1. glViewport changes the view to the specified window and position. Accepts the x and y axis, the width and height of the view port.

2. glMatrixMode(GL_PROJECTION) changes the type of matrix is used to do operations. The projection matrix works in camera space, so that the x and y coordinates are at the center of the screen.

3. glLoadIdentity() loads the identity matrix into the current matrix.

4. gluPerspective() changes the current frustum to the specified field of view angle, aspect ratio, and distance to clipping plane.

5. glMatrixMode(GL_MODELVIEW) changes the type of matrix used to do operations. The model view works in object space, the (0,0,0) point is the center of the object.

6. glMultMatrixf() multiplies the current matrix by the argument. Used for translating.