three
Version:
JavaScript 3D library
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JavaScript
console.warn( "THREE.SelectionBox: As part of the transition to ES6 Modules, the files in 'examples/js' were deprecated in May 2020 (r117) and will be deleted in December 2020 (r124). You can find more information about developing using ES6 Modules in https://threejs.org/docs/#manual/en/introduction/Installation." );
/**
* This is a class to check whether objects are in a selection area in 3D space
*/
THREE.SelectionBox = ( function () {
var frustum = new THREE.Frustum();
var center = new THREE.Vector3();
var tmpPoint = new THREE.Vector3();
var vecNear = new THREE.Vector3();
var vecTopLeft = new THREE.Vector3();
var vecTopRight = new THREE.Vector3();
var vecDownRight = new THREE.Vector3();
var vecDownLeft = new THREE.Vector3();
var vecFarTopLeft = new THREE.Vector3();
var vecFarTopRight = new THREE.Vector3();
var vecFarDownRight = new THREE.Vector3();
var vecFarDownLeft = new THREE.Vector3();
var vectemp1 = new THREE.Vector3();
var vectemp2 = new THREE.Vector3();
var vectemp3 = new THREE.Vector3();
function SelectionBox( camera, scene, deep ) {
this.camera = camera;
this.scene = scene;
this.startPoint = new THREE.Vector3();
this.endPoint = new THREE.Vector3();
this.collection = [];
this.deep = deep || Number.MAX_VALUE;
}
SelectionBox.prototype.select = function ( startPoint, endPoint ) {
this.startPoint = startPoint || this.startPoint;
this.endPoint = endPoint || this.endPoint;
this.collection = [];
this.updateFrustum( this.startPoint, this.endPoint );
this.searchChildInFrustum( frustum, this.scene );
return this.collection;
};
SelectionBox.prototype.updateFrustum = function ( startPoint, endPoint ) {
startPoint = startPoint || this.startPoint;
endPoint = endPoint || this.endPoint;
// Avoid invalid frustum
if ( startPoint.x === endPoint.x ) {
endPoint.x += Number.EPSILON;
}
if ( startPoint.y === endPoint.y ) {
endPoint.y += Number.EPSILON;
}
this.camera.updateProjectionMatrix();
this.camera.updateMatrixWorld();
if ( this.camera.isPerspectiveCamera ) {
tmpPoint.copy( startPoint );
tmpPoint.x = Math.min( startPoint.x, endPoint.x );
tmpPoint.y = Math.max( startPoint.y, endPoint.y );
endPoint.x = Math.max( startPoint.x, endPoint.x );
endPoint.y = Math.min( startPoint.y, endPoint.y );
vecNear.setFromMatrixPosition( this.camera.matrixWorld );
vecTopLeft.copy( tmpPoint );
vecTopRight.set( endPoint.x, tmpPoint.y, 0 );
vecDownRight.copy( endPoint );
vecDownLeft.set( tmpPoint.x, endPoint.y, 0 );
vecTopLeft.unproject( this.camera );
vecTopRight.unproject( this.camera );
vecDownRight.unproject( this.camera );
vecDownLeft.unproject( this.camera );
vectemp1.copy( vecTopLeft ).sub( vecNear );
vectemp2.copy( vecTopRight ).sub( vecNear );
vectemp3.copy( vecDownRight ).sub( vecNear );
vectemp1.normalize();
vectemp2.normalize();
vectemp3.normalize();
vectemp1.multiplyScalar( this.deep );
vectemp2.multiplyScalar( this.deep );
vectemp3.multiplyScalar( this.deep );
vectemp1.add( vecNear );
vectemp2.add( vecNear );
vectemp3.add( vecNear );
var planes = frustum.planes;
planes[ 0 ].setFromCoplanarPoints( vecNear, vecTopLeft, vecTopRight );
planes[ 1 ].setFromCoplanarPoints( vecNear, vecTopRight, vecDownRight );
planes[ 2 ].setFromCoplanarPoints( vecDownRight, vecDownLeft, vecNear );
planes[ 3 ].setFromCoplanarPoints( vecDownLeft, vecTopLeft, vecNear );
planes[ 4 ].setFromCoplanarPoints( vecTopRight, vecDownRight, vecDownLeft );
planes[ 5 ].setFromCoplanarPoints( vectemp3, vectemp2, vectemp1 );
planes[ 5 ].normal.multiplyScalar( - 1 );
} else if ( this.camera.isOrthographicCamera ) {
var left = Math.min( startPoint.x, endPoint.x );
var top = Math.max( startPoint.y, endPoint.y );
var right = Math.max( startPoint.x, endPoint.x );
var down = Math.min( startPoint.y, endPoint.y );
vecTopLeft.set( left, top, - 1 );
vecTopRight.set( right, top, - 1 );
vecDownRight.set( right, down, - 1 );
vecDownLeft.set( left, down, - 1 );
vecFarTopLeft.set( left, top, 1 );
vecFarTopRight.set( right, top, 1 );
vecFarDownRight.set( right, down, 1 );
vecFarDownLeft.set( left, down, 1 );
vecTopLeft.unproject( this.camera );
vecTopRight.unproject( this.camera );
vecDownRight.unproject( this.camera );
vecDownLeft.unproject( this.camera );
vecFarTopLeft.unproject( this.camera );
vecFarTopRight.unproject( this.camera );
vecFarDownRight.unproject( this.camera );
vecFarDownLeft.unproject( this.camera );
var planes = frustum.planes;
planes[ 0 ].setFromCoplanarPoints( vecTopLeft, vecFarTopLeft, vecFarTopRight );
planes[ 1 ].setFromCoplanarPoints( vecTopRight, vecFarTopRight, vecFarDownRight );
planes[ 2 ].setFromCoplanarPoints( vecFarDownRight, vecFarDownLeft, vecDownLeft );
planes[ 3 ].setFromCoplanarPoints( vecFarDownLeft, vecFarTopLeft, vecTopLeft );
planes[ 4 ].setFromCoplanarPoints( vecTopRight, vecDownRight, vecDownLeft );
planes[ 5 ].setFromCoplanarPoints( vecFarDownRight, vecFarTopRight, vecFarTopLeft );
planes[ 5 ].normal.multiplyScalar( - 1 );
} else {
console.error( 'THREE.SelectionBox: Unsupported camera type.' );
}
};
SelectionBox.prototype.searchChildInFrustum = function ( frustum, object ) {
if ( object.isMesh || object.isLine || object.isPoints ) {
if ( object.material !== undefined ) {
if ( object.geometry.boundingSphere === null ) object.geometry.computeBoundingSphere();
center.copy( object.geometry.boundingSphere.center );
center.applyMatrix4( object.matrixWorld );
if ( frustum.containsPoint( center ) ) {
this.collection.push( object );
}
}
}
if ( object.children.length > 0 ) {
for ( var x = 0; x < object.children.length; x ++ ) {
this.searchChildInFrustum( frustum, object.children[ x ] );
}
}
};
return SelectionBox;
} )();