three-stdlib/helpers/RectAreaLightHelper.js

stand-alone library of threejs examples

import { Line, BufferGeometry, Float32BufferAttribute, LineBasicMaterial, Mesh, MeshBasicMaterial, BackSide } from "three";
class RectAreaLightHelper extends Line {
  constructor(light, color) {
    const positions = [1, 1, 0, -1, 1, 0, -1, -1, 0, 1, -1, 0, 1, 1, 0];
    const geometry = new BufferGeometry();
    geometry.setAttribute("position", new Float32BufferAttribute(positions, 3));
    geometry.computeBoundingSphere();
    const material = new LineBasicMaterial({ fog: false });
    super(geometry, material);
    this.light = light;
    this.color = color;
    this.type = "RectAreaLightHelper";
    const positions2 = [1, 1, 0, -1, 1, 0, -1, -1, 0, 1, 1, 0, -1, -1, 0, 1, -1, 0];
    const geometry2 = new BufferGeometry();
    geometry2.setAttribute("position", new Float32BufferAttribute(positions2, 3));
    geometry2.computeBoundingSphere();
    this.add(new Mesh(geometry2, new MeshBasicMaterial({ side: BackSide, fog: false })));
  }
  updateMatrixWorld() {
    this.scale.set(0.5 * this.light.width, 0.5 * this.light.height, 1);
    if (this.color !== void 0) {
      this.material.color.set(this.color);
      this.children[0].material.color.set(this.color);
    } else {
      this.material.color.copy(this.light.color).multiplyScalar(this.light.intensity);
      const c = this.material.color;
      const max = Math.max(c.r, c.g, c.b);
      if (max > 1)
        c.multiplyScalar(1 / max);
      this.children[0].material.color.copy(this.material.color);
    }
    this.matrixWorld.extractRotation(this.light.matrixWorld).scale(this.scale).copyPosition(this.light.matrixWorld);
    this.children[0].matrixWorld.copy(this.matrixWorld);
  }
  dispose() {
    this.geometry.dispose();
    this.material.dispose();
    this.children[0].geometry.dispose();
    this.children[0].material.dispose();
  }
}
export {
  RectAreaLightHelper
};
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