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Amin Yavarimoghadam avatar image
Amin Yavarimoghadam asked ·

How can I use my vertex color alpha data from a RGBA colorset to provide it as opacity in aiStandardSurface shader ?

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Stephen Blair avatar image
Stephen Blair answered ·

You can't do it with aiUserDataColor, because that shader is RGB, not RGBA.

I suppose you could un-hide aiUserDataRGBA (the user_data_rgba node from Arnold) and use that. To do that, edit mtoa.mtd

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You Rock Man. Thank you so much. It works. For those who have same problem, you should edit mtoa.mtd and look for [node user_data_rgba] and make maya.hide BOOL "True" to "False". You can find "Out alpha" output by right click on "aiUserDataRgba" node and "Show all attributes".

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Denes Dankhazi avatar image
Denes Dankhazi answered ·

I would be a better solution to give us the option to choose between RGB and RGBA mode inside the aiUserDataColor node.

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