| 1 | /**
|
|---|
| 2 | * @author bhouston / http://exocortex.com
|
|---|
| 3 | * @author mrdoob / http://mrdoob.com/
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | THREE.Sphere = function ( center, radius ) {
|
|---|
| 7 |
|
|---|
| 8 | this.center = ( center !== undefined ) ? center : new THREE.Vector3();
|
|---|
| 9 | this.radius = ( radius !== undefined ) ? radius : 0;
|
|---|
| 10 |
|
|---|
| 11 | };
|
|---|
| 12 |
|
|---|
| 13 | THREE.Sphere.prototype = {
|
|---|
| 14 |
|
|---|
| 15 | constructor: THREE.Sphere,
|
|---|
| 16 |
|
|---|
| 17 | set: function ( center, radius ) {
|
|---|
| 18 |
|
|---|
| 19 | this.center.copy( center );
|
|---|
| 20 | this.radius = radius;
|
|---|
| 21 |
|
|---|
| 22 | return this;
|
|---|
| 23 | },
|
|---|
| 24 |
|
|---|
| 25 |
|
|---|
| 26 | setFromPoints: function () {
|
|---|
| 27 |
|
|---|
| 28 | var box = new THREE.Box3();
|
|---|
| 29 |
|
|---|
| 30 | return function ( points, optionalCenter ) {
|
|---|
| 31 |
|
|---|
| 32 | var center = this.center;
|
|---|
| 33 |
|
|---|
| 34 | if ( optionalCenter !== undefined ) {
|
|---|
| 35 |
|
|---|
| 36 | center.copy( optionalCenter );
|
|---|
| 37 |
|
|---|
| 38 | } else {
|
|---|
| 39 |
|
|---|
| 40 | box.setFromPoints( points ).center( center );
|
|---|
| 41 |
|
|---|
| 42 | }
|
|---|
| 43 |
|
|---|
| 44 | var maxRadiusSq = 0;
|
|---|
| 45 |
|
|---|
| 46 | for ( var i = 0, il = points.length; i < il; i ++ ) {
|
|---|
| 47 |
|
|---|
| 48 | maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( points[ i ] ) );
|
|---|
| 49 |
|
|---|
| 50 | }
|
|---|
| 51 |
|
|---|
| 52 | this.radius = Math.sqrt( maxRadiusSq );
|
|---|
| 53 |
|
|---|
| 54 | return this;
|
|---|
| 55 |
|
|---|
| 56 | };
|
|---|
| 57 |
|
|---|
| 58 | }(),
|
|---|
| 59 |
|
|---|
| 60 | copy: function ( sphere ) {
|
|---|
| 61 |
|
|---|
| 62 | this.center.copy( sphere.center );
|
|---|
| 63 | this.radius = sphere.radius;
|
|---|
| 64 |
|
|---|
| 65 | return this;
|
|---|
| 66 |
|
|---|
| 67 | },
|
|---|
| 68 |
|
|---|
| 69 | empty: function () {
|
|---|
| 70 |
|
|---|
| 71 | return ( this.radius <= 0 );
|
|---|
| 72 |
|
|---|
| 73 | },
|
|---|
| 74 |
|
|---|
| 75 | containsPoint: function ( point ) {
|
|---|
| 76 |
|
|---|
| 77 | return ( point.distanceToSquared( this.center ) <= ( this.radius * this.radius ) );
|
|---|
| 78 |
|
|---|
| 79 | },
|
|---|
| 80 |
|
|---|
| 81 | distanceToPoint: function ( point ) {
|
|---|
| 82 |
|
|---|
| 83 | return ( point.distanceTo( this.center ) - this.radius );
|
|---|
| 84 |
|
|---|
| 85 | },
|
|---|
| 86 |
|
|---|
| 87 | intersectsSphere: function ( sphere ) {
|
|---|
| 88 |
|
|---|
| 89 | var radiusSum = this.radius + sphere.radius;
|
|---|
| 90 |
|
|---|
| 91 | return sphere.center.distanceToSquared( this.center ) <= ( radiusSum * radiusSum );
|
|---|
| 92 |
|
|---|
| 93 | },
|
|---|
| 94 |
|
|---|
| 95 | clampPoint: function ( point, optionalTarget ) {
|
|---|
| 96 |
|
|---|
| 97 | var deltaLengthSq = this.center.distanceToSquared( point );
|
|---|
| 98 |
|
|---|
| 99 | var result = optionalTarget || new THREE.Vector3();
|
|---|
| 100 | result.copy( point );
|
|---|
| 101 |
|
|---|
| 102 | if ( deltaLengthSq > ( this.radius * this.radius ) ) {
|
|---|
| 103 |
|
|---|
| 104 | result.sub( this.center ).normalize();
|
|---|
| 105 | result.multiplyScalar( this.radius ).add( this.center );
|
|---|
| 106 |
|
|---|
| 107 | }
|
|---|
| 108 |
|
|---|
| 109 | return result;
|
|---|
| 110 |
|
|---|
| 111 | },
|
|---|
| 112 |
|
|---|
| 113 | getBoundingBox: function ( optionalTarget ) {
|
|---|
| 114 |
|
|---|
| 115 | var box = optionalTarget || new THREE.Box3();
|
|---|
| 116 |
|
|---|
| 117 | box.set( this.center, this.center );
|
|---|
| 118 | box.expandByScalar( this.radius );
|
|---|
| 119 |
|
|---|
| 120 | return box;
|
|---|
| 121 |
|
|---|
| 122 | },
|
|---|
| 123 |
|
|---|
| 124 | applyMatrix4: function ( matrix ) {
|
|---|
| 125 |
|
|---|
| 126 | this.center.applyMatrix4( matrix );
|
|---|
| 127 | this.radius = this.radius * matrix.getMaxScaleOnAxis();
|
|---|
| 128 |
|
|---|
| 129 | return this;
|
|---|
| 130 |
|
|---|
| 131 | },
|
|---|
| 132 |
|
|---|
| 133 | translate: function ( offset ) {
|
|---|
| 134 |
|
|---|
| 135 | this.center.add( offset );
|
|---|
| 136 |
|
|---|
| 137 | return this;
|
|---|
| 138 |
|
|---|
| 139 | },
|
|---|
| 140 |
|
|---|
| 141 | equals: function ( sphere ) {
|
|---|
| 142 |
|
|---|
| 143 | return sphere.center.equals( this.center ) && ( sphere.radius === this.radius );
|
|---|
| 144 |
|
|---|
| 145 | },
|
|---|
| 146 |
|
|---|
| 147 | clone: function () {
|
|---|
| 148 |
|
|---|
| 149 | return new THREE.Sphere().copy( this );
|
|---|
| 150 |
|
|---|
| 151 | }
|
|---|
| 152 |
|
|---|
| 153 | };
|
|---|
