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Rendering with Arnold in CINEMA 4D using the C4DtoA plug-in.
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Matte through Refracted object for example: Glass/ Water etc.

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Message 1 of 3
Adam_Roche
1813 Views, 2 Replies

Matte through Refracted object for example: Glass/ Water etc.

Is it possible to to matte something behind a pane of glass? Normally in C4d you can add an object buffer and it will render out the pass after the refraction, however once set up the matte in Arnold it doesn't seem to pass through. I've tried various AA settings and the opaque check box on the arnold tag on the glass. Thanks for your help in advance - Adam

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Stephen.Blair
in reply to: Adam_Roche

Refraction (aka transmission) doesn't carry through to the alpha. That's something we'll add soon.



// Stephen Blair
// Arnold Renderer Support
Message 3 of 3
Shawn_Kearney1
in reply to: Adam_Roche

Thin glass can be faked if you do not require transmission or refraction. Use Utility with Metal shade node, and pipe into lambert opacity. From there you can adjust fresnel using facing ratio to drive the utility shader's "color" attribute.

Essentially you're using the specular from the utility to drive alpha.

290-screen-shot-2017-10-03-at-43009-pm.png

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