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I have this code for plane-ray intersection: http://pastebin.com/2VuPeZ5r
I think I compute t correctly, but I need to return null if there is no intersection.
How do I check that?
Thanks
What do you mean by “no intersection”? Any ray will intersect a plane somewhere, except for the degenerate case where the ray is exactly perpendicular to the normal of the plane. To detect that case, test for
Vector3.Dot(Norm, ray.Dir) == 0.If you want to know if the intersection is in front of or behind the ray origin, test for
t > 0.