How to get Orientation of Camera in THREE.js

Question

I am creating a 3d game using THREE.JS and the Web Audio API. One of the problems I am having is that I want to use the web audio Listener orientation, and define the listen

Answer 1

if your camera is a child of the player object .e.g. in FPS game. Do the same calculation on the player (parent of camera) , and use this (the Bullit gets the right direction, in this case from obj)

Bullit.prototype.getDirection=function(obj){
this.position.add(obj.position);
var pLocal = new THREE.Vector3( 0, 0, -1 );
var pWorld = pLocal.applyMatrix4( obj.matrixWorld );
var dir = pWorld.sub( obj.position ).normalize();
this.direction=dir;

}

Answer 2

You want to know the direction in world space in which the camera is looking.

In camera space, the camera is located at the origin and is looking down it's negative z-axis.

Pick a point in front of the camera in camera space:

var pLocal = new THREE.Vector3( 0, 0, -1 );

Now transform that point into world space:

var pWorld = pLocal.applyMatrix4( camera.matrixWorld );

You can now construct the desired direction vector:

var dir = pWorld.sub( camera.position ).normalize();

EDIT: Updated for three.js r.57

EDIT: Also see: three.js set and read camera look vector

Answer 3

In revision 69 (not sure in what revision it was introduced), you can call

camera.getWorldDirection()

to get the camera orientation vector.