Garfield9986

The light refraction effect of the shader is not working.

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### Description of Issue When I used usdview to open an asset with a glass material, usdview didn't always display the glass correctly. ### Steps to Reproduce I wanted to...

extract_features.py文件只在第一版中提供

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v2版本中extract_features.py文件只在第一版中提供，然而在v2版本还是必须的，并且没有--downsample参数。 另外，请问在那里可以下载能运行get_clip_features.py文件的clip模型呀？（比如ViT-B-16-laion2b_s34b_b88k.bin）

Dear author, I sincerely admire you for this excellent work, I am new to this field, and I am very impressed to see your work. There are a few things...