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  1. The Volumetric Geometry mode does not work with Probabilistic Volumetrics.
  2. The Volumetric Geometry mode tends to be slower to render. Ideally, you should work in Volumetric mode all the time and switch to Volumetric Geometry only when generating the Render Element passes.
  3. The Approximate and Approximate+Shadows Scattering options under Volumetric Render Settings → Smoke Color are not supported in Volumetric Geometry mode. It would default to Disabled scattering.
  4. You may need to increase the V-Ray Settings → Renderer → Options → Materials → Max.Transparency Levels option which will slow-down rendering. When rendering in Volumetric Geometry mode, procedural geometry made up from multiple transparent layers is generated at render-time. Think of it as sprites used in video games - a sequence of slices facing the camera.
  5. The default 3ds Max Scanline renderer is not supported.


UI Text Box

 When rendering with V-Ray GPU, the Render Mode does not matter - Render Elements are generated and the rendering speed is the same in both the Volumetric and Volumetric Geometry modes.