Mesh voxelization with two colours

[lassoan (Andras Lasso)]

@isuruwi

Should I use vtkPolyDataToImageStencil and vtkImageStencil for that ? If so how ?

Yes, that’s a good approach, too. For each material, extract cells using vtkThreshold filter, get outer surface using vtkGeometryFilter, and fill the image using vtkImageStencil.