Bloom TOP & LumaBlur Artifacts Issue

General TouchDesigner Discussion
1

Hi everyone,

I’m running into an issue when using the Bloom TOP and LumaBlur in TouchDesigner.

  • When applying Bloom TOP to my visuals, the entire screen sometimes turns completely black if I move any of the geometry.
  • When using LumaBlur, I get persistent black artifacts in the center of the screen (or in random areas) that do not disappear and do not move with the geometry.

My Setup:

  • Using PBR materials with tangents and normals, environment lighting, and standard lights.
  • The issue happens whether Bloom is placed immediately after the Render TOP or further down the processing chain.
  • 32-bit float rendering is enabled.

Has anyone experienced this before? Could this be related to depth buffer precision, alpha blending, or something else?

Any insights would be appreciated!

Thanks!

2

I’ve learned that if I use a Level TOP and turn on Clamp from 0-1 it fixes it.

Can someone explain whats going on here in more depth? How can I set up my geometry so that I don’t need to clamp levels?