lingo3d/lib/engine/physx/computeMergedPxVertices.js

Lingo3D is a React/Vue 3d game development framework that ships with a complete visual editor

import * as BufferGeometryUtils from "three/examples/jsm/utils/BufferGeometryUtils";
import { physxPtr } from "../../pointers/physxPtr";
export default (manager) => {
    const { Vector_PxVec3 } = physxPtr[0];
    const geometries = [];
    const loaded = "$loadedObject3d" in manager
        ? manager.$loadedObject3d
        : manager.object3d;
    loaded.updateMatrixWorld();
    const { position, rotation } = manager.outerObject3d;
    loaded.traverse((c) => {
        if (!("geometry" in c))
            return;
        const clone = c.geometry.clone();
        clone.applyMatrix4(c.matrixWorld);
        clone.translate(-position.x, -position.y, -position.z);
        clone.rotateX(-rotation.x);
        clone.rotateY(-rotation.y);
        clone.rotateZ(-rotation.z);
        for (const key of Object.keys(clone.attributes))
            key !== "position" && clone.deleteAttribute(key);
        clone.dispose();
        geometries.push(clone);
    });
    const geometry = BufferGeometryUtils.mergeBufferGeometries(geometries);
    geometry.dispose();
    const buffer = geometry.attributes.position;
    const vertices = buffer.array;
    const vec3Vector = new Vector_PxVec3(buffer.count);
    for (let i = 0; i < buffer.count; i++) {
        const pxVec3 = vec3Vector.at(i);
        const offset = i * 3;
        pxVec3.set_x(vertices[offset]);
        pxVec3.set_y(vertices[offset + 1]);
        pxVec3.set_z(vertices[offset + 2]);
    }
    return [vec3Vector, buffer.count, geometry.index];
};
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