@woosh/meep-engine/src/engine/graphics/ecs/mesh-v2/build_three_object.js

Pure JavaScript game engine. Fully featured and production ready.

import { DrawMode } from "./DrawMode.js";
import { Line, LineSegments, Mesh, Points } from "three";
import { ShadedGeometryFlags } from "./ShadedGeometryFlags.js";

/**
 *
 * @param {ShadedGeometry} sg
 * @returns {THREE.Object3D}
 */
export function build_three_object(sg) {

    /**
     * @type {THREE.Object3D}
     */
    let object;

    const mode = sg.mode;
    const shader = sg.material;
    const geo = sg.geometry;

    if (mode === DrawMode.Triangles) {
        object = new Mesh(geo, shader);
    } else if (mode === DrawMode.Lines) {
        object = new Line(geo, shader);
    } else if (mode === DrawMode.LineSegments) {
        object = new LineSegments(geo, shader);
    } else if (mode === DrawMode.Points) {
        object = new Points(geo, shader);
    } else {
        throw new Error(`Unsupported draw mode '${mode}'`);
    }

    object.matrixAutoUpdate = false;
    object.frustumCulled = false;
    object.matrixWorldNeedsUpdate = false;

    object.castShadow = sg.getFlag(ShadedGeometryFlags.CastShadow);
    object.receiveShadow = sg.getFlag(ShadedGeometryFlags.ReceiveShadow);

    if (sg.depth_material !== null) {
        object.customDepthMaterial = sg.depth_material;
    }

    return object;
}