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tj963

Octrees

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Hi, I''m using an Octree for raytracing. When the ray intersects a cube, I check the ray against the children or if there''s no children, against the triangles in it. The problem is that I don''t know how to figure out(efficiently) which cubes inbetween the veticies of the triangle contain the triangle. For example, if there is a few small triangles in front of a big one, when I create new children for the small one, I don''t know how to detect if the big one is still in the cube. Hopefully that''s clear. Thanks, tj963

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I developped a RayTracer one month ago with an octree. I had somme problem correctly to detect the face in the cube. The real difficulty was to detect a face inside a cube when no vertex are inside it.
Find the pdf called:

Fast 3D Triangle-Box Overlap Testing
Tomas Akenine-Möller
Chalmers University

It seems hard to understand but in fact the mathematics used are quite simple. However you could program the algorithms without understand everything. Finally the test is quick and the code is available online.

Good luck !

Edited by - ArnoAtWork on February 25, 2002 4:34:08 AM

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