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So genuine question: Is this kinda taking a cue from Vagrant Story or Paper Mario and games like that where the rim lighting is created by having 2 models, one lighter one below the other and shifted to the left (Or instead of the 2 models some framebuffer masking, shifting, and multiplication?)

It's very close to the vagrant story method of rendering the model to a stencil buffer and offsetting it. @gadgetpatch.bsky.social coded the shaders and did an excellent job as with all her work!

Basically yeah, the model gets rendered twice. The outline pass checks the direction and distance of nearby lights, and scoots each vertex toward it, based on how strong the light is. The outline is also more sensitive to light, intensifying its brightness and saturation, so it stands out!

vesna i would give you ten thousand milk bones