# film One-paragraph description of what this module provides and who consumes it. ## Exports - `M.exampleFn(arg) -> result` — what it does and when to call it. - `M.exampleValue: type` — what value it carries. ## Usage ```luau local M = require("@<youridentity>::modules.film") M.exampleFn("foo") ``` ## Notes - Anything callers need to know about THIS module: required runtime ordering, state ownership, side effects.

# ridge.ground Saddle 3400's massif, as ONE height function sampled into meshes: a col at y = 0 carved west-to-east through a mountain body, shoulders north and south, two rock horns standing out of the cloud at the col's west end, every flank plunging below the deck so the ground never shows an edge, and under the deck the valley floor at y = -900 with its scree fan. ## Exports - `Ground.heightAt(x, z) -> y` — the snow's world height. The answer to "where is the ground" for every other slice; nothing in it reads a clock, so it is the same in every mode and on every run. - `Ground.valleyHeightAt(x, z) -> y` — the floor under the deck. - `Ground.build(root)` / `Ground.pump(n)` / `Ground.isBuilt()` / `Ground.progress()` — the meshing, a few patches a frame. - `Ground.patchGeometry(H, x0, z0, step, nx, nz, skirt?)` — a rectangular patch of any height function, with normals taken from the function itself rather than from the grid, so two patches of different density share a border exactly. ## Notes - Relief belongs to the mountain BODY and to the horns, and `col` cuts a clean channel through whatever they leave standing. Adding relief after the cut lifts the col's west ramp and walls the saddle into a closed bowl, and the cloud deck then has nowhere to show. - Each gun stands on a levelled pad, because `Film.gunPosition` puts its trails at exactly y = 0.