Blender Cycles Baking - Weird Black Artefacts from Denoising around Emissive Glow?

robusgun · Oct 2018

Hi all, I've been working on a glowing light bulb in a dark scene. I seem to run into problems when trying to render with minimal noise, and the main light source being from the mesh light of the filament within the bulb (the only other light source is the HDRI at a very low 0.01, for some nice reflections). I am using Branched Path Tracing with Mesh Light at 3, and I have set Clamp Indirect to 0.5, and I have denoising set to Radius 8, Strength 0.5, Feature Strength 0.5. The render seems to be going great with just a bit of noise that I thought I could get rid of with the denoising feature however when it gets to the denoising it creates this weird black artefacting around the glowing filament and also where the reflected light is strongest on the supporting wires.

THE ISSUE:

The Full Light Bulb Render

Image: https://us.v-cdn.net/5021068/uploads/editor/2e/ol6vjieq95vp.png

Close Up of the Denoising Artefacting

Image: https://us.v-cdn.net/5021068/uploads/editor/za/b9q4hzmjycc0.jpg

THE INFO:Blender Cycles Render Settings

Image: https://us.v-cdn.net/5021068/uploads/editor/7r/ksrzaqq459ym.png

Blender Denoising Settings

Image: https://us.v-cdn.net/5021068/uploads/editor/1t/hka2a0f5ntzi.png

I appreciate any advice. Thanks for looking through this!