reflect() function for normal and light vector?

edit:
-2.0f * n * (n*normalize(v)) + v

where n is the surface normal and v is the direction vector you want to reflect

since you aren't normalizeing v i think you're over estimateing the projection of v onto n which would fuck up your results.

v-2*n*(n.v) is correct as long as n is normalized. If it isn't, v - 2*n*(n.v)/(n.n) is the way to go. v doesn't need to be normalized in either case.

Quote:

Original post by Darkstrike v-2*n*(n.v) is correct as long as n is normalized. If it isn't, v - 2*n*(n.v)/(n.n) is the way to go. v doesn't need to be normalized in either case.

quoted for truth.

sorry, i didn't think before posting.

Thx. I am normalizing all vectors, just did not explicitly note that here.

Quote:

I am normalizing all vectors, just did not explicitly note that here.

Not the velocity I hope ...