@polygonjs/polygonjs/src/engine/nodes/obj/utils/helpers/HemisphereLightHelper.ts

node-based WebGL 3D engine https://polygonjs.com

// import {Color} from 'three';
// import {OctahedronBufferGeometry} from 'three';
// import {BufferAttribute} from 'three';

// import {HemisphereLightObjNode} from '../../HemisphereLight';
// import {Quaternion} from 'three';
// import {Vector3} from 'three';
// import {BaseLightHelper} from './_BaseLightHelper';
// import {HemisphereLight} from 'three';
// import {Mesh} from 'three';

// export class HemisphereLightHelper extends BaseLightHelper<Mesh, HemisphereLight, HemisphereLightObjNode> {
// 	createObject() {
// 		return new Mesh();
// 	}
// 	private _geometry = new OctahedronBufferGeometry(1);

// 	protected buildHelper() {
// 		this._geometry.rotateZ(Math.PI * 0.5);

// 		this._material.vertexColors = true;

// 		const position = this._geometry.getAttribute('position');
// 		const colors = new Float32Array(position.count * 3);

// 		this._geometry.setAttribute('color', new BufferAttribute(colors, 3));
// 		this._object.geometry = this._geometry;
// 		this._object.material = this._material;
// 		this._object.matrixAutoUpdate = false;
// 	}

// 	// private _inverse_position = new Vector3();
// 	private _quat = new Quaternion();
// 	private _default_position = new Vector3(0, 1, 0);
// 	private _color1 = new Color();
// 	private _color2 = new Color();
// 	update() {
// 		if (!this.node.pv.position) {
// 			return;
// 		}
// 		// this._inverse_position.copy(this.node.pv.position).multiplyScalar(-1)
// 		this._object.position.copy(this.node.pv.position).multiplyScalar(-1);
// 		this._quat.setFromUnitVectors(this._default_position, this.node.pv.position);
// 		this._object.setRotationFromQuaternion(this._quat);
// 		this._object.scale.setScalar(this.node.pv.helperSize);
// 		this._object.updateMatrix();

// 		const colors = this._geometry.getAttribute('color') as BufferAttribute;

// 		this._color1.copy(this.node.light.color);
// 		this._color2.copy(this.node.light.groundColor);

// 		for (let i = 0, l = colors.count; i < l; i++) {
// 			const color = i < l / 2 ? this._color1 : this._color2;

// 			colors.setXYZ(i, color.r, color.g, color.b);
// 		}

// 		colors.needsUpdate = true;
// 	}
// }