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import {
InstancedInterleavedBuffer,
InterleavedBufferAttribute,
Mesh,
Vector3,
Vector4
} from 'three';
import { LineSegmentsGeometry } from '../lines/LineSegmentsGeometry.js';
import { LineMaterial } from '../lines/LineMaterial.js';
const _start = new Vector3();
const _end = new Vector3();
const _viewport = new Vector4();
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;
}
onBeforeRender( renderer ) {
const uniforms = this.material.uniforms;
if ( uniforms && uniforms.resolution ) {
renderer.getViewport( _viewport );
this.material.uniforms.resolution.value.set( _viewport.z, _viewport.w );
}
}
}
export { Wireframe };
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