How would I go about checking for line-line or line-poly intersections? This is for collision detection (only after checking for bounding sphere collisions of course). Detecting collisions between a line and polygon is my priority, but I also need line-line intersection for another 3D app with only 2D interaction. Morgan

Look here http://www.swin.edu.au/astronomy/pbourke/geometry/

Nate
http://nate.scuzzy.net

Thanks, Nate! By the way, your normals doc helped me out a lot, but I was surprised that you didn''t include the code for doing the cross product (not everybody knows this).

Morgan


struct VERTEX
{
float x,y,z;
};

void crossproduct(VERTEX v1,VERTEX v2,VERTEX *dest)
{
dest->x = v1.y*v2.z - v1.z*v2.y;
dest->y = v1.z*v2.x - v1.x*v2.z;
dest->z = v1.x*v2.y - v1.y*v2.x;
}


I hope this helps you.

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GA

Edited by - ga on May 21, 2000 5:53:44 AM

Actually, I already had it (my new lighting code, thanks to Nate, has been running for a few days now). I was just surprised that he didn''t include it.

Morgan