Multi-layered gas giants
Gas giants with 7 cloud layers. All layers are rotate around the planet, from afar it looks like gas flows are moving in opposite directions. The screenshots show a consistent dive to the very "surface".
Theoretically, if one make the atmosphere thicker, so that the horizon will not be visible at all, it should look good. But the Bruneton scattering code tends to be unstable as the haze density increases. Besides, I don't like that the giant looks like the Earth, brightening towards the edge of the disk. Instead, it should look like Lambert-illuminated ball. Maybe I should use a different atmosphere code for gas giants: simpler, but with strong fogging...
The main problem with clouds is that triangles need to be sorted before rendering for correct transparency order. Then it will be possible to add "relief" to the clouds to get a completely usable cheat to render giants from afar.