[vtkusers] local visualization

[Yixun Liu]

Hi,
I have a three-dimensional image with size 256x256x256. After it is
rendered on the screen, I change some data of  the image in a small box
with size 50x50x50. I  want VTK only to render the modified data, but leave the unmodified data on the screen. I want to know if VTK supports this. Maybe this is not a VTK issue. What I need to do is to disable the erasion of the image  buffer.

Best,

Yixun