three. JS first person camera gun following

https://stackoverflow.com/questions/29311875/three-js-pointerlockcontrols-shooting-along-y-axis

If you are using PointerLockControls And you want to add an object that stays in front of the camera , You can use the following modes ：

var mesh = new THREE.Mesh( new THREE.SphereGeometry( 5, 16, 8 ), new THREE.MeshNormalMaterial() );
mesh.position.z = - 100; // some negative number

camera.add( mesh );

If you don't use it PointerLockControls, You can still use the same technology , You just need to make sure that you add the camera as a child of the scene .

scene.add( camera );
camera.add( mesh );

3、 ... and .js r.84