Transmission is behaving oddly

Transmission is behaving oddly

Anonymous
Not applicable
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Message 1 of 8

Transmission is behaving oddly

Anonymous
Not applicable

When I render a sequence, the look of the transmission on an object changes randomly depending on the frame. I've rendered more than once and the change happens on different frames. Any idea what would cause this?

Look 1

Look 2

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Message 2 of 8

Stephen.Blair
Community Manager
Community Manager

What is changing between frames? I don't mean the transmission, but is the lighting changing? Are things moving? Or is it a static scene, no animation?



// Stephen Blair
// Arnold Renderer Support
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Message 3 of 8

Anonymous
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The camera is slowly pushing in, otherwise nothing is changing in the scene. Did the image links work? I'm not able to click on them..

Here are urls just in case-

https://ibb.co/QmbrPKM

https://ibb.co/g90WWhL

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Message 4 of 8

Anonymous
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Also just did a test without a camera move, same issue..

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Message 5 of 8

Anonymous
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Sorry just updating with some troubleshooting I've been doing. I put the shader on a plane to see if it might be an issue with the geo, and it did the same thing.

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Message 6 of 8

Stephen.Blair
Community Manager
Community Manager

@Michael Sime Please upload a simple scene that shows the problem.



// Stephen Blair
// Arnold Renderer Support
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Message 7 of 8

Anonymous
Not applicable

Ok so I found the issue, just not sure why it caused it. I had an image map for the transmission weight, once I removed that connection and used a flat number it rendered correctly. I'll have to handle the weight in post. But thank you so much for your help, even offering to look at the scene file. I really appreciate it.

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Message 8 of 8

Stephen.Blair
Community Manager
Community Manager

Maybe we were reading different mipmap resolutions on different frames...

An Info-level Arnold log would show what mipmap levels were being used.



// Stephen Blair
// Arnold Renderer Support
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