Lefthanded coordinate systemThe default coordinate system in the RenderMan(TM) Interface is lefthanded: the positive x, y and z axes point right, up and forward, respectively. Positive rotation is clockwise about the axis of rotation.

Righthanded coordinate systemThe default coordinate system in OpenGL(TM) is righthanded: the positive x and y axes point right and up, and the negative z axis points forward. Positive rotation is counterclockwise about the axis of rotation. 

positive x rotation
positive y rotation
positive z rotation

positive x rotation
positive y rotation
positive z rotation
