Thanks @ken-martin . Is it a requirement for the vtkScalarActor to use textures. I was thinking it could just use geometry and shading to accomplish rendering. I will dig a little deeper to see if I can disable using textures for this actor. I am using the vtkLegendBoxActor in the same project and it is rendering correctly so I would think a scalar bar could be implemented.
If you are moving away from OpenGL, what will the new backend be using? Does this mean using VTK in WebAssembly will not be possible?
Thanks!