Hi Cristoph.
You missed a opening parenthesis sign - '(' after "\pstThreeDLine".
Wrong:
>> \pstThreeDLine0,0,0)(2 \PhiI\space cos mul 1.5 add, \PhiI\space sin, 0)
Right.
>> \pstThreeDLine(0,0,0)(2 \PhiI\space cos mul 1.5 add, \PhiI\space sin, 0)
WBR Ali Shadow