Inverse of glTranslatef(x, y, z) is glTranslatef(-x, -y, -z)
Inverse of glRotatef(angle, x, y, z) is glRotatef(-angle, x, y, z)
Inverse of glScalef(x, y, z) is glScalef(1.0/x, 1.0/y, 1.0/z)
Inverse of a series of transformations is the inverses of the individual transformations, in reverse order.