How to make a 2D arrow on the screen that always point to a 3d object inside the AR Scene

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I want to display a 2D arrow on the screen that always moves to point to a 3D object in the AR scene.

The issue is how to measure the angle that should the arrow rotate to point the desired 3D object. Thanks in advance.

How To Make A 2D GUI Arrow Point At A 3D Object, How To Make A 2D GUI Arrow Point At A 3D Object 2D arrow position itself on my screen to point towards the enemy jet (3D Object). the arrow does not show for targets that are nearly past your position and nearly in view. Make a clear transition into AR. Use visuals to let users know they’re about to transition from a 2D screen into AR. You can dim the phone display or use effects to blur the screen when a transition is about to take place. In some apps, only one part of the experience will take place in AR. Try to give the user a seamless transition to AR.

Introduction to Computer Graphics, Section 3.2 -- 3D Coordinates , Points and objects are real things, but coordinates are just numbers that we assign to them so on how to construct a scene in 3D—what we have referred to as modeling. terms of a coordinate system in which the x- and y-axes lie in the plane of the screen, In 2D, a translation adds some number onto each coordinate. Casting a 2D screen point to a 2D plane in 3D space. Key Takeaway: You should consider if your object manipulation actually needs to be in 3D. Most Apps can likely simplify it to two, as in the

Use Unity's built in Transform.LookAt function

Positioning GameObjects - Unity, At the center of the Move Gizmo, there are three small squares you can use to drag but you should take care if you do this when there are child GameObjects, on Mac) to rotate the GameObject towards a point on the surface of any Collider. scale GameObjects as they appear on the screen, rather than in the Scene. A layer is 2D if it does not store z-values as part of its geometry. A 2D layer uses the values of the scene's elevation surface to draw in 3D space. The Buildings layer is a 2D layer. However, it's different from the other 2D layers in the scene because it does store elevation values—not as part of its geometry, but in another field.

Thank You all Guys, I got an Answer for two Situations : First One: When the two objects are in 3D

    public GameObject flesh;
    public GameObject target;
    // Start is called before the first frame update
    void Start()
    {
        flesh.transform.position = Camera.main.ScreenToWorldPoint(new Vector3( Screen.width/2, Screen.height/2,1));
    }

    // Update is called once per frame
    void Update()
    {
        var dir = Camera.main.WorldToScreenPoint(target.transform.position) - 
        Camera.main.WorldToScreenPoint(flesh.transform.position);
        var angle = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg;
        flesh.transform.rotation = Quaternion.AngleAxis(angle, Vector3.forward);
    }

Second: When the Flesh is an Image that Has RectTransform, , this solution Inspirational from @kevernicus

public GameObject Target;

    RectTransform rt;

    void Start()
    {
        rt = GetComponent<RectTransform>();
    }

    void Update()
    {
        // Get the position of the object in screen space
        Vector3 objScreenPos = Camera.main.WorldToScreenPoint(Target.transform.position);

        // Get the directional vector between your arrow and the object
        Vector3 dir = (objScreenPos - rt.position).normalized;

        float angle = Mathf.Rad2Deg * Mathf.Atan2(dir.y, dir.x);


        rt.rotation = Quaternion.AngleAxis(angle, Vector3.forward);
    }

Placing Objects and Handling 3D Interaction, To assist ARKit with finding surfaces, you tell the user to move their device in ways that First, you create a ray-cast query that defines the 2D point on the screen fatalError("Unexpected case: the update handler is always supposed to return at virtual object is not yet in the scene, add it. if virtualObject.parent == nil { self. An image is just a representation of a 3D scene on a flat surface: the surface of a canvas or the screen. As explained in the previous chapter, to create an image that looks like reality to our brain, we need to simulate the way an image of the world is formed in our eyes. The principle is quite simple.

[PDF] Perceiving 3D from 2D Images, that allow us to infer properties of the 3D scene from the 2D image. Although the A limb ( ) is formed by viewing a smooth 3D object, such as the limb of the human body While the surface points are continuous across the crease, the surface normal is The four arrows in the block at the left (B,E,G,I) all have the same. To make this 3D object look like it was made of bricks, I simply searched the Web for a brick texture, made a Sticker out of it, and stamped each side. Stickers are so powerful that I would even

Click on the canvas object that was created and change the UI scale mode from constant pixel size to scale with screen size. Click on the text object again and change horizontal overflow from wrap to overflow. Finally, (with the text still selected) click on the drop down on the top right to change the tag.

Because a 3D scene looks different depending on the onlooker's point of view, you must specify that point of view. The Camera class allows you to specify this point of view for a 3D scene. Another way to understand how a 3D scene is represented on a 2D surface is by describing the scene as a projection onto the viewing surface.

Comments
  • Please show some code
  • This won't actually work, as screen space and world space are very different. LookAt will neively utilize the screen space object's location as a world space coordinate due to how Unity actualizes things in the scene.
  • i used it before but it doesn't work due to the difference between screen and AR world coordination system
  • You have to convert screen space to world space and vice-versa. Camera has a method for this Camera.ScreenToWorldPoint