_glfw_gl3.h>
-
-#include <stdlib.h>
-#include <stdio.h>
-
-#include <iostream>
-#include <fstream>
-
-static bool glck(const char* call) {
-	int err = glGetError();
-	if (err == 0) {
-		return true;
-	} else {
-		switch (err) {
-		case GL_INVALID_VALUE:
-			printf("GL_INVALID_VALUE: %s\n", call);
-			break;
-		case GL_INVALID_ENUM:
-			printf("GL_INVALID_ENUM: %s\n", call);
-			break;
-		case GL_INVALID_OPERATION:
-			printf("GL_INVALID_OPERATION: %s\n", call);
-			break;
-		default:
-			printf("UNKNOWN Error: %s\n", call);
-		}
-		return false;
-	}
-}
-
-#define GLCK(a) {a; assert(glck(#a));}
-
-// ! https://learnopengl.com/#!PBR/Lighting
-
-static const char* vertex_shader_text = "#version 130\n"
-		"uniform mat4 MVP;\n"
-		"in vec3 vPos;\n"
-		"in vec3 vNorm;\n"
-		"out vec3 normal;\n"
-		"void main()\n"
-		"{\n"
-		"    gl_Position = MVP * vec4(vPos, 1.0);\n"
-		"    normal = normalize(vNorm);\n"
-		"}\n";
-
-static const char* fragment_shader_text = "#version 130\n"
-		"in vec3 normal;\n"
-		"out vec4 color;\n"
-		"void main()\n"
-		"{\n"
-		"    color = normal.y * vec4(1.0, 0.95, 0.9, 1.0);\n"
-		"}\n";
-static void error_callback(int error, const char* description) {
-	fprintf(stderr, "Error: %s\n", description);
-}
-static void key_callback(GLFWwindow* window, int key, int scancode, int action,
-		int mods) {
-	if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
-		glfwSetWindowShouldClose(window, GLFW_TRUE);
-}
-
-void checkShader(GLuint vertexShader, const std::string &name) {
-	GLint status;
-	glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &status);
-
-	if (status == GL_FALSE) {
-
-		std::cout << "Shader '" << name << "' compiled with an error(s):"
-				<< std::endl;
-		char buffer[512];
-		int l;
-		glGetShaderInfoLog(vertexShader, 512, &l, buffer);
-		buffer[l] = 0;
-		std::cout << buffer << std::endl;
-	}
-}
-
-void checkProgam(GLuint vertexShader, const std::string &name) {
-	GLint status;
-	glGetProgramiv(vertexShader, GL_LINK_STATUS, &status);
-
-	if (status == GL_FALSE) {
-
-		std::cout << "Program '" << name << "' failed with an error(s):"
-				<< std::endl;
-		char buffer[512];
-		int l;
-		glGetProgramInfoLog(vertexShader, 512, &l, buffer);
-		buffer[l] = 0;
-		std::cout << buffer << std::endl;
-	}
-}
-
-void calculateNormals(const std::vector<glm::vec3> &vtx,
-		std::vector<glm::uvec3> &tri, std::vector<glm::vec3> &normals) {
-	normals.clear();
-	normals.resize(vtx.size(), glm::vec3(0));
-	for (size_t i = 0; i < tri.size(); i++) {
-		int a = tri[i].x, b = tri[i].y, c = tri[i].z;
-		glm::vec3 faceNormal = normalize(
-				glm::cross(vtx[b] - vtx[a], vtx[c] - vtx[a]));
-		normals[a] += faceNormal;
-		normals[b] += faceNormal;
-		normals[c] += faceNormal;
-	}
-	for (size_t i = 0; i < normals.size(); i++)
-		normals[i] = glm::normalize(normals[i]);
-
-}
-
-void moveToMean(std::vector<glm::vec3> &vtx) {
-	glm::vec3 mean(0);
-	for (size_t i = 0; i < vtx.size(); i++) {
-		mean += vtx[i];
-	}
-	mean *= glm::vec3(1.f / vtx.size());
-	for (size_t i = 0; i < vtx.size(); i++) {
-		vtx[i] -= mean;
-	}
-}
-
-void smooth(std::vector<glm::vec3> &vtx, const std::vector<glm::uvec3> &tri) {
-	std::vector<glm::vec3> cogs(vtx.size(), glm::vec3(0.f));
-	std::vector<int> valence(vtx.size(), 0);
-
-	for (size_t iTri = 0; iTri < tri.size(); iTri++) {
-		const glm::uvec3 &idx = tri[iTri];
-		for (size_t iE = 0; iE < 3; iE++) {
-			valence[idx[iE]] += 2;
-			cogs[idx[iE]] += vtx[idx[(iE + 1) % 3]];
-			cogs[idx[iE]] += vtx[idx[(iE + 2) % 3]];
-		}
-	}
-	/*
-	 for (v_it = mesh.vertices_begin(); v_it != v_end; ++v_it) {
-	 cog[0] = cog[1] = cog[2] = valence = 0.0;
-
-	 for (vv_it = mesh.vv_iter(*v_it); vv_it.is_valid(); ++vv_it) {
-	 cog += mesh.point(*vv_it);
-	 ++valence;
-	 }
-	 cogs.push_back(cog / valence);
-	 }
-	 for (v_it = mesh.vertices_begin(), cog_it = cogs.begin(); v_it != v_end;
-	 ++v_it, ++cog_it)
-	 if (!mesh.is_boundary(*v_it))
-	 mesh.set_point(*v_it, *cog_it);
-
-	 */
-	for (size_t i = 0; i < vtx.size(); i++) {
-//		vtx[i] = vtx[i] * glm::vec3(0.8)
-//				+ cogs[i] * glm::vec3(0.2f / valence[i]);
-		vtx[i] = cogs[i] * glm::vec3(1.f / valence[i]);
-	}
-}
-
-void saveAttrib(std::ostream &out, const char *prefix,
-		std::vector<glm::vec3> &elements) {
-	for (size_t i = 0; i < elements.size(); i++) {
-		out << prefix << elements[i].x << " " << elements[i].y << " " << elements[i].z
-				<< "\n";
-	}
-}
-
-void saveAttrib(std::ostream &out, const char *prefix,
-		std::vector<glm::vec2> &elements) {
-	for (size_t i = 0; i < elements.size(); i++) {
-		out << prefix << elements[i].x << " " << elements[i].y << "\n";
-	}
-}
-
-void saveFaces(std::ostream &out, const std::vector<glm::uvec3> &tris, size_t attribs) {
-	for (size_t i = 0; i < tris.size(); i++) {
-		out << "f";
-
-		for (size_t j = 0; j < 3; j++) {
-			int v = tris[i][j] + 1;
-			out << " " << v;
-			if (attribs > 1)
-				out << "/" << v;
-			if (attribs > 2)
-				out << "/" << v;
-			out << " ";
-		}
-
-		out << "\n";
-	}
-}
-
-void calculateEdges(const std::vector<glm::vec3> &vtx,
-		std::vector<glm::uvec3> &tri, std::vector<glm::vec4> &edges) {
-	edges.clear();
-}
+#include "Application.h"
 
 int main(void) {
 
-	std::srand(123);
+	Application::instance().run();
 
-	Density density;
-	density.addRandomImpacts(1000, 0.2, 0.01, 0.005, 0.2, 4096);
-	//density.saveCrossSection("density.png", 512);
-
-	Polygonizer polygonizer(density);
-	polygonizer.polygonize(0.2, 1. / 20.);
-
-	moveToMean(polygonizer.vertices);
-	{
-		std::ofstream out("stage1.obj");
-		saveAttrib(out, "v ", polygonizer.vertices);
-		saveFaces(out, polygonizer.triangles, 1);
-	}
-	smooth(polygonizer.vertices, polygonizer.triangles);
-	{
-		std::ofstream out("stage2.obj");
-		saveAttrib(out, "v ", polygonizer.vertices);
-		saveFaces(out, polygonizer.triangles, 1);
-	}
-	std::vector<glm::vec3> normals;
-	calculateNormals(polygonizer.vertices, polygonizer.triangles, normals);
-	{
-		std::ofstream out("stage3.obj");
-		saveAttrib(out, "v ", polygonizer.vertices);
-		saveAttrib(out, "vn ", normals);
-		saveFaces(out, polygonizer.triangles, 2);
-	}
-
-	std::vector<glm::uvec4> edges;
-	std::cout << "Vertices: " << polygonizer.vertices.size() << std::endl;
-	std::cout << "Triangles: " << polygonizer.triangles.size() << std::endl;
-
-	GLFWwindow* window;
-	GLuint vertex_array, vertex_buffer, index_buffer, normal_buffer,
-			vertex_shader, fragment_shader, program;
-	GLint mvp_location, vpos_location, vnorm_location;
-
-	glfwSetErrorCallback(error_callback);
-
-	if (!glfwInit())
-		exit(EXIT_FAILURE);
-
-//	glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
-	//glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_COMPAT_PROFILE);
-	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
-	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
-
-	window = glfwCreateWindow(640, 480, "Simple example", NULL, NULL);
-	if (!window) {
-		glfwTerminate();
-		exit(EXIT_FAILURE);
-	}
-
-	glfwSetKeyCallback(window, key_callback);
-
-	glfwMakeContextCurrent(window);
-	gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
-	glfwSwapInterval(1);
-
-	std::cout << "OpenGL version: " << glGetString(GL_VERSION) << std::endl;
-	std::cout << "GLSL version: " << glGetString(GL_SHADING_LANGUAGE_VERSION)
-			<< std::endl;
-	std::cout << "Vendor: " << glGetString(GL_VENDOR) << std::endl;
-	std::cout << "Renderer: " << glGetString(GL_RENDERER) << std::endl;
-
-	// NOTE: OpenGL error checks have been omitted for brevity
-
-//	    glGenBuffers(1, &vertex_buffer);
-//	    glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
-//	    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
-
-	GLCK(glGenVertexArrays(1, &vertex_array))
-	GLCK(glBindVertexArray(vertex_array))
-
-	GLCK(glGenBuffers(1, &vertex_buffer))
-	GLCK(glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer))
-	GLCK(
-			glBufferData(GL_ARRAY_BUFFER, polygonizer.vertices.size() * sizeof(glm::vec3), polygonizer.vertices.data(), GL_STATIC_DRAW))
-
-	GLCK(glGenBuffers(1, &index_buffer))
-	GLCK(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, index_buffer))
-	GLCK(
-			glBufferData(GL_ELEMENT_ARRAY_BUFFER, polygonizer.triangles.size() * sizeof(glm::uvec3), polygonizer.triangles.data(), GL_STATIC_DRAW))
-
-	GLCK(glGenBuffers(1, &normal_buffer))
-	GLCK(glBindBuffer(GL_ARRAY_BUFFER, normal_buffer))
-	GLCK(
-			glBufferData(GL_ARRAY_BUFFER, normals.size() * sizeof(glm::vec3), normals.data(), GL_STATIC_DRAW))
-
-	GLCK(vertex_shader = glCreateShader(GL_VERTEX_SHADER))
-	GLCK(glShaderSource(vertex_shader, 1, &vertex_shader_text, NULL))
-	GLCK(glCompileShader(vertex_shader))
-	checkShader(vertex_shader, "vertex");
-
-	GLCK(fragment_shader = glCreateShader(GL_FRAGMENT_SHADER))
-	GLCK(glShaderSource(fragment_shader, 1, &fragment_shader_text, NULL))
-	GLCK(glCompileShader(fragment_shader))
-	checkShader(fragment_shader, "fragment");
-
-	GLCK(program = glCreateProgram())
-	GLCK(glAttachShader(program, vertex_shader))
-	GLCK(glAttachShader(program, fragment_shader))
-	GLCK(glLinkProgram(program))
-	checkProgam(program, "program");
-
-	GLCK(mvp_location = glGetUniformLocation(program, "MVP"))
-	std::cout << mvp_location << std::endl;
-
-	GLCK(vpos_location = glGetAttribLocation(program, "vPos"))
-	std::cout << vpos_location << std::endl;
-
-	GLCK(vnorm_location = glGetAttribLocation(program, "vNorm"))
-	std::cout << vnorm_location << std::endl;
-
-	GLCK(glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer))
-	glEnableVertexAttribArray(vpos_location);
-	GLCK(
-			glVertexAttribPointer(vpos_location, 3, GL_FLOAT, GL_FALSE, 0, (void*) 0))
-
-	if (vnorm_location >= 0) {
-		GLCK(glBindBuffer(GL_ARRAY_BUFFER, normal_buffer))
-		GLCK(glEnableVertexAttribArray(vnorm_location))
-		GLCK(
-				glVertexAttribPointer(vnorm_location, 3, GL_FLOAT, GL_FALSE, 0, (void*) 0))
-	}
-
-	ImGui_ImplGlfwGL3_Init(window, true);
-
-	while (!glfwWindowShouldClose(window)) {
-		glfwPollEvents();
-		ImGui_ImplGlfwGL3_NewFrame();
-		{
-			static float f = 0.0f;
-			static float resolution = 0.1f;
-			ImGui::Text("Hello, world!");
-			if (ImGui::Button("Wireframe"))
-				glPolygonMode( GL_FRONT_AND_BACK, GL_LINE);
-			if (ImGui::Button("Fill"))
-				glPolygonMode( GL_FRONT_AND_BACK, GL_FILL);
-			ImGui::InputFloat("Resolution", &resolution);
-			ImGui::Text("Application average %.3f ms/frame (%.1f FPS)",
-					1000.0f / ImGui::GetIO().Framerate,
-					ImGui::GetIO().Framerate);
-		}
-		int width, height;
-		glm::mat4 m(1.0f), p, mvp(2);
-
-		glfwGetFramebufferSize(window, &width, &height);
-		float ratio = width / (float) height;
-
-		glViewport(0, 0, width, height);
-		glClear(GL_COLOR_BUFFER_BIT);
-
-		m = glm::rotate(m, (float) glfwGetTime(), glm::vec3(0.f, 0.f, 1.f));
-		//m = glm::translate(m, glm::vec3(-1.f));
-		//glm::translate(mvp, glm::vec3((float) glfwGetTime()));
-		p = glm::ortho(-1.f, 1.f, -1.f, 1.f);
-		mvp = p * m;
-
-		GLCK(glUseProgram(program))
-		GLCK(
-				glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) &mvp))
-
-		// Draw the triangles !
-		GLCK(glBindVertexArray(vertex_array))
-		glDrawElements( GL_TRIANGLES, polygonizer.triangles.size() * 3,
-				GL_UNSIGNED_INT, (void*) 0);
-		//GLCK(glDrawArrays( GL_TRIANGLES, 0, polygonizer.triangles.size() * 3))
-		ImGui::Render();
-		glfwSwapBuffers(window);
-
-	}
-
-	glfwDestroyWindow(window);
-
-	ImGui_ImplGlfwGL3_Shutdown();
-
-	glfwTerminate();
 }