Nice to see someone try raytraced cubemaps, been wondering about the idea for a while.
Machine Learning Summit: Real-Time Neural Texture Upsampling in 'God of War Ragnarok'
This talk gives a detailed breakdown of the run-time neural texture upsampling system in God of War Ragnarkincluding how the networks are designed to directly output BC compressed image blocks, how the process is optimized to take full advantage...www.gdcvault.com
EDIT:
Upsampling was interesting as well.
Reminded about the bicubic upsampling of virtual textures in Rage.
Should work nicely in such case.