File size: 4,116 Bytes
b797337 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 | import { BufferGeometry } from '../core/BufferGeometry.js';
import { Float32BufferAttribute } from '../core/BufferAttribute.js';
import * as MathUtils from '../math/MathUtils.js';
import { Triangle } from '../math/Triangle.js';
import { Vector3 } from '../math/Vector3.js';
const _v0 = /*@__PURE__*/ new Vector3();
const _v1 = /*@__PURE__*/ new Vector3();
const _normal = /*@__PURE__*/ new Vector3();
const _triangle = /*@__PURE__*/ new Triangle();
class EdgesGeometry extends BufferGeometry {
constructor( geometry = null, thresholdAngle = 1 ) {
super();
this.type = 'EdgesGeometry';
this.parameters = {
geometry: geometry,
thresholdAngle: thresholdAngle
};
if ( geometry !== null ) {
const precisionPoints = 4;
const precision = Math.pow( 10, precisionPoints );
const thresholdDot = Math.cos( MathUtils.DEG2RAD * thresholdAngle );
const indexAttr = geometry.getIndex();
const positionAttr = geometry.getAttribute( 'position' );
const indexCount = indexAttr ? indexAttr.count : positionAttr.count;
const indexArr = [ 0, 0, 0 ];
const vertKeys = [ 'a', 'b', 'c' ];
const hashes = new Array( 3 );
const edgeData = {};
const vertices = [];
for ( let i = 0; i < indexCount; i += 3 ) {
if ( indexAttr ) {
indexArr[ 0 ] = indexAttr.getX( i );
indexArr[ 1 ] = indexAttr.getX( i + 1 );
indexArr[ 2 ] = indexAttr.getX( i + 2 );
} else {
indexArr[ 0 ] = i;
indexArr[ 1 ] = i + 1;
indexArr[ 2 ] = i + 2;
}
const { a, b, c } = _triangle;
a.fromBufferAttribute( positionAttr, indexArr[ 0 ] );
b.fromBufferAttribute( positionAttr, indexArr[ 1 ] );
c.fromBufferAttribute( positionAttr, indexArr[ 2 ] );
_triangle.getNormal( _normal );
// create hashes for the edge from the vertices
hashes[ 0 ] = `${ Math.round( a.x * precision ) },${ Math.round( a.y * precision ) },${ Math.round( a.z * precision ) }`;
hashes[ 1 ] = `${ Math.round( b.x * precision ) },${ Math.round( b.y * precision ) },${ Math.round( b.z * precision ) }`;
hashes[ 2 ] = `${ Math.round( c.x * precision ) },${ Math.round( c.y * precision ) },${ Math.round( c.z * precision ) }`;
// skip degenerate triangles
if ( hashes[ 0 ] === hashes[ 1 ] || hashes[ 1 ] === hashes[ 2 ] || hashes[ 2 ] === hashes[ 0 ] ) {
continue;
}
// iterate over every edge
for ( let j = 0; j < 3; j ++ ) {
// get the first and next vertex making up the edge
const jNext = ( j + 1 ) % 3;
const vecHash0 = hashes[ j ];
const vecHash1 = hashes[ jNext ];
const v0 = _triangle[ vertKeys[ j ] ];
const v1 = _triangle[ vertKeys[ jNext ] ];
const hash = `${ vecHash0 }_${ vecHash1 }`;
const reverseHash = `${ vecHash1 }_${ vecHash0 }`;
if ( reverseHash in edgeData && edgeData[ reverseHash ] ) {
// if we found a sibling edge add it into the vertex array if
// it meets the angle threshold and delete the edge from the map.
if ( _normal.dot( edgeData[ reverseHash ].normal ) <= thresholdDot ) {
vertices.push( v0.x, v0.y, v0.z );
vertices.push( v1.x, v1.y, v1.z );
}
edgeData[ reverseHash ] = null;
} else if ( ! ( hash in edgeData ) ) {
// if we've already got an edge here then skip adding a new one
edgeData[ hash ] = {
index0: indexArr[ j ],
index1: indexArr[ jNext ],
normal: _normal.clone(),
};
}
}
}
// iterate over all remaining, unmatched edges and add them to the vertex array
for ( const key in edgeData ) {
if ( edgeData[ key ] ) {
const { index0, index1 } = edgeData[ key ];
_v0.fromBufferAttribute( positionAttr, index0 );
_v1.fromBufferAttribute( positionAttr, index1 );
vertices.push( _v0.x, _v0.y, _v0.z );
vertices.push( _v1.x, _v1.y, _v1.z );
}
}
this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
}
}
copy( source ) {
super.copy( source );
this.parameters = Object.assign( {}, source.parameters );
return this;
}
}
export { EdgesGeometry };
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