# crater Stands the place and drives it from the film clock. ```lua local crater = require("ashbloom.crater.crater") crater.build() -- idempotent: meshes, materials, entities, anchors crater.ashCoverage(t) -- 1 -> 0 as the rain crosses crater.waterY(t) -- where the pool's surface is crater.state(t) -- what it is doing now, including the LIVE uniforms ``` Requiring this module registers the `crater` stage, so the director poses the place once a frame with everything else. ## What `build` does Makes the four materials and the seven meshes it is missing, spawns the geometry under a `Crater` entity, deletes the skeleton's scaffold rings, and moves the `A_*` shot anchors onto the surface the real geometry built — keeping each one's azimuth, so the compositions the shot list was written against still hold. It is idempotent and safe after a hot-reload. `teardown()` takes the geometry down and marks every mesh for re-cutting, which is what the component's `rebuild` field uses when the generator itself changes. ## What it drives Two numbers, pushed into the crater's materials every frame: - `ash_coverage` — `ashCoverage(t)`, 1 through movement I and stripped to 0 between t 42 and t 60. The ash mantle reads it as how much of itself is still lying; the stone reads it as how much dust is still in its joints. - `wetness` — `film.wetness(t)`, 0 to 0.78. Basalt goes from dry grey to near-black with a grazing sheen, water gathers in the low places, and ash that is still lying holds the water off the stone under it. ## What other slices ask it `waterY(t)` is where the pool's surface stands — −2.25 in the dry basin, rising to −0.30 just under the kerb as the rain fills it. The refractive pool plane follows it. `CHANNEL_ANGLES` are the four bearings the stone channels run on; `A_Channel` stands at the first.