152 lines
2.5 KiB
JavaScript
152 lines
2.5 KiB
JavaScript
/**
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* @author bhouston / http://exocortex.com
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* @author mrdoob / http://mrdoob.com/
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*/
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THREE.Sphere = function ( center, radius ) {
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this.center = ( center !== undefined ) ? center : new THREE.Vector3();
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this.radius = ( radius !== undefined ) ? radius : 0;
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};
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THREE.Sphere.prototype = {
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constructor: THREE.Sphere,
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set: function ( center, radius ) {
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this.center.copy( center );
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this.radius = radius;
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return this;
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},
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setFromPoints: function () {
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var box = new THREE.Box3();
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return function ( points, optionalCenter ) {
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var center = this.center;
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if ( optionalCenter !== undefined ) {
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center.copy( optionalCenter );
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} else {
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box.setFromPoints( points ).center( center );
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}
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var maxRadiusSq = 0;
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for ( var i = 0, il = points.length; i < il; i ++ ) {
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maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( points[ i ] ) );
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}
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this.radius = Math.sqrt( maxRadiusSq );
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return this;
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};
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}(),
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copy: function ( sphere ) {
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this.center.copy( sphere.center );
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this.radius = sphere.radius;
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return this;
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},
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empty: function () {
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return ( this.radius <= 0 );
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},
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containsPoint: function ( point ) {
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return ( point.distanceToSquared( this.center ) <= ( this.radius * this.radius ) );
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},
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distanceToPoint: function ( point ) {
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return ( point.distanceTo( this.center ) - this.radius );
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},
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intersectsSphere: function ( sphere ) {
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var radiusSum = this.radius + sphere.radius;
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return sphere.center.distanceToSquared( this.center ) <= ( radiusSum * radiusSum );
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},
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clampPoint: function ( point, optionalTarget ) {
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var deltaLengthSq = this.center.distanceToSquared( point );
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var result = optionalTarget || new THREE.Vector3();
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result.copy( point );
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if ( deltaLengthSq > ( this.radius * this.radius ) ) {
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result.sub( this.center ).normalize();
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result.multiplyScalar( this.radius ).add( this.center );
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}
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return result;
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},
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getBoundingBox: function ( optionalTarget ) {
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var box = optionalTarget || new THREE.Box3();
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box.set( this.center, this.center );
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box.expandByScalar( this.radius );
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return box;
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},
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applyMatrix4: function ( matrix ) {
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this.center.applyMatrix4( matrix );
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this.radius = this.radius * matrix.getMaxScaleOnAxis();
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return this;
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},
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translate: function ( offset ) {
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this.center.add( offset );
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return this;
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},
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equals: function ( sphere ) {
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return sphere.center.equals( this.center ) && ( sphere.radius === this.radius );
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},
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clone: function () {
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return new THREE.Sphere().copy( this );
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}
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};
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