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Lucas Tebib avatar image
Lucas Tebib asked ·

aiMatte weird behavior

Hello!

On the last Arnold version (3.1.1), it seems that there's a problem: when using aiMatte on an object, even if the Opacity is set to 0 (black), it appears as 1 in the Alpha (so it's white).

On a previous version (can't remember which one, but one from September 2018 probably), it worked correctly.

Thanks a lot

opacityalpha for geometrymattes
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Stephen Blair avatar image
Stephen Blair answered ·

I don't see that behavior. Do you have a repro? (an ass file or scene that reproduces the problem)

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Lucas Tebib avatar image
Lucas Tebib answered ·

Hi, I attached a Maya scene (*.ma, created on Maya 2018). The plane should be black in the Alpha, but still appears white.

Thanks a lot!

aimatte-issue.zip


aimatte-issue.zip (3.6 KiB)
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Lucas Tebib avatar image
Lucas Tebib answered ·

Just noticed that if I check the Matte options in the Arnold Attribute on the mesh, it works correctly (object is rendered as a black matte and is black in the Alpha). I'll probably use this option :)
Thanks!

EDIT: if I check the Matte option in the Attribute of the mesh, the mesh doesn't appears in the N, P, Z, motionvector, etc AOVs. I want it in these AOVs, so I need to keep using the aiMatte shader :p

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