I''ve been playing with the code for lesson 26 the whole day now so I can understand how it works, but there is something I can''t figure out: The plane equation of the reflecting plane. I have lowered the plane Nehe made in his code to y==-1 but the reflection comes through the plane. I tried changing the plane equation (represented as "double eqr[] = {0.0f,-1.0f, 0.0f, 0.0f};" in the code) but there is no change. I guessed that the fourth number was the distance to the plane so I changed it to -1 (and 1 just to make sure) but it STILL comes out of the plane. I can change this however I want, no change at all. Can someone explain to me what I should change to get the plane reflect on y==-1 or any other arbitrary height/position? Thank you!

OK, I solved the problem. It had to do with the translation of the reflected object.

My next problem is in my own project: the reflected object is reflected on non-reflective surfaces.
Anyone?

reflected on non-reflective surfaces ... what the heck ?
could you please post a screenshot because what you''re saying doesn''t make sense (and obviously that''s why you''re reporting the problem )