How to snap an object to the camera corner?

Question

C++ / C#

I have a 3D project in which I need to snap a cube to the camera corner so that at any screen resolution it will always be on the left. Can you please tell me how this can be implemented?

Answer 1

Launching a beam from the camera
Place a cube on this beam

cub.transform.position = camera.transform.position + ray.direction * 5;