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<DIV><FONT face=Arial size=2>thank you very much. the vtkProbeFilter will do my
job.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>then another question is comming. how can i know
the current orientation of the volume after a serie of rotiations? </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>i think there is one solution. initially create a
plane with proper normal. all the rotations do the same way to the plane. when i
need the orientation, i can get the normal of the plane. Are there any natural
solutions?</FONT></DIV></BODY></HTML>