hi everyone!

I'm looking for a ray -> box intersection function for my raytracer. if anyone knows one or has one, please let me know.

here is the one i have yet (ported from other code). the problem is, that no picked coordinates and normals are returned.

variables:

XYZ - Cube positions

Width, Height, Depth - Cube size

Code:

public bool Pick(double ray_x, double ray_y, double ray_z, double ray_nx, double ray_ny, double ray_nz)
{
double bminx = X - Width / 2;
double bminy = Y - Height / 2;
double bminz = Z - Depth / 2;
double bmaxx = X + Width / 2;
double bmaxy = Y + Height / 2;
double bmaxz = Z + Depth / 2;
double txmin = 0, txmax = 0, tymin = 0, tymax = 0, tzmin = 0, tzmax = 0;
if (ray_nx > 0)
{
txmin = (bminx - ray_x) / ray_nx;
txmax = (bmaxx - ray_x) / ray_nx;
}
else
{
txmin = (bmaxx - ray_x) / ray_nx;
txmax = (bminx - ray_x) / ray_nx;
}
if (ray_ny > 0)
{
tymin = (bminy - ray_y) / ray_ny;
tymax = (bmaxy - ray_y) / ray_ny;
}
else
{
tymin = (bmaxy - ray_y) / ray_ny;
tymax = (bminy - ray_y) / ray_ny;
}
if (txmin > tymax || tymin > txmax) return false;
if (tymin > txmin) txmin = tymin;
if (tymax < txmax) txmax = tymax;
if (ray_nz > 0)
{
tzmin = (bminz - ray_z) / ray_nz;
tzmax = (bmaxz - ray_z) / ray_nz;
}
else
{
tzmin = (bmaxz - ray_z) / ray_nz;
tzmax = (bminz - ray_z) / ray_nz;
}
if (txmin > tzmax || tzmin > txmax) return false;
return true;
}

thanx in advance