Three js, get the vector3 that pointerlockcontrolsi s facing

问题

Wondering if it's possible to get the way the yaw object in pointer lock controls is facing and use that as a direction for a raycaster. I've been toying around with the code, trying to add some basic shooter stuff to it. I've been trying a few things i've found on stack overflow with the X & Y values from the yaw object the pointer controls provides, but no luck. Here's what I have so far:

setupTarget: function() {
  //var vector = new THREE.Vector3(game.mouse.x, game.mouse.y, 0);
  var yaw = game.controls.getObject();
  var pitch = game.controls.pitchObject;
  var vector = new THREE.Vector3(
    yaw.position.x * Math.cos(pitch.rotation.x),
    yaw.position.y * Math.sin(yaw.rotation.y),
    0
  );
  var dir = vector.sub(yaw.position).normalize();
  this.ray = new THREE.Raycaster(yaw.position.clone(), dir);
}

I know that's wrong aside from it's not working. Was confusing some math for calculating x & y translation based on rotation, but that doesnt work for the target obviously.

回答1:

Add the following to your copy of PointerLockControls ( or wait a few days for the next release):

this.getDirection = function() {

    // assumes the camera itself is not rotated

    var direction = new THREE.Vector3( 0, 0, -1 );
    var rotation = new THREE.Euler( 0, 0, 0, "YXZ" );

    return function( v ) {

        rotation.set( pitchObject.rotation.x, yawObject.rotation.y, 0 );

        v.copy( direction ).applyEuler( rotation );

        return v;

    }

}();

three.js r.59

回答2:

Well, with the new Version it do not work. I have to add

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

before

v.copy( direction ).applyEuler( rotation );

because Firefox do not recognize v.

来源：https://stackoverflow.com/questions/18200372/three-js-get-the-vector3-that-pointerlockcontrolsi-s-facing

标签

javascript

math

three.js