How do I prevent hair flickering in Cycles? I'm working on a scene for a short film, and one of my characters uses Cycles strand rendering for hair. When I render out the animation, I notice the hair flickers like crazy and I'm not sure why.

Here is the video: https://www.youtube.com/watch?v=oF662SBlZpo

Here is the node setup for his hair:


This becomes VERY apparent when the character is moving and not so much when he is still.
It could be your UV coordinates, which are "generated". Since they are probably calculated in world coordinates, moving the object also moves the UV coordinates. It could cause shimmering "noise".

I don't think your node set up is what you want really. You should use the hair BSDF shader. Put 2 nodes using hair BSDF, one for reflection (hair color), and one for transmission (hair translucency). Mix between them and you are done. Consider creating manual UV coordinates and not using generated ones.

Good luck!