What is Euler phi in Rotate3D[obj, phi,theta,psi]

*To*: mathgroup at smc.vnet.net*Subject*: [mg3909] What is Euler phi in Rotate3D[obj, phi,theta,psi]*From*: adbened at alumnae.caltech.edu ( Alto D. Benedicto)*Date*: Sun, 5 May 1996 23:12:43 -0400*Organization*: California Institute of Technology, Pasadena*Sender*: owner-wri-mathgroup at wolfram.com

Why is it that: Rotate3D[object3D, Pi/2, Pi/2, 0] doesn't show the same picture as Rotate3D[Rotate3D[object3D, 0,Pi/2,0], Pi/2, 0, 0]? It seems that the angle PHI doesn't behave according to the definition on p.113 of Guide to Std Mma Pkg. As far as I understand it, the definition of Rotate3D[obj, phi, theta psi] is Rotate3D[Rotate3D[Rotate3D[obj,0,0,psi],0,theta,0],phi,0,0]. (THETA and PSI are clockwise rotation wrt X and Z axis). I'm sure I'm missing something. THANK YOU in advance for any clarification. Alto adbened at aruba.ccit.arizona.edu ==== [MESSAGE SEPARATOR] ====