As a graphics nerd, the handful of times I've had genuine lucid dreaming (when experimenting with it in college) was incredible. In the dream I would would focus on taking in the behavior of light and texture on surfaces and trying to gauge its quality from a computer graphics perspective, and always found the 'simulation' absolutely stunning. I remember encountering a large rabbit once and ran my fingers through it's fur and it felt and looked real. It's mindboggling how well the brain can simulate a fake environment when you go lucid, it's really beyond comprehension to me how it's able to do so. The brain can basically simulate the rendering equation in real time (or trick yourself into thinking it is, which is the same thing really.)