Very interesting LoRA. Of course the model can know nothing about actual ray-tracing, nor does it need to do so. Instead, like an actual Human artist of yore, it FAKES the effect to an extent that looks sort of real to our brains, but under rigorous mathematical analysis would be shown to be wholly incorrect.

It is wonderful just how good AI lighting effects seem to be (like reflections and shadows), when in reality they are just very clever fakes.

Isn't that what gpus normally do?

We've gone full circle!