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import * as THREE from 'three';
import { RoomEnvironment } from 'three/addons/environments/RoomEnvironment.js';
/**
* The "look" of the scene, as opposed to the character's shape: body colours,
* mirroring, shadows and the lighting environment.
*
* These all live here rather than in `main.js` because they are a *policy* about
* how the model should be presented, and they need to be re-applied as a group
* whenever any of them changes. `main.js` only has to call `apply()`.
*
* Two things are worth knowing:
*
* - Colours are written onto the model's ORIGINAL materials. The flat/toon
* style caches its own materials derived from them, so `styles.refreshColors()`
* has to be called afterwards or the toon shading keeps the old colour.
*
* - Shadow softness is `LightShadow.radius` with a PCF soft shadow map, plus a
* hand-drawn contact blob for the "ground shadow only" mode. (VSM was tried
* for its wider blur and cut the shadow off in a straight line where it met
* the feet - see the note in `apply`.)
*/
export const ENVIRONMENTS = [
{ value: 'gradient', label: 'スタジオ（明るい）' },
{ value: 'room', label: '室内（自然な反射）' },
{ value: 'none', label: 'なし（のっぺり）' },
];
/** Material name -> which entry of `render.colors` it takes. */
const PART_COLORS = {
blb: 'body',
Hand: 'accent',
Foots: 'feet',
Nose: 'nose',
Leaf: 'leaf',
Vein: 'vein',
};
const clamp01 = (value) => Math.min(1, Math.max(0, Number(value) || 0));
/**
* A soft blob that sits under the feet: the shadow a toy would cast on a table.
* It is a plain plane with a radial gradient, so it is cheap and it works in the
* line-art styles too, where the real shadow map is switched off.
*/
function makeContactShadow(size) {
const canvas = document.createElement('canvas');
canvas.width = 128;
canvas.height = 128;
const ctx = canvas.getContext('2d');
const gradient = ctx.createRadialGradient(64, 64, 4, 64, 64, 62);
gradient.addColorStop(0, 'rgba(0,0,0,0.55)');
gradient.addColorStop(0.55, 'rgba(0,0,0,0.28)');
gradient.addColorStop(1, 'rgba(0,0,0,0)');
ctx.fillStyle = gradient;
ctx.fillRect(0, 0, 128, 128);
const texture = new THREE.CanvasTexture(canvas);
texture.colorSpace = THREE.SRGBColorSpace;
const material = new THREE.MeshBasicMaterial({
map: texture,
transparent: true,
depthWrite: false,
toneMapped: false,
});
const mesh = new THREE.Mesh(new THREE.PlaneGeometry(1, 1), material);
mesh.rotation.x = -Math.PI / 2;
mesh.renderOrder = -0.5;
mesh.userData.isHelper = true;
mesh.name = 'contact-shadow';
mesh.scale.setScalar(Math.max(1, size.x) * 1.15);
return mesh;
}
export function createLook({ renderer, scene, styles, model, ground, key, character, gradientEnvironment }) {
const pmrem = new THREE.PMREMGenerator(renderer);
const roomEnvironment = pmrem.fromScene(new RoomEnvironment(), 0.06).texture;
const contact = makeContactShadow(model.size);
scene.add(contact);
const environmentFor = (name) => {
if (name === 'room') return roomEnvironment;
if (name === 'none') return null;
return gradientEnvironment ?? null;
};
function applyColors(colors) {
if (!colors) return;
let touched = false;
for (const mesh of model.parts.body) {
const material = styles.originals.get(mesh) ?? mesh.material;
const part = PART_COLORS[material?.name];
if (!part || !colors[part]) continue;
if (!material.color) material.color = new THREE.Color();
material.color.set(colors[part]);
touched = true;
}
// The toon materials are cached copies, so they need the same edit.
if (touched) styles.refreshColors?.();
return touched;
}
return {
contact,
/**
* @param {object} render `state.render`
* @param {{ line?: boolean }} [context] `line` is true in the line-art
* styles, where shadows and reflections are deliberately switched off.
*/
apply(render, { line = false } = {}) {
if (!render) return;
applyColors(render.colors);
// Mirroring by negative scale is safe: the renderer flips the winding for
// a negative determinant, and the normals go through the inverse-transpose.
character.scale.x = render.mirror ? -1 : 1;
const wantsShadow = render.shadow !== false && !line;
const blobOnly = render.contactShadow === true;
ground.visible = wantsShadow && !blobOnly;
ground.material.opacity = clamp01(render.shadowOpacity ?? 0.22);
key.castShadow = wantsShadow && !blobOnly;
key.shadow.needsUpdate = true;
// The blob is drawn in BOTH modes. On its own it *is* the shadow (the
// "ground shadow only" setting); with the shadow map on it fills the gap
// where the body hides its own shadow right at the feet, which otherwise
// reads as "the shadow is cut off". It is the only thing keeping the
// character looking like it is standing on the floor rather than above it.
contact.visible = wantsShadow;
contact.material.opacity = clamp01((render.shadowOpacity ?? 0.22) * (blobOnly ? 2.6 : 1.6));
const spread = Math.max(0.2, (model.size.x * 1.15) / Math.max(0.05, render.shadowSoftness ?? 1.6));
contact.scale.setScalar(Math.max(0.5, model.size.x * 1.35 - spread * 0.25));
contact.position.y = 0.012;
const softness = Number(render.shadowSoftness) || 1.6;
// PCF, always. three 0.186 removed PCFSoftShadowMap (asking for it warns and
// falls back to this anyway), and VSM needs a depth-variance bias that cut
// the shadow away in a straight line right at the feet. `radius` is what
// softens PCF.
if (renderer.shadowMap.type !== THREE.PCFShadowMap) {
renderer.shadowMap.type = THREE.PCFShadowMap;
// Every shadow-receiving material has to be recompiled for the switch.
ground.material.needsUpdate = true;
for (const mesh of model.parts.body) {
const material = mesh.material;
if (Array.isArray(material)) material.forEach((m) => { m.needsUpdate = true; });
else if (material) material.needsUpdate = true;
}
}
// PCF's radius is in *shadow map texels*, and the map covers about 15 world
// units, so a radius of 1-2 is invisible. This scales it into something the
// eye can see without the sampling turning into noise.
if ('radius' in key.shadow) key.shadow.radius = Math.max(0.5, softness * 5);
const environment = line ? null : environmentFor(render.environment);
if (scene.environment !== environment) scene.environment = environment;
if ('environmentIntensity' in scene) {
scene.environmentIntensity = Number(render.envIntensity ?? 1);
}
},
/** The colours a theme would set, as a plain `{ part: '#rrggbb' }`. */
palette(theme) {
return { ...(theme?.colors ?? {}) };
},
dispose() {
contact.geometry.dispose();
contact.material.map?.dispose();
contact.material.dispose();
contact.removeFromParent();
roomEnvironment.dispose();
pmrem.dispose();
},
};
}
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