How to drag 3D game objects on X and Z axis? Keep Y axis constant

Question

Hello, I'm trying to make a 3D Drag and drop system game and I want to move my object around X and Z axis only. I don't know how to make it work though. Could anyone help please?

 public class DragAndDrop : MonoBehaviour
 {
     Vector3 offset;
     public string destinationTag = "DropArea";
 
     void OnMouseDown()
     {
         offset = transform.position - MouseWorldPosition();
         transform.GetComponent<Collider>().enabled = false;
     }
 
     void OnMouseDrag()
     {
         transform.position = MouseWorldPosition() + offset;
     }
 
     void OnMouseUp()
     {
         var rayOrigin = Camera.main.transform.position;
         var rayDirection = MouseWorldPosition() - Camera.main.transform.position;
         RaycastHit hitInfo;
         if (Physics.Raycast(rayOrigin, rayDirection, out hitInfo))
         {
             if (hitInfo.transform.tag == destinationTag)
             {
                 transform.position = hitInfo.transform.position;
             }
         }
         transform.GetComponent<Collider>().enabled = true;
     }
 
     Vector3 MouseWorldPosition()
     {
         var mouseScreenPos = Input.mousePosition;
         mouseScreenPos.z = Camera.main.WorldToScreenPoint(transform.position).z;
         return Camera.main.ScreenToWorldPoint(mouseScreenPos);
     }
 }

Answer 1

Answer by Jellogramming · Mar 30 at 11:50 PM

If your object has a rigidbody, then you can go into "Constraints" and check the Y box for "Freeze position". If it doesn't have a rigidbody, then this could work:

  float y;
     
     void Start(){
         y = transform.position.y;
     }
     
     void Update(){
         Vector3 pos = transform.position;
         pos.y = y;
         transform.position = pos;
     }

Hope this helps!

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Answer 2

Answer by LamborjimmyPOG · Mar 31 at 12:18 PM

It did work! Thank you so much!

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How to drag 3D game objects on X and Z axis? Keep Y axis constant

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