Hi, I use paraview to render ocean model data. My datasets are usually rectilinear grids, cell data and / or point data. Frequently I want to mask points that are below the level of topography, so I usually set those points to NaN when preparing my data for paraview.
I do a lot of volume rendering, so I am very familiar with the opacity mapping options within the colormap editor. The colormap editor allows you to choose your NaN color, but this dialog doesn't include an alpha / opacity option. Would that be difficult to add? It would really help me. Instead, what I have to do is use a clip filter to mask the NaNs, which ends up turning my rectilinear grid data into unstructure grid data, with significant performance and memory impacts. If NaNs could be made transparent at the level of the color map editor, it would make my pipeline much more efficient. Is this a feature that might be supported in future releases? Thanks, Ryan Abernathey
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