Every time I use glass material in Cycles render with diffuse or any other material with the help of mix shader, I always see 'fireflies' (small random illuminated pixels). I have already tried removing caustics after following BlenderGuru.
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2Play with the settings for Clamp Indirect see: https://blender.stackexchange.com/questions/96101/problems-with-denoising-in-rendering/97491#97491 – Jun 29 '18 at 15:01
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2Read also Will increasing samples reduce fireflies? and How to reduce fireflies in cycles – Jun 29 '18 at 15:02
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1Have you tried enabling denoising? (found under the Render Layers panel) – Medhir Bhargava Aug 28 '18 at 06:47
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What helped me most times is increasing the size of the light source. At default, e.g. point lamps have a size of 0.1 units, so when calculating caustics blender just has rounding errors, I guess.
Of course, raising the size of your light source higher and higher will produce softer and softer shadows, so you have to play with the values.
Another guess: Don't lighten your scene with objects with emission materials alone – they will not produce enough light. Add standard point or area lights where necessary.
Grimm
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