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?
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-
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.
@Michael Sime Please upload a simple scene that shows the problem.
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.
Maybe we were reading different mipmap resolutions on different frames...
An Info-level Arnold log would show what mipmap levels were being used.