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import * as THREE from 'three';
import { TransformControls } from 'three/addons/controls/TransformControls.js';
/**
* Posing. Each bone is driven as a rotation *relative to its rest pose*, so
* every bone reads 0/0/0 in the original stance and a saved pose stays valid
* even if the model is re-exported with different bone orientations.
*
* `bone.quaternion = rest * delta` and `delta = rest⁻¹ * quaternion`, with the
* delta expressed as XYZ Euler angles in degrees for the UI.
*/
const RAD = Math.PI / 180;
const DEG = 180 / Math.PI;
/** three sanitises node names, so `armsupport.l` arrives as `armsupportl`. */
const normalizeName = (name) => (name ?? '').replace(/[.\s]/g, '').toLowerCase();
export class Rig {
constructor({ bones, scene, camera, domElement, orbit, pickTargets, onChange = null }) {
this.bones = bones;
this.byName = new Map();
for (const entry of bones) {
this.byName.set(entry.name, entry);
const alias = normalizeName(entry.name);
if (!this.byName.has(alias)) this.byName.set(alias, entry);
}
this.scene = scene;
this.domElement = domElement;
this.orbit = orbit;
this.pickTargets = pickTargets;
this.onChange = onChange;
this.selected = null;
this.controls = new TransformControls(camera, domElement);
this.controls.setMode('rotate');
this.controls.setSpace('local');
this.controls.setSize(0.8);
this.helper = this.controls.getHelper();
this.helper.visible = false;
// Whether the user wants the gizmo at all. It starts OFF: the model is the
// point, and the rings sat on top of it until you went looking for them.
// Selecting a bone must not switch it back on by itself, so `select()`
// consults this instead of always showing the helper.
this.gizmoWanted = false;
scene.add(this.helper);
this.controls.addEventListener('dragging-changed', (event) => {
this.orbit.enabled = !event.value;
});
this.controls.addEventListener('objectChange', () => {
if (this.selected) this.onChange?.(this.selected);
});
this.raycaster = new THREE.Raycaster();
this.pointer = new THREE.Vector2();
this.pressAt = null;
this.onPointerDown = this.handlePointerDown.bind(this);
this.onPointerUp = this.handlePointerUp.bind(this);
domElement.addEventListener('pointerdown', this.onPointerDown);
domElement.addEventListener('pointerup', this.onPointerUp);
}
/* ------------------------------------------------------------ selection */
select(name, { silent = false } = {}) {
if (name && !this.byName.has(name)) return;
this.selected = name ?? null;
if (name) {
this.controls.attach(this.byName.get(name).bone);
this.helper.visible = this.gizmoWanted;
} else {
this.controls.detach();
this.helper.visible = false;
}
if (!silent) this.onChange?.(this.selected);
}
selectAt(event) {
const rect = this.domElement.getBoundingClientRect();
this.pointer.set(
((event.clientX - rect.left) / rect.width) * 2 - 1,
-((event.clientY - rect.top) / rect.height) * 2 + 1,
);
this.raycaster.setFromCamera(this.pointer, this.controls.camera);
const targets = this.pickTargets().filter((mesh) => mesh.visible);
const hits = this.raycaster.intersectObjects(targets, false);
if (!hits.length) return null;
const point = hits[0].point;
let best = null;
let bestDistance = Infinity;
const world = new THREE.Vector3();
for (const entry of this.bones) {
entry.bone.getWorldPosition(world);
const distance = world.distanceToSquared(point);
if (distance < bestDistance) {
bestDistance = distance;
best = entry.name;
}
}
if (best) this.select(best);
return best;
}
handlePointerDown(event) {
// Remember where the press started so a drag never changes the selection.
this.pressAt = { x: event.clientX, y: event.clientY, axis: this.controls.axis };
}
handlePointerUp(event) {
const press = this.pressAt;
this.pressAt = null;
if (!press || press.axis) return; // pressed on the gizmo, not the model
if (Math.hypot(event.clientX - press.x, event.clientY - press.y) > 4) return;
this.selectAt(event);
}
/* ----------------------------------------------------------------- pose */
getDelta(name) {
const entry = this.byName.get(name);
if (!entry) return { x: 0, y: 0, z: 0 };
const delta = entry.rest.clone().invert().multiply(entry.bone.quaternion);
const euler = new THREE.Euler().setFromQuaternion(delta, 'XYZ');
return { x: euler.x * DEG, y: euler.y * DEG, z: euler.z * DEG };
}
setDelta(name, { x = 0, y = 0, z = 0 }) {
const entry = this.byName.get(name);
if (!entry) return;
const delta = new THREE.Quaternion().setFromEuler(
new THREE.Euler(x * RAD, y * RAD, z * RAD, 'XYZ'),
);
entry.bone.quaternion.copy(entry.rest).multiply(delta);
}
/** `pose.bones` maps a bone name to `[x, y, z]` degrees; `pose.root` is a translation. */
applyPose(pose = {}) {
// Presets and saved files use the glTF bone names (`armsupport.l`) while
// three sanitises them to `armsupportl`, so compare on the normalised form -
// otherwise every preset that touches an arm or leg is silently ignored.
const rotations = new Map();
for (const [key, value] of Object.entries(pose.bones ?? {})) {
rotations.set(normalizeName(key), value);
}
for (const entry of this.bones) {
const value = rotations.get(normalizeName(entry.name));
if (Array.isArray(value)) this.setDelta(entry.name, { x: value[0], y: value[1], z: value[2] });
else this.setDelta(entry.name, { x: 0, y: 0, z: 0 });
}
}
getPose({ onlyMoved = true } = {}) {
const rotations = {};
for (const entry of this.bones) {
const { x, y, z } = this.getDelta(entry.name);
const rounded = [round1(x), round1(y), round1(z)];
if (onlyMoved && rounded.every((value) => value === 0)) continue;
rotations[entry.name] = rounded;
}
return { bones: rotations };
}
reset(name) {
if (name) {
this.setDelta(name, { x: 0, y: 0, z: 0 });
return;
}
for (const entry of this.bones) this.setDelta(entry.name, { x: 0, y: 0, z: 0 });
}
/** True when every bone sits at its rest rotation. */
isRestPose() {
return this.bones.every((entry) => {
const { x, y, z } = this.getDelta(entry.name);
return Math.abs(x) < 0.01 && Math.abs(y) < 0.01 && Math.abs(z) < 0.01;
});
}
setGizmoVisible(visible) {
this.gizmoWanted = visible !== false;
this.helper.visible = this.gizmoWanted && this.selected != null;
}
dispose() {
this.domElement.removeEventListener('pointerdown', this.onPointerDown);
this.domElement.removeEventListener('pointerup', this.onPointerUp);
this.controls.detach();
this.controls.dispose();
this.helper.removeFromParent();
}
}
const round1 = (value) => Math.round(value * 10) / 10;
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