Я использую Three.js и мне интересно, как получить все объекты в данной области?

Например, получить все объекты, найденные в зеленом квадрате:

Решение:

        getEntitiesInSelection: function(x, z, width, height, inGroup) {
            var self = this,
                entitiesMap = [],
                color = 0,
                colors = [],
                ids = [],
                pickingGeometry = new THREE.Geometry(),
                pickingMaterial = new THREE.MeshBasicMaterial( { vertexColors: THREE.VertexColors } ),
                pickingScene = new THREE.Scene(),
                pickingTexture = new THREE.WebGLRenderTarget( this._renderer.domElement.width, this._renderer.domElement.height),
                cloneMesh,
                entities = inGroup ?
                    engine.getObjectsByGroup(inGroup) : engine.getRegisteredEntities();

            pickingTexture.generateMipmaps = false;

            //Go over each entity, change its color into its ID
            _.forEach(entities, function(entity) {
                if(undefined == entity.threeRenderable) {
                    return ;
                }

                //Clone entity
                cloneMesh = entity.threeRenderable.mesh().clone();
                cloneMesh.material = entity.threeRenderable.mesh().material.clone();
                cloneMesh.material.map = null;
                cloneMesh.material.vertexColors = THREE.VertexColors;
                cloneMesh.geometry = entity.threeRenderable.mesh().geometry.clone();
                cloneMesh.position.copy( entity.threeRenderable.mesh().position );
                cloneMesh.rotation.copy( entity.threeRenderable.mesh().rotation );
                cloneMesh.scale.copy( entity.threeRenderable.mesh().scale );

                //Cancel shadow
                cloneMesh.castShadow = false;
                cloneMesh.receiveShadow  = false;

                //Set color as entity ID
                entitiesMap[color] = entity.id();
                self._applyVertexColors(cloneMesh.geometry, new THREE.Color( color ) );
                color++;

                THREE.GeometryUtils.merge( pickingGeometry,  cloneMesh);
            });

            pickingScene.add( new THREE.Mesh( pickingGeometry, pickingMaterial ) );

            //render the picking scene off-screen
            this._renderer.render(pickingScene, this._objs[this._mainCamera], pickingTexture );
            var gl = this._renderer.getContext();

            //read the pixel under the mouse from the texture
            var pixelBuffer = new Uint8Array( 4 * width * height );
            gl.readPixels( x, this._renderer.domElement.height - z, width, height, gl.RGBA, gl.UNSIGNED_BYTE, pixelBuffer );

            //Convert RGB in the selected area back to color
            for(var i=0; i