zyme_scorch

The mark the face-plate's beam leaves on a plot once the bloom has hissed off it — a ragged disc of soot and pale ash with embers still alive in the cracks.

It is a stain, so it shades itself: it reads the sun's colour and intensity and the ambient off FragmentData and multiplies the soot by them, which keeps the mark sitting in whatever light the hillside is under without the engine lighting a card that has no volume. Nothing else it draws is lit — the ember term is added on top and goes out as the mark cools.

The disc's boundary is inner..outer in plot half-widths, displaced by ragged × fbm noise, so no two marks are the same circle. opacity fades the whole card, which is what lets the mark arrive over a second rather than appearing between frames.