Geometry Shader Implementation

Can someone please guide me on how to inject Geometry Shader Code?

In VTK 8: vtkOpenGLPolyDataMapper::AddShaderReplacement
In VTK 9 (and current master): vtkShaderProperty::AddGeometryShaderReplacement

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I found that AddShaderReplacement didn’t work from Python for geometry shaders, so I have used vtkOpenGLPolyDataMapper::SetGeometryShaderCode.

You can see a simple example here that takes in a cube and replaces each vertex with a pyramid. The example uses the FURY library, but the shader part is raw VTK.

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