three 基础库
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( function () {
const _start = new THREE.Vector3();
const _end = new THREE.Vector3();
class Wireframe extends THREE.Mesh {
constructor( geometry = new THREE.LineSegmentsGeometry(), material = new THREE.LineMaterial( {
color: Math.random() * 0xffffff
} ) ) {
super( geometry, material );
this.type = 'Wireframe';
} // for backwards-compatability, but could be a method of THREE.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 THREE.InstancedInterleavedBuffer( lineDistances, 2, 1 ); // d0, d1
geometry.setAttribute( 'instanceDistanceStart', new THREE.InterleavedBufferAttribute( instanceDistanceBuffer, 1, 0 ) ); // d0
geometry.setAttribute( 'instanceDistanceEnd', new THREE.InterleavedBufferAttribute( instanceDistanceBuffer, 1, 1 ) ); // d1
return this;
}
}
Wireframe.prototype.isWireframe = true;
THREE.Wireframe = Wireframe;
} )();