Attach 3d object to screen

Questions & Answers
1

I want to attach an object to my screen. (like object stays always in the center of the screen) I have one camera. I am currently not moving the, but I can’t position my object in the right place. Here is what i do:

void Start (){
//Find the camera
go=GameObject.Find("ARCamera");

// transform screen position to world position
Vector3 vector = new Vector3 (0, 0, 20);
Vector3 p = go.camera.ViewportToWorldPoint(vector);

//transform the object
transform.Translate(p,Space.World);
}
2

Just make your object as perent of camera (or other way around). Then just move perent object.
You can use local coordinates of child to adjust your object with your camera. (To use local coordenates press World button on uper panel)