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Rendering with Arnold in 3ds Max using the MaxtoA plug-in.
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Using maya + arnold 4.2.13.4 Rendering a shader with opacity in AOV pass. Opacity is not computed at all. Same shader in beauty pass works perfectly. What's the problem?

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Message 1 of 10
Riccardo_Zanettini
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Using maya + arnold 4.2.13.4 Rendering a shader with opacity in AOV pass. Opacity is not computed at all. Same shader in beauty pass works perfectly. What's the problem?

Not sure what's wrong but this looks like and Arnold bug. Opacity is not there at all...

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9 REPLIES 9
Message 2 of 10

more details

opaque uncheked

texture works fine (otherwise beauty won't be working)

Message 3 of 10

not a lot of people helping out in this forum

Message 4 of 10

Hard to tell exactly from that brief problem description, but I think you need to use an ai write color node, and enable Blend



// Stephen Blair
// Arnold Renderer Support
Message 5 of 10

let me rephrase the problem

I have a shader with opacity that is driven by a texture.

If I render that shader in the beauty AOV the transparency is working.

If in the shading group node I plug the same shader in a custom AOV (let's say beauty2) the opacity texture of the shader is ignored and the alpha is solid.

I hope this helps!

Message 6 of 10

When you "plug the same shader in a custom AOV" are you using an ai write color node? Do you enable Blend?



// Stephen Blair
// Arnold Renderer Support
Message 7 of 10

no I am not using a write color node... not sure why I would have to use and ai write color node can you please elaborate?

Message 8 of 10

also does the ai write node need to be plugged into the shading node?

Message 9 of 10

shading group node that is

Message 10 of 10

what you suggested works really well... thank you! I am just puzzled about why this node is necessary, Arnold doesn't process any of the shaders piped into the shading group node other than the surface material?

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