javascript - Selecting object with mouse - Three.js - Stack Overflow

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I know that the question has already been asked. I want to be able to change the color of an object if selected with the mouse. I tried writing the code myself but it seems not to work, so I guess that I am missing something. That's basically the script:

    <script>
        var scene = new THREE.Scene();
        var camera = new THREE.PerspectiveCamera( 75, window.innerWidth/window.innerHeight, 0.1, 1000 );
        var renderer = new THREE.WebGLRenderer();
        renderer.setSize( window.innerWidth/2, window.innerHeight/2 );
        renderer.setClearColor( 0xcccccc, 1 ); 
        document.body.appendChild( renderer.domElement );
        scene.add(camera);

        var geometry = new THREE.Geometry();
        geometry.vertices.push(
            new THREE.Vector3( -5,  5, 0 ),
            new THREE.Vector3( -5, -5, 0 ),
            new THREE.Vector3(  5, -5, 0 )
        );
        var face = new THREE.Face3(0, 1, 2);
        geometry.faces.push(face);
        var material = new THREE.MeshBasicMaterial({color: 0x3300ff});
        var triangle = new THREE.Mesh(geometry, material);
        scene.add(triangle);

        camera.position.z = 10;

        document.addEventListener( 'mousedown', onDocumentMouseDown );

        function onDocumentMouseDown( event ) {    
            event.preventDefault();
            var mouse3D = new THREE.Vector3( ( event.clientX / window.innerWidth ) * 2 - 1,   
                                    -( event.clientY / window.innerHeight ) * 2 + 1,  
                                    0.5 );     
            var projector = new THREE.Projector();                                        
            var raycaster = projector.pickingRay( mouse3D.clone(), camera );
            var intersects = raycaster.intersectObjects( objects );

            if ( intersects.length > 0 ) {
                intersects[ 0 ].object.material.color.setHex( Math.random() * 0xffffff );
            }
        }

        var render = function () {
            requestAnimationFrame( render );
            camera.lookAt( scene.position );
            renderer.render( scene, camera );
        };

        render();
    </script>

If someone could help me I would appreciate it.

I know that the question has already been asked. I want to be able to change the color of an object if selected with the mouse. I tried writing the code myself but it seems not to work, so I guess that I am missing something. That's basically the script:

    <script>
        var scene = new THREE.Scene();
        var camera = new THREE.PerspectiveCamera( 75, window.innerWidth/window.innerHeight, 0.1, 1000 );
        var renderer = new THREE.WebGLRenderer();
        renderer.setSize( window.innerWidth/2, window.innerHeight/2 );
        renderer.setClearColor( 0xcccccc, 1 ); 
        document.body.appendChild( renderer.domElement );
        scene.add(camera);

        var geometry = new THREE.Geometry();
        geometry.vertices.push(
            new THREE.Vector3( -5,  5, 0 ),
            new THREE.Vector3( -5, -5, 0 ),
            new THREE.Vector3(  5, -5, 0 )
        );
        var face = new THREE.Face3(0, 1, 2);
        geometry.faces.push(face);
        var material = new THREE.MeshBasicMaterial({color: 0x3300ff});
        var triangle = new THREE.Mesh(geometry, material);
        scene.add(triangle);

        camera.position.z = 10;

        document.addEventListener( 'mousedown', onDocumentMouseDown );

        function onDocumentMouseDown( event ) {    
            event.preventDefault();
            var mouse3D = new THREE.Vector3( ( event.clientX / window.innerWidth ) * 2 - 1,   
                                    -( event.clientY / window.innerHeight ) * 2 + 1,  
                                    0.5 );     
            var projector = new THREE.Projector();                                        
            var raycaster = projector.pickingRay( mouse3D.clone(), camera );
            var intersects = raycaster.intersectObjects( objects );

            if ( intersects.length > 0 ) {
                intersects[ 0 ].object.material.color.setHex( Math.random() * 0xffffff );
            }
        }

        var render = function () {
            requestAnimationFrame( render );
            camera.lookAt( scene.position );
            renderer.render( scene, camera );
        };

        render();
    </script>

If someone could help me I would appreciate it.

• javascript
• three.js
• mouseclick-event

Share Improve this question Follow edited Oct 5, 2015 at 21:56 user128511 asked Oct 5, 2015 at 18:10 vixennvixenn 19722 gold badges55 silver badges1515 bronze badges 2

• 1 use eventcontrols ) alexan0308.github.io/threejs/examples/… – gevaraweb Commented Oct 5, 2015 at 21:42
• 1 Let me remind you that raycasting is done on CPU and is exceptionally slow. Better approach can be found by keyword "gpu picking": you'd like to render your scene with each clickable face having different color, and then just get a color of pixel by mouse coordinates. – polkovnikov.ph Commented Mar 20, 2017 at 21:40

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1 Answer 1

Sorted by: Reset to default 3

Updated your code and made jsfiddle

In onDocumentMouseDown added

var raycaster =  new THREE.Raycaster();                                        
raycaster.setFromCamera( mouse3D, camera );

instead of

var projector = new THREE.Projector();                                        
var raycaster = projector.pickingRay( mouse3D.clone(), camera );

To objects array added triangle mesh and updated size of the renderer. I suggest you to start using Console and do some debugging. You can easily find these errors yourself.

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