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falling-leaves

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Build falling leaves that read as leaves, with each one tumbling on its own axis so it presents a face, thins to an edge, and opens out again, and with its sideways slip driven by that same tumble. Covers the 2-D canvas build and the instanced-3-D variant, where leaves are recycled from, density-versus-count maths, depth layering, colour under a tone-mapped composite, reduced motion, and visibility pausing. Use for autumn maple, sakura petals, blossom, ash, snowfall shapes, or any drifting foliage where a generic particle field reads as confetti.

skills-imported/falling-leaves/SKILL.md

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Oct 10, 2026
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# Falling Leaves

Make the falling thing read as a leaf. Reach for `ambient-section-particles` when you want a bounded atmosphere of generic motes. Reach for this when the shape has to be recognisable.

## Build the tumble first

Turn each leaf about its own long axis so it shows its face, thins to nothing edge-on, then opens out on the other side. That instant of near-disappearance is what the eye reads as "leaf". A sprite that only spins in the picture plane reads as confetti, a coin, or a paper scrap, however good the artwork is.

On 2-D canvas the tumble is a horizontal scale that crosses zero:

```js
ctx.save();
ctx.translate(l.x, l.y);
ctx.rotate(l.roll);              // long axis drifting in-plane
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