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Transparency, opacity, and the alpha channel

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AOV Composition and opacity

AOV Composition allows opacity and transparency to carry forward into AOVs. It works only for RGB AOVs, so you won’t see it in the render region (because the xsi display driver always outputs RGBA...

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[MtoA] Editing Arnold attributes on multiple objects

If you need to change the same Arnold attributes on many nodes, use the Attribute Spreadsheet. For example, suppose you wanted to turn off the Opaque attribute on a number of objects in your scene....

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Creating object mask AOVs that include opacity

Create a custom RGB AOV. Use aiWriteColor to write the object mask to the custom AOV. The Input color of the aiWriteColor is the mask color, and you have to enable Blend to get the opacity blended...

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