import { Box3 } from './Box3.js';
import { Vector3 } from './Vector3.js';
const _box = /*@__PURE__*/ new Box3();
const _v1 = /*@__PURE__*/ new Vector3();
const _v2 = /*@__PURE__*/ new Vector3();
class Sphere {
constructor( center = new Vector3(), radius = - 1 ) {
this.isSphere = true;
this.center = center;
this.radius = radius;
}
set( center, radius ) {
this.center.copy( center );
this.radius = radius;
return this;
}
setFromPoints( points, optionalCenter ) {
const center = this.center;
if ( optionalCenter !== undefined ) {
center.copy( optionalCenter );
} else {
_box.setFromPoints( points ).getCenter( center );
}
let maxRadiusSq = 0;
for ( let i = 0, il = points.length; i < il; i ++ ) {
maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( points[ i ] ) );
}
this.radius = Math.sqrt( maxRadiusSq );
return this;
}
copy( sphere ) {
this.center.copy( sphere.center );
this.radius = sphere.radius;
return this;
}
isEmpty() {
return ( this.radius < 0 );
}
makeEmpty() {
this.center.set( 0, 0, 0 );
this.radius = - 1;
return this;
}
containsPoint( point ) {
return ( point.distanceToSquared( this.center ) <= ( this.radius * this.radius ) );
}
distanceToPoint( point ) {
return ( point.distanceTo( this.center ) - this.radius );
}
intersectsSphere( sphere ) {
const radiusSum = this.radius + sphere.radius;
return sphere.center.distanceToSquared( this.center ) <= ( radiusSum * radiusSum );
}
intersectsBox( box ) {
return box.intersectsSphere( this );
}
intersectsPlane( plane ) {
return Math.abs( plane.distanceToPoint( this.center ) ) <= this.radius;
}
clampPoint( point, target ) {
const deltaLengthSq = this.center.distanceToSquared( point );
target.copy( point );
if ( deltaLengthSq > ( this.radius * this.radius ) ) {
target.sub( this.center ).normalize();
target.multiplyScalar( this.radius ).add( this.center );
}
return target;
}
getBoundingBox( target ) {
if ( this.isEmpty() ) {
// Empty sphere produces empty bounding box
target.makeEmpty();
return target;
}
target.set( this.center, this.center );
target.expandByScalar( this.radius );
return target;
}
applyMatrix4( matrix ) {
this.center.applyMatrix4( matrix );
this.radius = this.radius * matrix.getMaxScaleOnAxis();
return this;
}
translate( offset ) {
this.center.add( offset );
return this;
}
expandByPoint( point ) {
if ( this.isEmpty() ) {
this.center.copy( point );
this.radius = 0;
return this;
}
_v1.subVectors( point, this.center );
const lengthSq = _v1.lengthSq();
if ( lengthSq > ( this.radius * this.radius ) ) {
// calculate the minimal sphere
const length = Math.sqrt( lengthSq );
const delta = ( length - this.radius ) * 0.5;
this.center.addScaledVector( _v1, delta / length );
this.radius += delta;
}
return this;
}
union( sphere ) {
if ( sphere.isEmpty() ) {
return this;
}
if ( this.isEmpty() ) {
this.copy( sphere );
return this;
}
if ( this.center.equals( sphere.center ) === true ) {
this.radius = Math.max( this.radius, sphere.radius );
} else {
_v2.subVectors( sphere.center, this.center ).setLength( sphere.radius );
this.expandByPoint( _v1.copy( sphere.center ).add( _v2 ) );
this.expandByPoint( _v1.copy( sphere.center ).sub( _v2 ) );
}
return this;
}
equals( sphere ) {
return sphere.center.equals( this.center ) && ( sphere.radius === this.radius );
}
clone() {
return new this.constructor().copy( this );
}
}
export { Sphere };
