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Eden Soto avatar image
Eden Soto asked ·

Transmission transparency issue

(relevant screenshots attached below)

Have a clear glass lid on this turntable and the issue I'm running into is when I try and output an alpha, the lid is not outputting any transparency. I've tried several things like:

  1. Deselected the "Opaque" option in the Arnold tag
  2. Set "Camera" and "Transmission" visibility of the sky dome to 0
  3. Nothing is in frame behind the object
  4. Tried reversing the normals of the lid
  5. Tried adjusting the IOR for the lid
  6. Tried upping the ray depth for Transmission, Transparency depth, etc.

Nothing I'm trying seems to be getting the lid transparency to output on the alpha. As you can see in my screenshot, in the composite, the glass looks fine.

There is an image controlling specularity of the lid (scuff marks), but even if I drop that off the shader, I still don't get transparency on the alpha.

I've pretty much run out of things to try, so would love to pick someone else's brain on this one.

Thanks!

transmissionglasstransparency
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Stephen Blair avatar image
Stephen Blair answered ·

Transmit AOVs?

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Eden Soto avatar image
Eden Soto answered ·

Noticed some other weird results as well... I have a shadow_matte under the turntable and I'm noticing that through the glass material, the shadows on the floor object with the shadow_matte are getting cut off in the alpha channel when the glass is in front of it... in the composite, it doesn't happen


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Eden Soto avatar image
Eden Soto answered ·

So yah, for the most part, that Transmit AOVs did the trick, but there's a minor issue leftover in that where the glass is at certain angles, it's coming out almost black... if you have any thoughts on that, would appreciate it... I've tried (again) with ray depth and other settings, but can't seem to figure out why that's happening... I can live with it as-is, but would be cool if I can resolve that.


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