最新代码

public/sdk/three/jsm/lines/Wireframe.js

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+import {
+	InstancedInterleavedBuffer,
+	InterleavedBufferAttribute,
+	Mesh,
+	Vector3
+} from 'three';
+import { LineSegmentsGeometry } from '../lines/LineSegmentsGeometry.js';
+import { LineMaterial } from '../lines/LineMaterial.js';
+
+const _start = new Vector3();
+const _end = new Vector3();
+
+class Wireframe extends Mesh {
+
+	constructor( geometry = new LineSegmentsGeometry(), material = new LineMaterial( { color: Math.random() * 0xffffff } ) ) {
+
+		super( geometry, material );
+
+		this.isWireframe = true;
+
+		this.type = 'Wireframe';
+
+	}
+
+	// for backwards-compatibility, but could be a method of LineSegmentsGeometry...
+
+	computeLineDistances() {
+
+		const geometry = this.geometry;
+
+		const instanceStart = geometry.attributes.instanceStart;
+		const instanceEnd = geometry.attributes.instanceEnd;
+		const lineDistances = new Float32Array( 2 * instanceStart.count );
+
+		for ( let i = 0, j = 0, l = instanceStart.count; i < l; i ++, j += 2 ) {
+
+			_start.fromBufferAttribute( instanceStart, i );
+			_end.fromBufferAttribute( instanceEnd, i );
+
+			lineDistances[ j ] = ( j === 0 ) ? 0 : lineDistances[ j - 1 ];
+			lineDistances[ j + 1 ] = lineDistances[ j ] + _start.distanceTo( _end );
+
+		}
+
+		const instanceDistanceBuffer = new InstancedInterleavedBuffer( lineDistances, 2, 1 ); // d0, d1
+
+		geometry.setAttribute( 'instanceDistanceStart', new InterleavedBufferAttribute( instanceDistanceBuffer, 1, 0 ) ); // d0
+		geometry.setAttribute( 'instanceDistanceEnd', new InterleavedBufferAttribute( instanceDistanceBuffer, 1, 1 ) ); // d1
+
+		return this;
+
+	}
+
+}
+
+export { Wireframe };