@three.ez/instanced-mesh/src/core/feature/Morph.js

Enhanced InstancedMesh with frustum culling, fast raycasting (using BVH), sorting, visibility management and more.

import { DataTexture, FloatType, Mesh, RedFormat } from 'three';
import { InstancedMesh2 } from '../InstancedMesh2.js';
const _tempMesh = new Mesh();
InstancedMesh2.prototype.getMorphAt = function (id, object = _tempMesh) {
    const objectInfluences = object.morphTargetInfluences;
    const array = this.morphTexture.source.data.data;
    const len = objectInfluences.length + 1; // All influences + the baseInfluenceSum
    const dataIndex = id * len + 1; // Skip the baseInfluenceSum at the beginning
    for (let i = 0; i < objectInfluences.length; i++) {
        objectInfluences[i] = array[dataIndex + i];
    }
    return object;
};
InstancedMesh2.prototype.setMorphAt = function (id, object) {
    const objectInfluences = object.morphTargetInfluences;
    const len = objectInfluences.length + 1;
    if (this.morphTexture === null && !this._parentLOD) {
        this.morphTexture = new DataTexture(new Float32Array(len * this._capacity), len, this._capacity, RedFormat, FloatType);
    }
    const array = this.morphTexture.source.data.data;
    let morphInfluencesSum = 0;
    for (const objectInfluence of objectInfluences) {
        morphInfluencesSum += objectInfluence;
    }
    const morphBaseInfluence = this._geometry.morphTargetsRelative ? 1 : 1 - morphInfluencesSum;
    const dataIndex = len * id;
    array[dataIndex] = morphBaseInfluence;
    array.set(objectInfluences, dataIndex + 1);
    this.morphTexture.needsUpdate = true;
};
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