Javascript 3D Physics Object Creation

createPhysicsObjects.js

function createBlock(){
    
    let pos = {x: 0, y: 0, z: 0};
    let scale = {x: 50, y: 2, z: 50};
    let quat = {x: 0, y: 0, z: 0, w: 1};
    let mass = 0;

    //threeJS Section
    let blockPlane = new THREE.Mesh(new THREE.BoxBufferGeometry(), new THREE.MeshPhongMaterial({color: 0xa0afa4}));

    blockPlane.position.set(pos.x, pos.y, pos.z);
    blockPlane.scale.set(scale.x, scale.y, scale.z);

    blockPlane.castShadow = true;
    blockPlane.receiveShadow = true;

    scene.add(blockPlane);


    //Ammojs Section
    let transform = new Ammo.btTransform();
    transform.setIdentity();
    transform.setOrigin( new Ammo.btVector3( pos.x, pos.y, pos.z ) );
    transform.setRotation( new Ammo.btQuaternion( quat.x, quat.y, quat.z, quat.w ) );
    let motionState = new Ammo.btDefaultMotionState( transform );

    let colShape = new Ammo.btBoxShape( new Ammo.btVector3( scale.x * 0.5, scale.y * 0.5, scale.z * 0.5 ) );
    colShape.setMargin( 0.05 );

    let localInertia = new Ammo.btVector3( 0, 0, 0 );
    colShape.calculateLocalInertia( mass, localInertia );

    let rbInfo = new Ammo.btRigidBodyConstructionInfo( mass, motionState, colShape, localInertia );
    let body = new Ammo.btRigidBody( rbInfo );


    physicsWorld.addRigidBody( body );
}


function createBall(){
    
    let pos = {x: 0, y: 20, z: 0};
    let radius = 2;
    let quat = {x: 0, y: 0, z: 0, w: 1};
    let mass = 1;

    //threeJS Section
    let ball = new THREE.Mesh(new THREE.SphereBufferGeometry(radius), new THREE.MeshPhongMaterial({color: 0xff0505}));

    ball.position.set(pos.x, pos.y, pos.z);
    
    ball.castShadow = true;
    ball.receiveShadow = true;

    scene.add(ball);


    //Ammojs Section
    let transform = new Ammo.btTransform();
    transform.setIdentity();
    transform.setOrigin( new Ammo.btVector3( pos.x, pos.y, pos.z ) );
    transform.setRotation( new Ammo.btQuaternion( quat.x, quat.y, quat.z, quat.w ) );
    let motionState = new Ammo.btDefaultMotionState( transform );

    let colShape = new Ammo.btSphereShape( radius );
    colShape.setMargin( 0.05 );

    let localInertia = new Ammo.btVector3( 0, 0, 0 );
    colShape.calculateLocalInertia( mass, localInertia );

    let rbInfo = new Ammo.btRigidBodyConstructionInfo( mass, motionState, colShape, localInertia );
    let body = new Ammo.btRigidBody( rbInfo );


    physicsWorld.addRigidBody( body );
    
    ball.userData.physicsBody = body;
    rigidBodies.push(ball);
}


function updatePhysics( deltaTime ){

    // Step world
    physicsWorld.stepSimulation( deltaTime, 10 );

    // Update rigid bodies
    for ( let i = 0; i < rigidBodies.length; i++ ) {
        let objThree = rigidBodies[ i ];
        let objAmmo = objThree.userData.physicsBody;
        let ms = objAmmo.getMotionState();
        if ( ms ) {

            ms.getWorldTransform( tmpTrans );
            let p = tmpTrans.getOrigin();
            let q = tmpTrans.getRotation();
            objThree.position.set( p.x(), p.y(), p.z() );
            objThree.quaternion.set( q.x(), q.y(), q.z(), q.w() );

        }
    }

}