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--></style></head><body><div data-externalstyle="false" dir="ltr" style="font-family:Calibri,'Segoe UI',Meiryo,'Microsoft YaHei UI','Microsoft JhengHei UI','Malgun Gothic','Khmer UI','Nirmala UI',Tunga,'Lao UI',Ebrima,sans-serif;font-size:12pt;"><div> </div><div>> Here's my question. If I call vtkActor->SetUserMatrix to some matrix - <br>> I see that the actor moves far away from the origin (because I know my <br>> axes haven't moved), yet, when I execute the following code, it tells me <br>> the actor is still at the origin... I don't understand, I'm obviously <br>> missing something.<br></div><div> </div><div>Have you tried calling GetBounds or GetCenter instead?<br> <br>The documentation of these methods [ in the parent class: http://<a title="http://www.vtk.org/doc/nightly/html/classvtkProp3D.html" href="http://www.vtk.org/doc/nightly/html/classvtkProp3D.html" target="_parent">www.vtk.org/doc/nightly/html/classvtkProp3D.html</a> ] says they should be returned in “world coordinates.”<br><br>The actor’s position is within its own coordinate system...<br></div><div> <br>HTH,<br>David C.</div><div><br> </div></div></body></html>