Mix Shader node fails with Interactive render quality

[lenhone]

"mix shader" node is "supported" as it is available in the selection menu when RPR is in use and has no exception listed here... but it does not work.

Issue

• "mix shader" node works as expected for eevee, cycles and RPR "final"
• "mix shader" node fails to mix with RPR "interactive" render quality set.
• "RPR layered shader" also fails with RPR "interactive".

Steps to Reproduce

Connect 2 shaders to "mix shader" note, set render to RPR "interactive" and observe that shaders are not mixed.

System Setup (Environment)

OS: Linux CPU: 5900X GPU: RX6800 Blender 3.3 / RPR 3.5.0

Detailed Description

• Please fix the "mix shader" node for RPR "interactive".
• Consider removing "RPR layered shader" as it duplicates the functionality of "mix shader" and makes RPR less compatible with eevee / cycles.
• Consider testing RPR "interactive" and RPR "final" supported nodes against eevee / cycles (with a sensible margin for render engine difference)

[ARozghon]

thank you for your request mix shader not supported by RPR "Interactive" yet by the core side, and this issue is valid for all supported OS: Windows, Linux, macOS

[lenhone]

Thanks for the response. Is there a list of "blender" nodes ( I try not to use RPR nodes ) that RPR "Interactive" supports as this is ambiguously / incorrectly described in the manual?

[ARozghon]

hi, RPR interactive is now primarily focused on full Material X nodes support with USD Hydra, so the list of supported RPR nodes and materials will be extended in the nearest future. thank you