Forums Technical Discussion Houdini 21 Alpha attribute displaying weird in viewport.

Houdini 21 Alpha attribute displaying weird in viewport.

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smbell
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In 20/20.5 I could set @Alpha to see a quick opacity preview in the viewport. It was nice for flipbooks, now in Houdini 21. It displays a value of 0 for @Alpha as something that looks like a facing ratio shader. Not sure what it's doing exactly.

Everything not red has an @Alpha of 0.0.





Edited by smbell - 2025年9月6日 00:08:49

Attachments:
alpha_1.png (1.4 MB)
alpha_2.png (1.6 MB)
alpha_3.png (1.5 MB)

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smbell
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It does display correctly with no lights enabled:

Attachments:
alpha_4.png (1.5 MB)

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smbell
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ok, so enabling ambient occlusion makes it work correctly with other lighting modes:

Attachments:
alpha_5.png (1.5 MB)

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freshbaked
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Looks like this may have been fixed.

21.0.468
Fixed transparency in Work Light mode not multiplying alpha-parallel by geometry and texture alpha, causing A=0 areas of the textures to ghost at some angles.
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