mirror of
https://github.com/Doodle3D/Doodle3D-Slicer.git
synced 2024-09-17 17:30:06 +02:00
77 lines
1.7 KiB
JavaScript
77 lines
1.7 KiB
JavaScript
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/**
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* @author hughes
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* @author mrdoob / http://mrdoob.com/
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*/
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THREE.CircleTypedGeometry = function ( radius, segments, thetaStart, thetaLength ) {
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this.parameters = {
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radius: radius,
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segments: segments,
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thetaStart: thetaStart,
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thetaLength: thetaLength
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};
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radius = radius || 50;
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segments = segments !== undefined ? Math.max( 3, segments ) : 8;
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thetaStart = thetaStart !== undefined ? thetaStart : 0;
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thetaLength = thetaLength !== undefined ? thetaLength : Math.PI * 2;
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//
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var elements = segments + 2;
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var indices = new Uint16Array( segments * 3 );
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var vertices = new Float32Array( elements * 3 );
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var normals = new Float32Array( elements * 3 );
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var uvs = new Float32Array( elements * 2 );
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// center
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normals[ 2 ] = 1;
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uvs[ 0 ] = 0.5;
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uvs[ 1 ] = 0.5;
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var offset = 0, offset2 = 2, offset3 = 3;
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for ( var i = 0; i <= segments; i ++ ) {
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var segment = thetaStart + i / segments * thetaLength;
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var x = radius * Math.cos( segment );
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var y = radius * Math.sin( segment );
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vertices[ offset3 ] = x;
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vertices[ offset3 + 1 ] = y;
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normals[ offset3 + 2 ] = 1;
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uvs[ offset2 ] = ( x / radius + 1 ) / 2;
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uvs[ offset2 + 1 ] = ( y / radius + 1 ) / 2;
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offset2 += 2;
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offset3 += 3;
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//
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indices[ offset ] = 0;
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indices[ offset + 1 ] = i + 1;
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indices[ offset + 2 ] = i + 2;
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offset += 3;
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}
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THREE.IndexedTypedGeometry.call( this );
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this.setArrays( indices, vertices, normals, uvs );
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this.boundingSphere = new THREE.Sphere( new THREE.Vector3(), radius );
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};
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THREE.CircleTypedGeometry.prototype = Object.create( THREE.IndexedTypedGeometry.prototype );
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THREE.CircleTypedGeometry.prototype.constructor = THREE.CircleTypedGeometry;
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