How to optimize SVBRDF(Texture) about redner

[tim37021]

should I re-assign text to diffuse_reflectance??
it seems the texels is not updated even if text is change.

scene.materials[-2].diffuse_reflectance = pyredner.Texture(text)

[tim37021]

If I try to rebuild the graph by reassign texture to diffuse reflectance.
Cuda memory access error will occur

[BachiLi]

Hi,
The key is to do the re-assignment also in the gradient descent loop, so that PyTorch will propagate the derivatives for you. I added an example (and fixed a bug related to roughness texture derivatives) in https://github.com/BachiLi/redner/blob/master/tests/test_svbrdf.py
Let me know if there's other issues.

[BachiLi]

Closing this issue. Feel free to reopen if there are other questions.