UPDATE:
It seems, if increasing denoise radius to 25 (it is maximum) - there are much less artifacts (but they are still visible).
Dear friends,
I have a trouble rendering glass (Cycles) for my animation - too much artifacts.
This is 64 samples:
128 samples:
256 samples:
512 samples (the best, but not excellent, artifacts still exist):
Renderring details:
Denoising: enabled - Radius 8, Strengh: 0.5, Feature Strengh: 0.5 (all default options)
Subdivision surface: Render: 3 (if I remove it, it doesn't help)
Thikness: 0.03 (if I remove it, it doesn't help)
Glass: Roughness: 0.2 (if I make it 0, it don't change anything)
Motion blur - Enabled (if I remove it, it doesn't help)
Try the other denoiser (in the Compositor). Renders a lot faster, doesn't give those 'blodges' and 64 Samples will probably enough.
Maybe even 32...
This is an old tutorial but it showed me a great way to render glass without noise in cycles. Give it a watch and see if it helps : https://youtu.be/jNzuXO31qcg?t=1159
Dear Matthew, I see this is the way to create a glass material with a nodes, but how it deals with denoising?
Well that glass material will be much less noisy in the raw render so the denoising will not have to be as high or you may not even need to denoise it at all... Worth a try I would say.