2022-02-07 Render & Cycles Meeting


  • Brecht Van Lommel (Blender)
  • Lukas Stockner (Blender)
  • Nikita Sirgienko (Intel)
  • Sebastian Herholz (Intel)
  • Patrick Mours (NVIDIA)
  • Christophe Hery (Meta)
  • Brian Savery (AMD)


  • Lukas is working on merging the Glossy and Anisotropic BSDF node, improve the Glossy BSDF to be compatible with MaterialX, and using the proper per-microfacet Fresnel for glass.
  • Weizhen is working on improvements to light gizmos in the 3D viewport.
  • Path guiding of glossy is being tested by users with good results.
  • Light ray visibility bug: the current patch uses too much GPU memory. Discussed using an approximation but this also seems not ideal. Strategy would be to remove the transmission control and gain back memory by compressing diffuse/glossy ratio as half float.
  • HIP-RT is under review but still waiting for a driver. This will be postponed to 3.6 to give enough time for review and testing, but we plan to have a test build available before the 3.5 release.
  • HIP compiler bugs are still waiting for a new compiler version to fix them. Brian will check the status, Brecht will check what the exact errors and failing architectures are with latest main.

Practical Info

This is a weekly video chat meeting for planning and discussion of Blender rendering development. Any contributor (developer, UI/UX designer, writer, …) working on rendering in Blender is welcome to join and add proposed items to the agenda.

For users and other interested parties, we ask to read the meeting notes instead so that the meeting can remain focused.


not directly related but is it possible to remove that long trail of the area light ?

Or make it so it reflect a custom distance set up by the user ? or better make that option always available like in eevee.


Agree but i would prefer to set opacity for those lines in theme settings.

Also, by default lights are too big, to have setting like ‘Default empty size’ but for light would be logical.

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Can you share information about the meeting results, for example, what decision did you make about light linking?


There will be a new thread about 2023-02-22 Render & Cycles Meeting. Just wait for it.


thank you for answer, I’m looking forward to the results, because it’s a much-needed feature for architectural visualizers like me.

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Has the next Render & Cycles meeting been scheduled? It’s been a while since we’ve heard any updates.


Go here: 2023-02-21 Render & Cycles Meeting