Collisions :

- sphere :
  - ultra-basic collision detection sample
- meshhit :
  - basic raycast collision with a mesh
  - finding mesh surface point and normal below mouse
- octree :
  - raycast collision with a complex (high poly) mesh
  - using the octree to speed up collision detection
- boxedin :
  - sphere bouncing inside a 3DS object
  - sphere collision detection with a complex (high poly) mesh
  - using the octree to speed up collision detection
- raycast :
  - raycasting intersection sample (RayCastIntersect function)
  - a two-cents worth raytracer
- facevsface :
  - accurate face vs face collision detection between freeforms
  - accurate collision detection between cubes (test case)
  - moving objects in 3D with the mouse

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