Hi Evan, This is already supported in VTK for the volume mapper. You can have a single array with either 2 components and set them as dependent components via vtkVolumeProperty <http://www.vtk.org/doc/nightly/html/classvtkVolumeProperty.html#aea26cdad334f47cf078c3ab9f1b70764>. This feature is not exposed in ParaView but it would just be a matter of creating the GUI elements and adding a filtering step to combine two arrays into a single two-component array.
For polygonal data, can’t think of a better route than the one suggested by Utkarsh i.e. manually map the arrays through the lookup tables and create an RGBA array. Make sure to uncheck Map Scalars to use the RGBA values directly. Having said that, this can also be implemented as a feature on the vtkPolyDataMapper similar to the volume mapper. Hope that helps, Sankhesh From: Utkarsh Ayachit [utkarsh.ayac...@kitware.com](mailto:utkarsh.ayac...@kitware.com) <http://mailto:[utkarsh.ayac...@kitware.com](mailto:utkarsh.ayac...@kitware.com)> To: Evan Kao [tos...@gmail.com](mailto:tos...@gmail.com) <http://mailto:[tos...@gmail.com](mailto:tos...@gmail.com)> Cc: ParaView [paraview@paraview.org](mailto:paraview@paraview.org) <http://mailto:[paraview@paraview.org](mailto:paraview@paraview.org)> Bcc: Date: Thu, 29 Jun 2017 10:55:45 -0400 Subject: Re: [Paraview] Use separate arrays for colormap and opacity One option is to use “Python Programmable Filter” to generate an RGBA array in which you do the color and opacity mapping yourself. You won’t have access to the color and opacity transfer ParaView sets up, but you can create your own internally. Not the most elegant solution — but a solution, nonetheless. Utkarsh -- Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware <http://www.kitware.com/> | (518) 881-4417
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