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