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53 lines (50 loc) · 2.12 KB
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import { math } from '../../math/math.js';
import { AnimBlendTree } from './anim-blend-tree.js';
/**
* @private
* @class
* @name AnimBlendTree1D
* @classdesc An AnimBlendTree that calculates its weights using a 1D algorithm
* based on the thesis http://runevision.com/thesis/rune_skovbo_johansen_thesis.pdf Chapter 6.
* @description Create a new BlendTree1D.
*/
class AnimBlendTree1D extends AnimBlendTree {
constructor(state, parent, name, point, parameters, children, syncAnimations, createTree, findParameter) {
children.sort((a, b) => a.point - b.point);
super(state, parent, name, point, parameters, children, syncAnimations, createTree, findParameter);
}
calculateWeights() {
if (this.updateParameterValues()) return;
var i;
var weightedDurationSum = 0.0;
this._children[0].weight = 0.0;
for (i = 0; i < this._children.length; i++) {
var c1 = this._children[i];
if (i !== this._children.length - 1) {
var c2 = this._children[i + 1];
if (c1.point === c2.point) {
c1.weight = 0.5;
c2.weight = 0.5;
} else if (math.between(this._parameterValues[0], c1.point, c2.point, true)) {
var child2Distance = Math.abs(c1.point - c2.point);
var parameterDistance = Math.abs(c1.point - this._parameterValues[0]);
var weight = (child2Distance - parameterDistance) / child2Distance;
c1.weight = weight;
c2.weight = (1.0 - weight);
} else {
c2.weight = 0.0;
}
}
if (this._syncAnimations) {
weightedDurationSum += c1.animTrack.duration / c1.absoluteSpeed * c1.weight;
}
}
if (this._syncAnimations) {
for (i = 0; i < this._children.length; i++) {
const child = this._children[i];
child.weightedSpeed = child.animTrack.duration / child.absoluteSpeed / weightedDurationSum;
}
}
}
}
export { AnimBlendTree1D };