Quote:Original post by shodanjr_gr
glGetFloatv(GL_MODELVIEW_MATRIX, modelview_matrix);
m4_inverse(inverse_modelview, modelview_matrix);
glMultMatrixf(inverse_modelview);

What you do here is to load the modelview matrix, calculate the inverse and multiply the current matrix with its inverse. The result will be (or should be due to possible precision errors) the identity matrix.

So replace those 3 lines with glIdentity(); for more efficiency.


Edit: what you do is to render quads in the center of the screen and just move them further away from the camera. So you do exactly what I asked you earlier: "If I understand your initial question correctly, do you want to have quads that always have the same size and position on the screen, independent of the camera?" ;)

Just keep in mind that the first quad would never be rendered if perspective projection was applied since you'd not have a near clipping plane at 0.0.

Edit2: if you want each quad to fill the screen, just don't apply any projection matrix. Clip space goes from 1- to 1, so your quads already have unprojected full-screen size. But you should rethink the z-values then.