83 lines
2.4 KiB
JavaScript
83 lines
2.4 KiB
JavaScript
/**
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* @author Kaleb Murphy
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*/
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THREE.RingGeometry = function ( innerRadius, outerRadius, thetaSegments, phiSegments, thetaStart, thetaLength ) {
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THREE.Geometry.call( this );
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this.type = 'RingGeometry';
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this.parameters = {
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innerRadius: innerRadius,
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outerRadius: outerRadius,
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thetaSegments: thetaSegments,
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phiSegments: phiSegments,
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thetaStart: thetaStart,
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thetaLength: thetaLength
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};
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innerRadius = innerRadius || 0;
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outerRadius = outerRadius || 50;
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thetaStart = thetaStart !== undefined ? thetaStart : 0;
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thetaLength = thetaLength !== undefined ? thetaLength : Math.PI * 2;
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thetaSegments = thetaSegments !== undefined ? Math.max( 3, thetaSegments ) : 8;
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phiSegments = phiSegments !== undefined ? Math.max( 1, phiSegments ) : 8;
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var i, o, uvs = [], radius = innerRadius, radiusStep = ( ( outerRadius - innerRadius ) / phiSegments );
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for ( i = 0; i < phiSegments + 1; i ++ ) { // concentric circles inside ring
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for ( o = 0; o < thetaSegments + 1; o ++ ) { // number of segments per circle
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var vertex = new THREE.Vector3();
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var segment = thetaStart + o / thetaSegments * thetaLength;
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vertex.x = radius * Math.cos( segment );
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vertex.y = radius * Math.sin( segment );
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this.vertices.push( vertex );
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uvs.push( new THREE.Vector2( ( vertex.x / outerRadius + 1 ) / 2, ( vertex.y / outerRadius + 1 ) / 2 ) );
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}
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radius += radiusStep;
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}
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var n = new THREE.Vector3( 0, 0, 1 );
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for ( i = 0; i < phiSegments; i ++ ) { // concentric circles inside ring
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var thetaSegment = i * (thetaSegments + 1);
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for ( o = 0; o < thetaSegments ; o ++ ) { // number of segments per circle
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var segment = o + thetaSegment;
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var v1 = segment;
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var v2 = segment + thetaSegments + 1;
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var v3 = segment + thetaSegments + 2;
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this.faces.push( new THREE.Face3( v1, v2, v3, [ n.clone(), n.clone(), n.clone() ] ) );
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this.faceVertexUvs[ 0 ].push( [ uvs[ v1 ].clone(), uvs[ v2 ].clone(), uvs[ v3 ].clone() ]);
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v1 = segment;
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v2 = segment + thetaSegments + 2;
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v3 = segment + 1;
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this.faces.push( new THREE.Face3( v1, v2, v3, [ n.clone(), n.clone(), n.clone() ] ) );
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this.faceVertexUvs[ 0 ].push( [ uvs[ v1 ].clone(), uvs[ v2 ].clone(), uvs[ v3 ].clone() ]);
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}
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}
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this.computeFaceNormals();
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this.boundingSphere = new THREE.Sphere( new THREE.Vector3(), radius );
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};
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THREE.RingGeometry.prototype = Object.create( THREE.Geometry.prototype );
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THREE.RingGeometry.prototype.constructor = THREE.RingGeometry;
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