最新代码

public/sdk/three/jsm/helpers/RectAreaLightHelper.js

@@ -0,0 +1,85 @@
+import {
+	BackSide,
+	BufferGeometry,
+	Float32BufferAttribute,
+	Line,
+	LineBasicMaterial,
+	Mesh,
+	MeshBasicMaterial
+} from 'three';
+
+/**
+ *  This helper must be added as a child of the light
+ */
+
+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; // optional hardwired color for the helper
+		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 !== undefined ) {
+
+			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 );
+
+			// prevent hue shift
+			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 );
+
+		}
+
+		// ignore world scale on light
+		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 };