On Thursday 27 March 2003 15:09, Sebastien Auclair wrote: > It should be (90.0, 90.0, 0) and not (90.0, -0.0, 90.0) !!!! Mathematically, these are the same transformation (given the order of operations, Rz->Rx->Ry). Maybe that could be your problem. HTH, Tuhin -- Graduate Research Assistant Dept. Of BME Vanderbilt University 615-343-8261