add boxselection demo

examples/files.js

@@ -59,6 +59,7 @@ var files = {
 		"webgl_interactive_lines",
 		"webgl_interactive_points",
 		"webgl_interactive_raycasting_points",
+		"webgl_interactive_boxselection",
 		"webgl_interactive_voxelpainter",
 		"webgl_kinect",
 		"webgl_lensflares",

examples/js/interactive/SelectionBox.js

+/**
+ * @author HypnosNova / https://www.threejs.org.cn/gallery
+ * This is a class to check whether objects are in a selection area in 3D space
+ */
+
+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 = [];
+    
+	var boxSelectionFrustum = this.createFrustum( this.startPoint, this.endPoint );
+	this.searchChildInFrustum( boxSelectionFrustum, this.scene );
+    
+	return this.collection;
+	
+}
+
+SelectionBox.prototype.createFrustum = function ( startPoint, endPoint ) {
+	
+	startPoint = startPoint || this.startPoint;
+	endPoint = endPoint || this.endPoint
+
+	this.camera.updateProjectionMatrix();
+	this.camera.updateMatrixWorld();
+	this.camera.updateMatrix();
+
+	var tmpPoint = startPoint.clone();
+	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 );
+
+	var vecNear = this.camera.position.clone();
+	var vecTopLeft = tmpPoint.clone();
+	var vecTopRight = new THREE.Vector3( endPoint.x, tmpPoint.y, 0 );
+	var vecDownRight = endPoint.clone();
+	var vecDownLeft = new THREE.Vector3( tmpPoint.x, endPoint.y, 0 );
+	vecTopLeft.unproject( this.camera );
+	vecTopRight.unproject( this.camera );
+	vecDownRight.unproject( this.camera );
+	vecDownLeft.unproject( this.camera );
+
+	var vectemp1 = vecTopLeft.clone().sub( vecNear );
+	var vectemp2 = vecTopRight.clone().sub( vecNear );
+	var vectemp3 = vecDownRight.clone().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 planeTop = new THREE.Plane();
+	planeTop.setFromCoplanarPoints( vecNear, vecTopLeft, vecTopRight );
+	var planeRight = new THREE.Plane();
+	planeRight.setFromCoplanarPoints( vecNear, vecTopRight, vecDownRight );
+	var planeDown = new THREE.Plane();
+	planeDown.setFromCoplanarPoints( vecDownRight, vecDownLeft, vecNear );
+	var planeLeft = new THREE.Plane();
+	planeLeft.setFromCoplanarPoints( vecDownLeft, vecTopLeft, vecNear );
+	var planeFront = new THREE.Plane();
+	planeFront.setFromCoplanarPoints( vecTopRight, vecDownRight, vecDownLeft );
+	var planeBack = new THREE.Plane();
+	planeBack.setFromCoplanarPoints( vectemp3, vectemp2, vectemp1 );
+	planeBack.normal = planeBack.normal.multiplyScalar( -1 );
+
+	return new THREE.Frustum( planeTop, planeRight, planeDown, planeLeft, planeFront, planeBack );
+
+}
+
+SelectionBox.prototype.searchChildInFrustum = function ( frustum, object ) {
+
+	if ( object instanceof THREE.Mesh ) {
+
+		if ( object.material !== undefined ) {
+
+			object.geometry.computeBoundingSphere();
+			var center = object.geometry.boundingSphere.center.clone().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] );
+
+		}
+
+	}
+    
+}
\ No newline at end of file

examples/js/interactive/SelectionHelper.js

+function SelectionHelper ( selectionBox, renderer, cssClassName ) {
+
+	this.element = document.createElement( "div" );
+	this.element.classList.add( cssClassName );
+	this.element.style.pointerEvents = "none";
+
+	this.renderer = renderer;
+
+	this.startPoint = { x: 0, y: 0 };
+	this.pointTopLeft = { x: 0, y: 0 };
+	this.pointBottomRight = { x: 0, y: 0 };
+
+	this.isDown = false;
+
+	this.renderer.domElement.addEventListener( "mousedown", function ( event ) {
+		
+		this.isDown = true;
+		this.onSelectStart( event );
+
+	}.bind( this ), false );
+
+	this.renderer.domElement.addEventListener( "mousemove", function ( event ) {
+
+		if ( this.isDown ) {
+
+			this.onSelectMove( event );
+
+		}
+
+	}.bind( this ), false );
+
+	this.renderer.domElement.addEventListener( "mouseup", function ( event ) {
+
+		this.isDown = false;
+		this.onSelectOver( event );
+
+	}.bind( this ), false );
+	
+}
+
+SelectionHelper.prototype.onSelectStart = function ( event ) {
+	
+	this.renderer.domElement.parentElement.appendChild( this.element );
+
+	this.element.style.left = event.clientX + "px";
+	this.element.style.top = event.clientY + "px";
+	this.element.style.width = "0px";
+	this.element.style.height = "0px";
+
+	this.startPoint.x = event.clientX;
+	this.startPoint.y = event.clientY;
+
+}
+
+SelectionHelper.prototype.onSelectMove = function ( event ) {
+
+	this.pointBottomRight.x = Math.max( this.startPoint.x, event.clientX );
+	this.pointBottomRight.y = Math.max( this.startPoint.y, event.clientY );
+	this.pointTopLeft.x = Math.min( this.startPoint.x, event.clientX );
+	this.pointTopLeft.y = Math.min( this.startPoint.y, event.clientY );
+
+	this.element.style.left = this.pointTopLeft.x + "px";
+	this.element.style.top = this.pointTopLeft.y + "px";
+	this.element.style.width = ( this.pointBottomRight.x - this.pointTopLeft.x ) + "px";
+	this.element.style.height = ( this.pointBottomRight.y - this.pointTopLeft.y ) + "px";
+	
+}
+
+SelectionHelper.prototype.onSelectOver = function ( event ) {
+
+	this.element.parentElement.removeChild( this.element );
+	
+}

examples/webgl_interactive_boxselection.html

+<!DOCTYPE html>
+<html lang="en">
+	<head>
+		<title>three.js webgl - draggable cubes</title>
+		<meta charset="utf-8">
+		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
+		<style>
+			body {
+				font-family: Monospace;
+				background-color: #f0f0f0;
+				margin: 0px;
+				overflow: hidden;
+			}
+			
+			.selectBox {
+				border: 1px solid #55aaff;
+				background-color: rgba(75, 160, 255, 0.3);
+				position: fixed;
+			}
+		</style>
+	</head>
+	<body>
+
+		<script src="../build/three.js"></script>
+		<script src="js/libs/stats.min.js"></script>
+		
+		<script src="js/interactive/SelectionBox.js"></script>
+		<script src="js/interactive/SelectionHelper.js"></script>
+
+		<script>
+
+			var container, stats;
+			var camera, controls, scene, renderer;
+			var objects = [];
+
+			init();
+			animate();
+
+			function init() {
+
+				container = document.createElement( 'div' );
+				document.body.appendChild( container );
+
+				camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 5000 );
+				camera.position.z = 1000;
+
+				scene = new THREE.Scene();
+				scene.background = new THREE.Color( 0xf0f0f0 );
+
+				scene.add( new THREE.AmbientLight( 0x505050 ) );
+
+				var light = new THREE.SpotLight( 0xffffff, 1.5 );
+				light.position.set( 0, 500, 2000 );
+				light.angle = Math.PI / 9;
+
+				light.castShadow = true;
+				light.shadow.camera.near = 1000;
+				light.shadow.camera.far = 4000;
+				light.shadow.mapSize.width = 1024;
+				light.shadow.mapSize.height = 1024;
+
+				scene.add( light );
+
+				var geometry = new THREE.BoxBufferGeometry( 20, 20, 20 );
+
+				for ( var i = 0; i < 200; i ++ ) {
+
+					var object = new THREE.Mesh( geometry, new THREE.MeshLambertMaterial( { color: Math.random() * 0xffffff } ) );
+
+					object.position.x = Math.random() * 1600 - 800;
+					object.position.y = Math.random() * 900 - 450;
+					object.position.z = Math.random() * 900 - 500;
+
+					object.rotation.x = Math.random() * 2 * Math.PI;
+					object.rotation.y = Math.random() * 2 * Math.PI;
+					object.rotation.z = Math.random() * 2 * Math.PI;
+
+					object.scale.x = Math.random() * 2 + 1;
+					object.scale.y = Math.random() * 2 + 1;
+					object.scale.z = Math.random() * 2 + 1;
+
+					object.castShadow = true;
+					object.receiveShadow = true;
+
+					scene.add( object );
+
+					objects.push( object );
+
+				}
+
+				renderer = new THREE.WebGLRenderer( { antialias: true } );
+				renderer.setPixelRatio( window.devicePixelRatio );
+				renderer.setSize( window.innerWidth, window.innerHeight );
+
+				renderer.shadowMap.enabled = true;
+				renderer.shadowMap.type = THREE.PCFShadowMap;
+
+				container.appendChild( renderer.domElement );
+
+				var info = document.createElement( 'div' );
+				info.style.position = 'absolute';
+				info.style.top = '10px';
+				info.style.width = '100%';
+				info.style.textAlign = 'center';
+				info.innerHTML = '<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - box selection';
+				container.appendChild( info );
+
+				stats = new Stats();
+				container.appendChild( stats.dom );
+
+				//
+
+				window.addEventListener( 'resize', onWindowResize, false );
+
+			}
+
+			function onWindowResize() {
+
+				camera.aspect = window.innerWidth / window.innerHeight;
+				camera.updateProjectionMatrix();
+
+				renderer.setSize( window.innerWidth, window.innerHeight );
+
+			}
+
+			//
+
+			function animate() {
+
+				requestAnimationFrame( animate );
+
+				render();
+				stats.update();
+
+			}
+
+			function render() {
+
+				renderer.render( scene, camera );
+
+			}
+			
+			var selectionBox = new SelectionBox( camera, scene );
+    		var helper = new SelectionHelper( selectionBox, renderer, "selectBox" );
+
+			document.addEventListener("mousedown", function ( e ) {
+
+				for ( var item of selectionBox.collection ) {
+
+					item.material.emissive = new THREE.Color( 0x000000 );
+
+				}
+			
+				selectionBox.startPoint.set(
+					( event.clientX / window.innerWidth ) * 2 - 1,
+					-( event.clientY / window.innerHeight ) * 2 + 1,
+					 0.5 );
+    		} );
+
+    		document.addEventListener( "mousemove", function ( e ) {
+
+				if ( helper.isDown ) {
+
+					for ( var i = 0; i < selectionBox.collection.length; i++ ) {
+
+						selectionBox.collection[i].material.emissive = new THREE.Color( 0x000000 );
+
+					}
+
+					selectionBox.endPoint.set(
+						( event.clientX / window.innerWidth ) * 2 - 1,
+						-( event.clientY / window.innerHeight ) * 2 + 1,
+						0.5 );
+
+					var allSelected = selectionBox.select();
+
+					for ( var i = 0; i < allSelected.length; i++ ) {
+
+						allSelected[i].material.emissive = new THREE.Color( 0x0000ff );
+
+					}
+				}
+
+			} );
+
+			document.addEventListener("mouseup", function (e) {
+				
+				selectionBox.endPoint.set(
+					(event.clientX / window.innerWidth) * 2 - 1,
+					-(event.clientY / window.innerHeight) * 2 + 1,
+					0.5 );
+
+				var allSelected = selectionBox.select();
+
+				for ( var i=0; i < allSelected.length; i++ ) {
+
+					item.material.emissive = new THREE.Color(0x0000ff);
+
+				}
+
+			});
+
+		</script>
+
+	</body>
+</html>