playcanvas
Version:
Open-source WebGL/WebGPU 3D engine for the web
49 lines (48 loc) • 1.72 kB
JavaScript
import { Vec2 } from "../../../core/math/vec2.js";
import { math } from "../../../core/math/math.js";
import { AnimBlendTree } from "./anim-blend-tree.js";
class AnimBlendTreeCartesian2D extends AnimBlendTree {
static _p = new Vec2();
static _pip = new Vec2();
pointDistanceCache(i, j) {
const pointKey = `${i}${j}`;
if (!this._pointCache[pointKey]) {
this._pointCache[pointKey] = this._children[j].point.clone().sub(this._children[i].point);
}
return this._pointCache[pointKey];
}
calculateWeights() {
if (this.updateParameterValues()) return;
let weightSum, weightedDurationSum;
AnimBlendTreeCartesian2D._p.set(...this._parameterValues);
weightSum = 0;
weightedDurationSum = 0;
for (let i = 0; i < this._children.length; i++) {
const child = this._children[i];
const pi = child.point;
AnimBlendTreeCartesian2D._pip.set(AnimBlendTreeCartesian2D._p.x, AnimBlendTreeCartesian2D._p.y).sub(pi);
let minj = Number.MAX_VALUE;
for (let j = 0; j < this._children.length; j++) {
if (i === j) continue;
const pipj = this.pointDistanceCache(i, j);
const result = math.clamp(1 - AnimBlendTreeCartesian2D._pip.dot(pipj) / pipj.lengthSq(), 0, 1);
if (result < minj) minj = result;
}
child.weight = minj;
weightSum += minj;
if (this._syncAnimations) {
weightedDurationSum += child.animTrack.duration / child.absoluteSpeed * child.weight;
}
}
for (let i = 0; i < this._children.length; i++) {
const child = this._children[i];
child.weight = child._weight / weightSum;
if (this._syncAnimations) {
child.weightedSpeed = child.animTrack.duration / child.absoluteSpeed / weightedDurationSum;
}
}
}
}
export {
AnimBlendTreeCartesian2D
};