Is it possible to achieve bloom/glow effect in VTK?

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Hello,

I’m not aware of any simple VTK switch to turn on glow effect. But I can think of two approaches:

  1. Working with the OpenGL buffers to post-process your rendered scene:

You can try this: https://learnopengl.com/Advanced-Lighting/Bloom . These are, of course, direct OpenGL calls which, of course, require an OpenGL render window.

To use lower level OpenGL API with a VTK application, you can refer to: https://discourse.vtk.org/t/how-to-use-original-opengl-in-vtk-program/4636

  1. Writing a shader code and assigning it to your vtkMapper:

There is a simple example of a glow effect shader here: https://lettier.github.io/3d-game-shaders-for-beginners/bloom.html .

To set a custom shader to a vtkMapper you can refer to this: https://vtk.org/Wiki/Shaders_In_VTK.

best,

Paulo

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