5a50b46376
There are few layers of things which lead to the situation of more noisy material preview: the do-version of the preview.blend did not happen (at least from the Python side as we did not investigate the C side deep). This made Cycles to use default integrator settings for the preview file ever since the Cycles X was merged. Those settings are adaptive sampling with max 4K samples, noise threshold 0.01. Opening the file in Blender 3.0 for edit did run the versioning code which effectively lowered the number of samples used for rendering. This change makes it so the preview file is configured with the exact effective settings as seen by Cycles prior to the file was re-saved (adaptive sampling with the parameters noted above). This fix does not chaneg the fact that the versioning code is not used for preview.blend, it only solves the regression in the quality of previews. The fix is done and reviewed with collaboration with Dalai and Sergey. |
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