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Add support for using both textures and interpolated scalars

Lucas Gandel requested to merge LucasGandelKitware/vtk:texture-with-interpolate-scalars into master

When InterpolateScalars is enabled and the ColorMode is set to MapScalars, vtkOpenGLPolyDataMapper internally uses a texture for scalar coloring. Using this color texture should not prevent adding other textures with multitexturing. Besides supporting multitexturing, the actor texture defined with actor->SetTexture(...) is also supported after explicitly specifying the TCoords array on the mapper: mapper->MapDataArrayToMultiTextureAttribute("actortexture", ...)

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