three.js Unproject camera within group - camera

Question

I have a camera as child within a Group object and I need to get the origin/direction:
var cameraRig = new THREE.Group();
cameraRig.add( cameraPerspective );
cameraRig.add( cameraOrtho );
scene.add( cameraRig );
function relativeMousePosition () {
var canvasBoundingBox = renderer.domElement.getBoundingClientRect();
var mouse3D = new THREE.Vector3(0, 0, 0.5);
mouse3D.x = ((mouseX - 0) / canvasBoundingBox.width) * 2 - 1;
mouse3D.y = -((mouseY - 0) / canvasBoundingBox.height) * 2 + 1;
return mouse3D;
}
cameraRig.position.set(89,34,91);
cameraRig.lookAt(something.position);
cameraPerspective.position.set(123,345,123);
var dir = relativeMousePosition().unproject(camera).sub(cameraPerspective.position).normalize();
var origin = cameraPerspective.position;
The above code gives a origin + direction with the context of the cameraRig. When I exclude the camera out, having the scene as direct parent, it gives me the world origin/direction which I want. So how to incorporate the cameraRig to get world origin/direction, so I can do picking or whatever?
FIDDLE: https://jsfiddle.net/647qzhab/1/
UPDATE:
As mentioned in the comment by Falk:
var dir = relativeMousePosition().unproject(camera).sub(cameraPerspective.getWorldPosition()).normalize();
var origin = cameraPerspective.getWorldPosition();
The result is better, but not yet fully satisfiing, as the camera rotation seems not applied yet.

Answer 1

I need to update matrixWorld for the cameraRig:
cameraRig.position.set(89,34,91);
cameraRig.lookAt(something.position);
cameraPerspective.position.set(123,345,123);
cameraRig.updateMatrixWorld(true);
cameraPerspective.updateMatrixWorld(true);