public override void colorize(Ray r)
{
vect3d diff_accum = new vect3d(0, 0, 0);
vect3d spec_accum = new vect3d(0, 0, 0);
lightDirectPointSpec(r, specular_coeff, ref diff_accum, ref spec_accum);
r.color = diff_accum.times(diffuse_color) + spec_accum.times(specular_color);
}
public override void colorize(Ray r)
{
vect3d diff_accum = new vect3d(0, 0, 0);
vect3d spec_accum = new vect3d(0, 0, 0);
lightDirectPointSpec(r, specular_coeff, ref diff_accum, ref spec_accum);
// calculate the polar coordinates
vect3d sp;
sp.x = -Math.Atan2(r.hit_tex_coord.z, r.hit_tex_coord.x) / (2 * Math.PI);
sp.y = -Math.Atan2(Math.Sqrt(r.hit_tex_coord.x * r.hit_tex_coord.x + r.hit_tex_coord.z * r.hit_tex_coord.z), r.hit_tex_coord.y) / (Math.PI);
sp.z = 0;
vect3d diffuse_color = tex.sample(sp);
r.color = diff_accum.times(diffuse_color) + spec_accum.times(specular_color);
}