hello all, im trying to figure out the section of code below. the section that confuses me is glGetFloatv(GL_MODELVIEW_MATRIX, mat); what is the GL_MODELVIEW_MATRIX? ive searched google for the keyword, but it just returns example programs with the keyword in (with no comments or explanation). I need a definition or an explanation to help understand it. Could someone tell me what is does, or where a resource exists that provides a description of these things. Thanks in advance! matrix mat, tmat; vector x, y; glGetFloatv(GL_MODELVIEW_MATRIX, mat); mat.Transpose(tmat); x.Set(tmat[0], tmat[1], tmat[2]); y.Set(tmat[4], tmat[5], tmat[6]);