Why is my rigidbody getting stuck in the air when using mouse movement?

Question

I am working on a mobile game that allows a player to move around boxes using touch. I found that using mouse down/drag/up works like touch input on mobile.

My problem is that these boxes have a rigidbody on them, with gravity turned on, and while they can be moved around fine, occasionally, every 30 movements or so, the box, and whatever other box is next to it, gets stuck in the air. I am not sure whats going on here but would appreciate the help. Below is the code that I am using for moving my boxes.

 private void OnMouseDown()
     {
             distance = Camera.main.WorldToScreenPoint(transform.position);
             positionX = Input.mousePosition.x - distance.x;
             positionY = Input.mousePosition.y - distance.y;
     }
 
     private void OnMouseDrag()
     {
             Vector3 CurrentPosition = new Vector3(Input.mousePosition.x - 
             positionX, Input.mousePosition.y - positionY, distance.z);
             Vector3 WorldPosition = 
             Camera.main.ScreenToWorldPoint(CurrentPosition);
     }
 
     private void OnMouseUp()
     {
          rb.useGravity = true;
     }

I have looked at many different posts about the potential problem and I can say that the following are not the problems:

Time scale is set to 1.
The size of the box is 1, 1, 1 (Primitive box)
Gravity scale is set to -9.81

Answer 1

Best Answer

Answer by qobion · Feb 06 at 06:26 PM

try to put this OnMouseDrag() or in Update()

 if (Input.touchCount == 0)
      rb.useGravity = true;

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aperez440 · Feb 06 at 06:46 PM 0

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Hey thank you for taking the time to answer. Sorry I took so long to reply, I went out to lunch. I tried adding this to OnMouseDrag() and then Update() but the problem persists. Its so unusual because it only happens every once in a while. Also, I checked the debug inspector and it shows that gravity isn't being disabled when it is stuck in the air. Its almost like its getting stuck on something but theirs no colliders or anything for this to happen with.

qobion · Feb 06 at 06:52 PM 0

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Then its because OnMouseDrag isnt cancelled Try to put this OnMouseDrag function

 if (input.touchCount > 0 )
     {
                  Vector3 CurrentPosition = new Vector3(Input.mousePosition.x - 
                  positionX, Input.mousePosition.y - positionY, distance.z);
                  Vector3 WorldPosition = 
                  Camera.main.ScreenToWorldPoint(CurrentPosition);
     }

aperez440 · Feb 06 at 07:07 PM 0

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Hello again. So right before you commented this, I removed use gravity from all of the rigidbodys I had and wrote this

 private void FixedUpdate()
     {
         rb.velocity += new Vector3(0f, -9.81f * Time.fixedDeltaTime, 0f);
     }

Worked like a charm. They never got stuck again. Thank you for taking the time out of your day to help.

Why is my rigidbody getting stuck in the air when using mouse movement?

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