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Rendering with Arnold in 3ds Max using the MaxtoA plug-in.
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aiMatte and Refraction with Glass

8 REPLIES 8
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Message 1 of 9
paul.sheehyECZEJ
474 Views, 8 Replies

aiMatte and Refraction with Glass

Hi everyone,

I have a BG plate that is behind a glass material but when I render, the BG plate is rendering black. What would be the most efficient way to get this to show through the glass?

I have an aiMatte on the BG plate.

Thanks,

Paul

8 REPLIES 8
Message 2 of 9

aiMatte is visible to camera rays only

what if you connect something to the passthrough?



// Stephen Blair
// Arnold Renderer Support
Message 3 of 9

Ah that would explain it, thanks. I will give that a shot.

Am I better to use a aiStandardSurface shader? The reason I used the aiMatte is because I do not want this plate contributing any lighting or receiving any light from the scene.

Message 4 of 9

Hi Stephen,

When I plugged the same output into the passthrough it was kind of working, but wasn't showing the alpha in the BG plate (or the cut-out)

The image could be seen through the glass though, just withoug the alpha in effect.

Message 5 of 9

You could make the object visible to camera and transmission rays only. Then it won't contribute any indirect lighting.

A utility shader in flat mode doesn't use any lighting.



// Stephen Blair
// Arnold Renderer Support
Message 6 of 9

Hi again, this is just a follow up on this.

When I render an object with a glass shader applied, is it possible to have the alpha of the object respecting the glass? So it could be composited on any background in Nuke for example. At the moment, I am just seeing a solid white alpha.

Message 7 of 9

Please ignore this last question. Turning on Transmit AOVs did exactly what I want.

Message 8 of 9

Transmit AOVs link here.

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 9 of 9

Thanks a mill Lee

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