I downloaded the newest stable build of paraview yesterday (upgrading from 4.1) so I could utilize the new features in pvpython (Screenshot, etc). Unfortunately, I ran into what appears to be a bug in the handling of clipping/opacity for vti files.
I have a 2D field that ranges from -20 to 110 and I need to isolate the negative regions and discard the positive regions. I do this by clipping (type: scalar, value: 0, inside out). In the new version, this clips the entire field - nothing remains. An alternative method that smooths out the transition is to map the scalar from -2 to 2, setting zero opacity at 2. In the new version of paraview, this blanks out both the positive and negative values, leaving only the region between -2 to 2. A color map without opacity works as expected, and the legend shows the correct opacity behaviour. Playing around with the range of the transfer function, the negative values begin to blank out when the positive limit is set below 20. This would seem to indicate a bug in the application of the transfer function to the image grid surface render. If I repeat the tests using a vtr file and identical data, both clipping and opacity work as expected. I see the same results on my mac and linux workstation. *Gabriel D Weymouth* Southampton Marine and Maritime Institute Lecturer University of Southampton Boldrewood Campus, Building 176, Room 3029 Southampton, SO16 7QF, UK
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