291 lines
7.2 KiB
C++
291 lines
7.2 KiB
C++
/*
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Bullet Continuous Collision Detection and Physics Library
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Copyright (c) 2003-2006 Erwin Coumans http://continuousphysics.com/Bullet/
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This software is provided 'as-is', without any express or implied warranty.
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In no event will the authors be held liable for any damages arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it freely,
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subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef OBB_BOX_MINKOWSKI_H
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#define OBB_BOX_MINKOWSKI_H
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#include "btPolyhedralConvexShape.h"
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#include "btCollisionMargin.h"
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#include "BulletCollision/BroadphaseCollision/btBroadphaseProxy.h"
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#include "LinearMath/btPoint3.h"
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#include "LinearMath/btSimdMinMax.h"
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///btBoxShape implements both a feature based (vertex/edge/plane) and implicit (getSupportingVertex) Box
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class btBoxShape: public btPolyhedralConvexShape
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{
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//btVector3 m_boxHalfExtents1; //use m_implicitShapeDimensions instead
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public:
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btVector3 getHalfExtents() const;
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virtual int getShapeType() const { return BOX_SHAPE_PROXYTYPE;}
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virtual btVector3 localGetSupportingVertex(const btVector3& vec) const
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{
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btVector3 halfExtents = getHalfExtents();
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return btVector3(btFsels(vec.x(), halfExtents.x(), -halfExtents.x()),
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btFsels(vec.y(), halfExtents.y(), -halfExtents.y()),
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btFsels(vec.z(), halfExtents.z(), -halfExtents.z()));
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}
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virtual inline btVector3 localGetSupportingVertexWithoutMargin(const btVector3& vec)const
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{
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btVector3 halfExtents = getHalfExtents();
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btVector3 margin(getMargin(),getMargin(),getMargin());
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halfExtents -= margin;
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return btVector3(btFsels(vec.x(), halfExtents.x(), -halfExtents.x()),
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btFsels(vec.y(), halfExtents.y(), -halfExtents.y()),
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btFsels(vec.z(), halfExtents.z(), -halfExtents.z()));
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}
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virtual void batchedUnitVectorGetSupportingVertexWithoutMargin(const btVector3* vectors,btVector3* supportVerticesOut,int numVectors) const
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{
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btVector3 halfExtents = getHalfExtents();
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btVector3 margin(getMargin(),getMargin(),getMargin());
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halfExtents -= margin;
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for (int i=0;i<numVectors;i++)
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{
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const btVector3& vec = vectors[i];
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supportVerticesOut[i].setValue(btFsels(vec.x(), halfExtents.x(), -halfExtents.x()),
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btFsels(vec.y(), halfExtents.y(), -halfExtents.y()),
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btFsels(vec.z(), halfExtents.z(), -halfExtents.z()));
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}
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}
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btBoxShape( const btVector3& boxHalfExtents)
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{
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m_implicitShapeDimensions = boxHalfExtents;
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};
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virtual void getAabb(const btTransform& t,btVector3& aabbMin,btVector3& aabbMax) const;
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virtual void calculateLocalInertia(btScalar mass,btVector3& inertia);
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virtual void getPlane(btVector3& planeNormal,btPoint3& planeSupport,int i ) const
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{
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//this plane might not be aligned...
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btVector4 plane ;
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getPlaneEquation(plane,i);
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planeNormal = btVector3(plane.getX(),plane.getY(),plane.getZ());
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planeSupport = localGetSupportingVertex(-planeNormal);
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}
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virtual int getNumPlanes() const
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{
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return 6;
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}
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virtual int getNumVertices() const
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{
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return 8;
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}
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virtual int getNumEdges() const
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{
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return 12;
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}
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virtual void getVertex(int i,btVector3& vtx) const
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{
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btVector3 halfExtents = getHalfExtents();
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vtx = btVector3(
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halfExtents.x() * (1-(i&1)) - halfExtents.x() * (i&1),
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halfExtents.y() * (1-((i&2)>>1)) - halfExtents.y() * ((i&2)>>1),
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halfExtents.z() * (1-((i&4)>>2)) - halfExtents.z() * ((i&4)>>2));
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}
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virtual void getPlaneEquation(btVector4& plane,int i) const
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{
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btVector3 halfExtents = getHalfExtents();
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switch (i)
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{
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case 0:
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plane.setValue(btScalar(1.),btScalar(0.),btScalar(0.));
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plane[3] = -halfExtents.x();
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break;
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case 1:
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plane.setValue(btScalar(-1.),btScalar(0.),btScalar(0.));
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plane[3] = -halfExtents.x();
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break;
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case 2:
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plane.setValue(btScalar(0.),btScalar(1.),btScalar(0.));
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plane[3] = -halfExtents.y();
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break;
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case 3:
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plane.setValue(btScalar(0.),btScalar(-1.),btScalar(0.));
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plane[3] = -halfExtents.y();
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break;
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case 4:
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plane.setValue(btScalar(0.),btScalar(0.),btScalar(1.));
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plane[3] = -halfExtents.z();
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break;
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case 5:
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plane.setValue(btScalar(0.),btScalar(0.),btScalar(-1.));
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plane[3] = -halfExtents.z();
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break;
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default:
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assert(0);
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}
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}
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virtual void getEdge(int i,btPoint3& pa,btPoint3& pb) const
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//virtual void getEdge(int i,Edge& edge) const
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{
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int edgeVert0 = 0;
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int edgeVert1 = 0;
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switch (i)
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{
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case 0:
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edgeVert0 = 0;
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edgeVert1 = 1;
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break;
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case 1:
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edgeVert0 = 0;
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edgeVert1 = 2;
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break;
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case 2:
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edgeVert0 = 1;
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edgeVert1 = 3;
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break;
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case 3:
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edgeVert0 = 2;
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edgeVert1 = 3;
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break;
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case 4:
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edgeVert0 = 0;
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edgeVert1 = 4;
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break;
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case 5:
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edgeVert0 = 1;
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edgeVert1 = 5;
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break;
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case 6:
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edgeVert0 = 2;
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edgeVert1 = 6;
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break;
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case 7:
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edgeVert0 = 3;
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edgeVert1 = 7;
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break;
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case 8:
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edgeVert0 = 4;
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edgeVert1 = 5;
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break;
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case 9:
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edgeVert0 = 4;
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edgeVert1 = 6;
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break;
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case 10:
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edgeVert0 = 5;
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edgeVert1 = 7;
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break;
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case 11:
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edgeVert0 = 6;
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edgeVert1 = 7;
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break;
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default:
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btAssert(0);
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}
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getVertex(edgeVert0,pa );
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getVertex(edgeVert1,pb );
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}
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virtual bool isInside(const btPoint3& pt,btScalar tolerance) const
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{
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btVector3 halfExtents = getHalfExtents();
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//btScalar minDist = 2*tolerance;
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bool result = (pt.x() <= (halfExtents.x()+tolerance)) &&
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(pt.x() >= (-halfExtents.x()-tolerance)) &&
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(pt.y() <= (halfExtents.y()+tolerance)) &&
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(pt.y() >= (-halfExtents.y()-tolerance)) &&
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(pt.z() <= (halfExtents.z()+tolerance)) &&
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(pt.z() >= (-halfExtents.z()-tolerance));
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return result;
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}
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//debugging
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virtual const char* getName()const
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{
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return "Box";
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}
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virtual int getNumPreferredPenetrationDirections() const
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{
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return 6;
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}
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virtual void getPreferredPenetrationDirection(int index, btVector3& penetrationVector) const
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{
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switch (index)
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{
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case 0:
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penetrationVector.setValue(btScalar(1.),btScalar(0.),btScalar(0.));
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break;
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case 1:
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penetrationVector.setValue(btScalar(-1.),btScalar(0.),btScalar(0.));
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break;
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case 2:
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penetrationVector.setValue(btScalar(0.),btScalar(1.),btScalar(0.));
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break;
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case 3:
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penetrationVector.setValue(btScalar(0.),btScalar(-1.),btScalar(0.));
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break;
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case 4:
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penetrationVector.setValue(btScalar(0.),btScalar(0.),btScalar(1.));
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break;
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case 5:
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penetrationVector.setValue(btScalar(0.),btScalar(0.),btScalar(-1.));
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break;
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default:
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assert(0);
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}
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}
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};
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#endif //OBB_BOX_MINKOWSKI_H
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