'Raycast from Camera to Mouse Position in Game World

When the mouse is at the Door (red area) i want to do something. I am trying to cast a Ray but the Ray doesn't hit the Door and i cant find where exactly it is hitting. Also how can i Debug.DrawRay this ray?

Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit hit;

if (Physics.Raycast(ray, out hit, Mathf.Infinity)) 
{
    if (hit.collider.tag == "InteractiveDoor")
    {
        doorInteractGameObject.SetActive(true);
    }
    else
    {
        doorInteractGameObject.SetActive(false);
    }
}

Unity Img

c++sharpunity3draycasting


Solution 1:[1]

You might need to create a LayerMask and add it to the parameters for Physics.Raycast; also make sure that the door has a collider on it. You would be surprised how many times I just forgot to add a collider.

In terms of drawing the ray in case this is not working for some reason. Use Debug.DrawRay. I recommend putting it in FixedUpdate() or Update(). Color and duration you can set to whatever you want but I recommend having depthTest be false since you want the ray to be drawn regardless. Then call it like:

Debug.DrawRay(ray.origin, ray.direction, <color>, <duration>, false);

Solution 2:[2]

You can draw this ray as:

Debug.DrawRay(ray.origin, ray.direction);

or

Debug.DrawRay(Camera.main.transform.position, Camera.main.ScreenPointToRay(Input.mousePosition).direction);

Option 1 is more direct once you've defined your ray, but option 2 gives you more choice to play around if it turns out this Ray doesn't behave the way you expect it to.

camera.ScreenPointToRay expects a Vector3 but Input.mousePosition returns a Vector2. The Unity docs on Vector3 and Vector2 appear that you should be able to use Vector2 as Vector3 implicitely and it'll populate the z component as 0, but if the Debug.DrawRay shows that the ray is the issue, then you need to append a 0. Maybe something like:

Ray ray = Camera.main.ScreenPointToRay(new Vector3(Input.mousePosition.x, Input.mousePosition.y, 0));

Solution 3:[3]

The fix is to go to your camera and set the tag to 'MainCamera'. Or you can modify your code to have a camera variable and use that variable instead of Camera.main.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 elveskevtar
Solution 2
Solution 3 Gurbela

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