BlueMagnificent
4/2/2019 - 3:23 PM

Javascript 3D Physics Snippet Two

Javascript 3D Physics Snippet Two

index.html
content_copyfile_download

<html>
    <head>
        <meta charset="utf-8">
        <title>JS 3D Physics</title>
        <style>
            body { margin: 0; }
        </style>
    </head>
    <body>
        <script src="js/three.js"></script>
        <script src="js/ammo.js"></script>
        <script>

            //variable declaration section
            let physicsWorld, scene, camera, renderer

            //Ammojs Initialization
            Ammo().then( start );
            
            function start (){

                setupPhysicsWorld();

                setupGraphics();
                renderFrame();

            }

            function setupPhysicsWorld(){

                let collisionConfiguration  = new Ammo.btDefaultCollisionConfiguration(),
                    dispatcher              = new Ammo.btCollisionDispatcher(collisionConfiguration),
                    overlappingPairCache    = new Ammo.btDbvtBroadphase(),
                    solver                  = new Ammo.btSequentialImpulseConstraintSolver();

                physicsWorld           = new Ammo.btDiscreteDynamicsWorld(dispatcher, overlappingPairCache, solver, collisionConfiguration);
                physicsWorld.setGravity(new Ammo.btVector3(0, -10, 0));

            }


            function setupGraphics(){

                //create clock for timing
                clock = new THREE.Clock();

                //create the scene
                scene = new THREE.Scene();
                scene.background = new THREE.Color( 0xbfd1e5 );

                //create camera
                camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 0.2, 5000 );
                camera.position.set( 0, 30, 70 );
                camera.lookAt(new THREE.Vector3(0, 0, 0));

                //Add hemisphere light
                let hemiLight = new THREE.HemisphereLight( 0xffffff, 0xffffff, 0.1 );
                hemiLight.color.setHSL( 0.6, 0.6, 0.6 );
                hemiLight.groundColor.setHSL( 0.1, 1, 0.4 );
                hemiLight.position.set( 0, 50, 0 );
                scene.add( hemiLight );

                //Add directional light
                let dirLight = new THREE.DirectionalLight( 0xffffff , 1);
                dirLight.color.setHSL( 0.1, 1, 0.95 );
                dirLight.position.set( -1, 1.75, 1 );
                dirLight.position.multiplyScalar( 100 );
                scene.add( dirLight );

                dirLight.castShadow = true;

                dirLight.shadow.mapSize.width = 2048;
                dirLight.shadow.mapSize.height = 2048;

                let d = 50;

                dirLight.shadow.camera.left = -d;
                dirLight.shadow.camera.right = d;
                dirLight.shadow.camera.top = d;
                dirLight.shadow.camera.bottom = -d;

                dirLight.shadow.camera.far = 13500;

                //Setup the renderer
                renderer = new THREE.WebGLRenderer( { antialias: true } );
                renderer.setClearColor( 0xbfd1e5 );
                renderer.setPixelRatio( window.devicePixelRatio );
                renderer.setSize( window.innerWidth, window.innerHeight );
                document.body.appendChild( renderer.domElement );

                renderer.gammaInput = true;
                renderer.gammaOutput = true;

                renderer.shadowMap.enabled = true;

            }

        
            function renderFrame(){

                let deltaTime = clock.getDelta();

                renderer.render( scene, camera );

                requestAnimationFrame( renderFrame );

            }

        </script>
    </body>
</html>