My draggable object wen i start to drag is become invisible

Unity Engine
1

I build a brand new cards game every thing is work with out any errors , But wen i start to drag my object in this case is a card in to the drop zone my card is not visible for some reason , i am not sure but i thing they out of screen range or some thing like that i can not find the way to correct this , i try to debug but there is no error on it so i am not able to find the way to solve this.
I have try to add the object and set it to mouse position but i still not see the object is not visible

This is my code for the draggable object

using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using System.Collections.Generic;
using UnityEngine.EventSystems;

public class Draggable : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler {
    private Vector3 mouseposition;
    private Rigidbody rd;
    private Vector2 direction;
    private float moveSpeed = 100f;

    public Transform parentToReturnTo = null;
    public Transform placeholderParent = null;
    public Transform card1xx1;
    public Transform card1xx2;
    public Transform card1xx3;
    public Transform card1xx4;
    GameObject placeholder = null;
    void Start()
    {
        rd = GetComponent<Rigidbody> ();
    }
    public void OnBeginDrag(PointerEventData eventData) {
        Debug.Log ("OnBeginDrag");
        placeholder = new GameObject();
        placeholder.transform.SetParent( this.transform.parent );
        LayoutElement le = placeholder.AddComponent<LayoutElement>();
        le.preferredWidth = this.GetComponent<LayoutElement>().preferredWidth;
        le.preferredHeight = this.GetComponent<LayoutElement>().preferredHeight;
        le.flexibleWidth = 0;
        le.flexibleHeight = 0;
        le.transform.position = Input.mousePosition;
        placeholder.transform.SetSiblingIndex( this.transform.GetSiblingIndex() );
      
        parentToReturnTo = this.transform.parent;
        placeholderParent = parentToReturnTo;
        this.transform.SetParent( this.transform.parent.parent );
      
        GetComponent<CanvasGroup>().blocksRaycasts = false;

    }
  
    public void OnDrag(PointerEventData eventData)
    {
        //Debug.Log ("OnDrag");
        Vector3 mouse = Input.mousePosition;
        card1xx1.transform.position = mouse;
        this.transform.position = eventData.position;
      
        if(placeholder.transform.parent != placeholderParent)
            placeholder.transform.SetParent(placeholderParent);
      
        int newSiblingIndex = placeholderParent.childCount;
      
        for(int i=0; i < placeholderParent.childCount; i++) {
            if(this.transform.position.x < placeholderParent.GetChild(i).position.x) {
              
                newSiblingIndex = i;
              
                if(placeholder.transform.GetSiblingIndex() < newSiblingIndex)
                    newSiblingIndex--;
              
                break;
            }
        }
      
        placeholder.transform.SetSiblingIndex(newSiblingIndex);

    }
  
    public void OnEndDrag(PointerEventData eventData) {
        Debug.Log ("OnEndDrag");
        this.transform.SetParent( parentToReturnTo );
        this.transform.SetSiblingIndex( placeholder.transform.GetSiblingIndex() );
        GetComponent<CanvasGroup>().blocksRaycasts = true;

        Destroy(placeholder);
    }
  

}
2

Instead of

this.transform.position = eventData.position;

put there this.transform.position = Vector3.Lerp(this.transform.position, eventData.position, 0.01f);
and you will see where is it going to
also you might want to Debug.DrawLine from positiion to target to see where it is intended to go

If it will move to slow, increase that 0.01f, it should be 0…1 where 0 is to stay in place and 1 is jump to target immediately

3

Tank you for the replay i have try to change the code but i continue to not bee able to see the card i send the print screen, i just start to drag but i still not bee able to see the card.

5053187--495827--nocard.jpg
5053187--495827--nocard.jpg1440×900 489 KB

4

I believe problem is this line.

this.transform.position = eventData.position

eventData.position is screen position and it looks like youre setting world position. See docs for Transform.TransormPoint and Camera.ScreenToWorldPosition