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With special guest Nathan Vegdahl!
Here's a link to the shimmering harbor assets I was using.
Also related: Refractions and Heat Shimmers
And the OSL series from CG Matter! It was absolutely fantastic (even if it turns out OSL isn't exactly what I thought it was)
ALSO ALSO- I was wrong in the video, it's not a special build of blender (I thought I had to use one at first)- it's just Blender 4.0 alpha version, which includes the viewport compositing!