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Transmission is behaving oddly

7 REPLIES 7
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Message 1 of 8
Anonymous
467 Views, 7 Replies

Transmission is behaving oddly

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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7 REPLIES 7
Message 2 of 8
Stephen.Blair
in reply to: Anonymous

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
Message 3 of 8
Anonymous
in reply to: Stephen.Blair

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

Message 4 of 8
Anonymous
in reply to: Stephen.Blair

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

Message 5 of 8
Anonymous
in reply to: Stephen.Blair

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.

Message 6 of 8
Stephen.Blair
in reply to: Anonymous

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



// Stephen Blair
// Arnold Renderer Support
Message 7 of 8
Anonymous
in reply to: Anonymous

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.

Message 8 of 8
Stephen.Blair
in reply to: Anonymous

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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