I found a lot of collisions libs and I don't know what lib to pick. Any help pls? ColDet - http://photoneffect.com/coldet/ RAPID - http://www.cs.unc.edu/~geom/OBB/OBBT.html OPCODE - http://www.codercorner.com/Opcode.htm SOLID - http://www.win.tue.nl/~gino/solid/ .... (more on google) I need the collision lib for Camera Collison (only collison detection) in a program. poly: triangle poly soup ide: VC .Net 2003 (C++) So what shell I chose?

so, you only need collision detection to see if the camera runs into the world geometry or something?

if the number of polygons in your world is low [few thousand triangles I guess], you could even go with a simple iterative intersection search with a sphere.

so, what is the camera colliding with?

Triangle poly soup: 17.000 (curent scene) up to 200.000
(and I need something fast)

OPCODE seems to be good. (used in ODE)