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OpenGL rendering without lighting / flat color only


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Hi everyone! I discovered this issue while trying to wedge simulation and create a montage with opengl render.
Here are 2 screenshot to expose the issue and compare my viewport (properly shaded) vs my OpenGL render (flat grey)

I have tried many different approaches to get my shading back (it used to be working fine a couple months ago):

- Using only "force lights" to prevent any unwanted disabling of any lights
- Updating my nvidia drivers (576.02)
- Checking with every different light types
- Setting my viewport render engine to openGL (works fine in the viewport)
- Using high light samples, full HDR & every different shadow types

I tried this with 2 different houdini 20.5 versions (487 & 550) and got the same bad results.
I'm on a windows 11 PC with an RTX 3090.

Any ideas about how to solve this issue?

Viewport_screenshot.png

OpenGL_screenshot.png

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