pub const HEAT: [u16; 16];Expand description
The heat ramp a tile or square is painted with, by level: level k means the block or cell ran between 2^(k-1)
and 2^k - 1 engine cycles in the last frame (level 0: not at all) — a frame holds at most
panel_frame_samples engine cycles, so 14 is the hottest a frame reaches. Dark blue through cyan, green,
yellow and orange to red.