Cycles: Optix-OSL sampling issue of window texture coordinate #108372
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Reference: blender/blender#108372
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System Information
Operating system: windows 10 Pro
Graphics card: RTX 3090 (game ready driver version 531.79)
Broken:
First noticed: blender 3.6.0 beta (19-05-23)
Encountered again in: 4.0.0 alpha (26-05-23)
Worked: Unknown
Short description of error
In the attached blend, when OptiX is used in conjunction with cycles OSL, window texture coordinates are scaled by the distance of the viewport camera to the shaded position. I confirmed this by scaling window coordinates by 1 / view distance. The scaling also applies to textures sampled using these coordinates.
Texture normals appear to also differ slightly between Optix and CPU, with normals appearing darker with OptiX disabled, no other co-ordinates are affected as far as I know.
Exact steps for others to reproduce the error
Distance_scaled_window.blendfile.Workaround:
Test file: Distance_scaled_window.blend
Video: Video demonstation
Hey, thank for report. Pleas, <10 nodes in one tree, with packed textures and without story, just steps to see the bug and steps to reproduce it. It really hard to try to confirm/bisect/fix something like that.
Updated blend file: removed all nodes that didn't appear in the attached video "blue_viewZ.mp4", textures are now packed.
Updated report: removed first person accounts of how this bug occurred. Added additional context for texture sampling side-effect in OSL.
Hi, thanks for the report.
As far as I understand, the blue shading is due to
face orientationproperty fromviewport overlayspanel.I'm observing tiled texture with OptiX+ OSL options. Is this you're reporting here?
That's right, a misunderstanding on my part. It isn't related to the issue.
I'm not sure what you mean. To be more specific. In the attached blend, when OptiX is used in conjunction with cycles OSL, window texture coordinates are scaled by the distance of the viewport camera to the shaded position. I confirmed this by scaling window coordinates by 1 / view distance. The scaling also applies to textures sampled using these coordinates.
Texture normals appear to also differ slightly between Optix and CPU, with normals appearing darker with OptiX disabled, no other co-ordinates are affected as far as I know.
Iv'e attached a demonstration of what I see on my end in case this depends on the machine used.
Thanks, I can confirm.
I'll edit the report to make the description more clear.
Vector transform node: viewport texture projection altered in an unrecoverable wayto Cycles: Optix-OSL sampling issue of window texture coordinatecc @pmoursnv
Patrick Mours referenced this issue2023-11-17 17:25:53 +01:00
Patrick Mours referenced this issue2023-11-17 17:26:35 +01:00