Reflection pixel problem

[emmo89]

Hi,
i'm trying to render a glass object and composite it with the background with shadow catcher. I don't know why but i get this aliased reflection in the highlights. I searched in the forum but i didn't find the right solution to this. How can i get rid of it?

[maru]

Hi, this should help:
https://coronarenderer.freshdesk.com/support/solutions/articles/5000515615

You are getting these fireflies in the rendering, not after compositing - right?

[FrostKiwi]

Hi,
i'm trying to render a glass object and composite it with the background with shadow catcher. I don't know why but i get this aliased reflection in the highlights. I searched in the forum but i didn't find the right solution to this. How can i get rid of it?

thats because its not reflection, but refraction noise. You have complex normals breaking and creating aliasing.
Either lower IOR, refract only one side or turn down AAvsRays and sample the crap out of it