Hi all, In my program vtkImageStencil take alomost 2-3 mins for vtkImageData with 160 slices with 0.9x0.9x2.5 spacing. Is there any way to speed up this? Thanks Jothy -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20110723/b2174486/attachment.htm>