Diorama Skill

Installation

Prompts

Type /diorama and describe the place. Say where it will live (a hero, a card, a small figure), name the place or the product, and give a colour if you have one. The agent offers two or three concepts, builds the one you pick, runs the validator and the look, and hands you diorama-<name>.html.

Sizes

The size sets the stage, the budget and the tempo.

Themes

A theme is a set of fields the kernel applies to every primitive; a figure never branches on it, so the same file draws five ways. Pick it from where the figure will live.

theme: { base: 'mono', accent: '#f2c230', shadows: false }
theme: { base: 'toy', palette: { coral: '#5b4ae0', grass: '#d8ead0' } }
theme: { base: 'line', round: true, strokeWidth: 1.4 }
theme: { base: 'night', glow: 3, lights: { sun: ['#ffd6a0', .3] } }

Minis

A mini is a small figure, 160 to 240px square: one object and one quiet motion. Use it wherever a page needs a small picture: an empty state, a feature in a list, a settings section, a 404, a sidebar. Its still frame is the picture and the ambient motion is the bonus. The canvas is transparent, so whatever sits behind it shows through. The words around it, a heading, a line, a button, are yours to write in your own UI.

The figure file

One Diorama.figure call: a declaration, a build that makes the scene once with the toolkit and returns the parts that move, and a tick that poses them from ctx.t. No timers, no new THREE.*, no words inside the scene.

Diorama.figure({
  name: 'mailbox',
  size: 'mini',                          // hero | card | mini
  theme: 'toy',                          // or { base: 'line', accent: '#cf6a4c' }
  means: 'An open letterbox with nothing inside. The flag lifts now and then.',
  title: 'Mailbox',
  still: 1,                              // the second reduced motion shows
  build: function (o) {
    var D = o.D, pal = o.pal;
    D.slab(3, 3, pal.grass, 0, 0, 0, null, { h: .5, r: .45, side: pal.base });
    var post = D.group(.15, 0, -.1);
    D.cyl(.07, .09, 1.1, pal.wood, 0, .55, 0, post, 8);
    var body = D.group(0, 1.15, 0, post);
    D.box(.95, .5, .6, pal.coral, 0, .25, 0, body);
    var flag = D.group(.1, .5, .32, body);
    D.box(.26, .16, .03, pal.mustard, .1, .02, 0, flag);
    D.props.tree(1, -.8, null, { r: .42 });
    return { flag: flag };
  },
  tick: function (ctx) {
    var D = ctx.D, t = ctx.t, check = D.smooth(D.pulse(t, 7, .36));
    ctx.parts.flag.rotation.z = D.lerp(.2, 1.45, check);
  }
});

The toolkit: D.box, D.rbox, D.cyl, D.cone, D.ball, D.dome, D.wedge, D.slab, D.torus, D.wheel, D.label; the props tree, bush, rock, cloud, person, lamp, crate, pallet, cone, flag; for motion phase, pulse, wave, the eases, spring, path, place, spin, stagger. The index at the top of kit/diorama.js lists them all.

Scripts

Embed

The built page can be served as is or framed. For a product, keep the kernel and the figure and drop the bench. The kernel sizes the canvas to the element’s width, watches resizes, sleeps offscreen and honours prefers-reduced-motion with one still frame. Remount to change the theme.

<div id="hero" style="width:100%"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
<script src="/diorama/kit/diorama.js"></script>
<script src="/diorama/island.js"></script>
<script>
  var fig = Diorama.figures[Diorama.figures.length - 1];
  var ctx = Diorama.mount(fig, { el: document.getElementById('hero'), theme: 'night' });
</script>

"use client";
import { useEffect, useRef } from "react";
import * as THREE from "three";          // npm i three@0.128
import Diorama from "./diorama.js";
import "./island.js";                   // registers the figure

export function Hero({ theme = "toy" }) {
  const el = useRef<HTMLDivElement>(null);
  useEffect(() => {
    const fig = Diorama.figures[Diorama.figures.length - 1];
    const ctx = Diorama.mount(fig, { el: el.current!, THREE, theme });
    return () => ctx.destroy();
  }, [theme]);
  return <div ref={el} style={{ width: "100%", aspectRatio: "3 / 2" }} aria-hidden />;
}

Craft rules

Ten rules separate a diorama from a pile of cubes: the world stands on a rounded base with its zones inside the corners; the camera is true isometric, subject front-left; the palette is pale with two or three accents and one named accent; materials are matte blocks, no textures; every object is a few primitives with the two or three features that give it away; one sun and soft shadows under everything; all motion comes from the clock in tick; vehicles ride paths on a schedule with stops that have a cause; a few loops with different tempos and one rare thing; and no words inside the scene. The long form, with recipes, is in references/craft.md.

What is in the skill