Yesterday I got sidetracked while blocking some environments by Cycles volumetric light scatter material. It was just last month that a new workstation came in allowing for 12 render threads so I wanted to test the material for practicality in rendering a video. Short answer… nope. Reading through the render engines documentation and spending nearly a whole day changing settings and preview rendering resulted disappointing. It seems even in the latest version noise is still far too big of a problem. Setting volumetric to 8192 samples with various speed enhancements with light paths, branched tracing and algorithm types still gave mediocre results that took all night to render. And we are talking a Linux machine built for rendering.
Thinking about this problem we should wonder why this information cant be baked into a voxel grid. It makes me wish I was more knowledgeable on light physics, there must be some way that could work.
Apart from that I also came on this recently. Have never been a fan of Cycles rough glossy shader but never knew it was this bad. Discovering that Blenders “Linear” shading isn’t really linear at all will definitely change the way I handle shading network from now on. According to the article putting your gloss info through a math node set to “Power” with a value of 2.2 helps this problem somewhat.