Ray casting not working

[lukebitts]

var geometry = new THREE.CubeGeometry( 30, 30, 30 );
var object = new THREE.Mesh( geometry, new THREE.MeshBasicMaterial({color:0x0000ff}) );
object.position.x = 0;
object.position.y = 200;
object.position.z = 0;

ray = new THREE.Ray(new THREE.Vector3(-500,210,0),new THREE.Vector3(500,210,0));
var c = ray.intersectObject( object );

am I forgetting something here? Because c is always empty but I don't see anything being done differently in the ray examples.

[mrdoob]

Could you do a jsfiddle of it?

[lukebitts]

http://jsfiddle.net/ttAgp/1/

[alteredq]

There is a known bug about non-planar quads, but CubeGeometry should be fine.

We should have some helper for Ray. Whenever issue like this pops up, I can never tell if there is a bug in Ray or just Ray is pointing somewhere to empty space (bear in mind second argument is direction vector, not end point of line starting in origin).

[mrdoob]

We should have some helper for Ray. Whenever issue like this pops up, I can never tell if there is a bug in Ray or just Ray is pointing somewhere to empty space (bear in mind second argument is direction vector, not end point of line starting in origin).

Indeed. Will work on that.

[WestLangley]

You need to call object.updateMatrixWorld() or render() prior to your call to ray.intersectObjects(). Also, as @alteredq pointed out, the second argument in the Ray constructor must be a direction vector -- of unit length.

[mrdoob]

@WestLangley well spotted!

Here's the fixed jsfiddle.

[lukebitts]

Thanks everyone :)