LIB:
- fix polygonize
- 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