Unity 3D, How can I detect if mouse is over a 2D Sprite even if the Sprite is not visible

Question

I work with the Unity3D game engine and I stumbled across this problem. When I try to check if the mouse is over a sprite, I can do so by using this callback.

private void OnMouseOver()
{
    // Do Something
}

But if the mouse is not directly over the sprite, this method won't work. Are there any alternatives?

The Orange sprite is the sprite I want to detect, but the blue circle makes it to not detect the mouse (This doesn't look really good, I am not an artist, but I should make things clear I hope)

Answer 1

If you want to know what object(s) are underneath your mouse click, use this:

• Physics2D.GetRayIntersectionAll(...)

Example - put it in your update:

if (Input.GetMouseButtonDown(0))
{
    var ray = Camera.main.ScreenPointToRay(Input.mousePosition);
    var hits = Physics2D.GetRayIntersectionAll(ray, 1500f);

    foreach (var hit in hits)
    {
        print($"Mouse is over {hit.collider.name}");
    }
}

For performance reasons, you may want to use:

• Physics2D.GetRayIntersectionNonAlloc(...)