How is a 1X3 vertice matrix multiplied?? by the modelview matrix in OpenGL to hold the new referance frame. I know that once the modelview is rotated and translated as required it is multiplied by the required vertacies. How does glRotate calculalte new points from exsisting points and an angle how does it multiply the matracies and what matrice does it use to multiply and give the new rotated points??? Thanks Steve