1 /**
  2  * @author zz85 / https://github.com/zz85
  3  * Parametric Surfaces Geometry
  4  * based on the brilliant article by @prideout http://prideout.net/blog/?p=44
  5  *
  6  * new THREE.ParametricGeometry( parametricFunction, uSegments, ySegements, useTris );
  7  *
  8  */
  9 
 10 /**@constructor*/
 11 THREE.ParametricGeometry = function ( func, slices, stacks, useTris ) {
 12 
 13 	THREE.Geometry.call( this );
 14 
 15 	var verts = this.vertices;
 16 	var faces = this.faces;
 17 	var uvs = this.faceVertexUvs[ 0 ];
 18 
 19 	useTris = (useTris === undefined) ? false : useTris;
 20 
 21 	var i, il, j, p;
 22 	var u, v;
 23 
 24 	var stackCount = stacks + 1;
 25 	var sliceCount = slices + 1;
 26 
 27 	for ( i = 0; i <= stacks; i ++ ) {
 28 
 29 		v = i / stacks;
 30 
 31 		for ( j = 0; j <= slices; j ++ ) {
 32 
 33 			u = j / slices;
 34 
 35 			p = func( u, v );
 36 			verts.push( p );
 37 
 38 		}
 39 	}
 40 
 41 	var a, b, c, d;
 42 	var uva, uvb, uvc, uvd;
 43 
 44 	for ( i = 0; i < stacks; i ++ ) {
 45 
 46 		for ( j = 0; j < slices; j ++ ) {
 47 
 48 			a = i * sliceCount + j;
 49 			b = i * sliceCount + j + 1;
 50 			c = (i + 1) * sliceCount + j;
 51 			d = (i + 1) * sliceCount + j + 1;
 52 
 53 			uva = new THREE.UV( j / slices, i / stacks );
 54 			uvb = new THREE.UV( ( j + 1 ) / slices, i / stacks );
 55 			uvc = new THREE.UV( j / slices, ( i + 1 ) / stacks );
 56 			uvd = new THREE.UV( ( j + 1 ) / slices, ( i + 1 ) / stacks );
 57 
 58 			if ( useTris ) {
 59 
 60 				faces.push( new THREE.Face3( a, b, c ) );
 61 				faces.push( new THREE.Face3( b, d, c ) );
 62 
 63 				uvs.push( [ uva, uvb, uvc ] );
 64 				uvs.push( [ uvb, uvd, uvc ] );
 65 
 66 			} else {
 67 
 68 				faces.push( new THREE.Face4( a, b, d, c ) );
 69 				uvs.push( [ uva, uvb, uvd, uvc ] );
 70 
 71 			}
 72 
 73 		}
 74 
 75 	}
 76 
 77 	// console.log(this);
 78 
 79 	// magic bullet
 80 	// var diff = this.mergeVertices();
 81 	// console.log('removed ', diff, ' vertices by merging');
 82 
 83 	this.computeCentroids();
 84 	this.computeFaceNormals();
 85 	this.computeVertexNormals();
 86 
 87 };
 88 
 89 THREE.ParametricGeometry.prototype = Object.create( THREE.Geometry.prototype );
 90 

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