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melonjs-lighting

Use this skill for 2D dynamic lighting in melonJS — Light2d, ambient light on a Stage, multiple lights, and per-pixel normal-mapped sprites authored in SpriteIlluminator. Covers specular highlights via shininess, the ambient-cutout model, which parts need a GPU backend, and why Light2d does not survive a Camera3d. Triggers on: Light2d, specular, shininess, highlight, glint, lighting, ambientLight, ambientLightingColor, normalMap, SpriteIlluminator, per-pixel lighting, drawLight, torch, glow, darkness.

packages/melonjs/skills/melonjs-lighting/SKILL.md

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# 2D dynamic lighting

> `Light2d` is a world renderable that cuts through a stage's ambient darkness.
> The glow and the cutout work on every backend; only per-pixel normal-map
> shading needs a GPU one. It is 2D-only.

## The model: ambient darkness plus cutouts

The `Stage` holds an ambient colour — a dark sheet painted over the scene after
the world is drawn — and each active `Light2d` punches a hole in it at its
visible area. The lights themselves are drawn additively on top.

```js
class PlayScreen extends Stage {