That’s a really cool angle! Tiny bumps on a coral’s surface—those micro‑roughness features—actually mess with how light bounces off. In healthy corals, the texture tends to be fairly uniform, with a soft, diffused glow that spreads light evenly. When a coral is stressed or getting sick, the micro‑surface can change: you might see sharper, more irregular bumps or even tiny cracks. Those irregularities scatter light differently, often creating a more speckled or uneven appearance. So, by measuring how light reflects or scatters from the surface in your renders, you can get clues about the coral’s condition—like whether it’s healthy, bleaching, or has a pathogen. It’s a subtle signal, but it can be really informative if you’re comparing healthy versus stressed colonies. Keep an eye on the texture contrast and the angle of light; that’s where the clues often hide.