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Question by kkkkkkkkkkkkkkkkkkkkkkkkkkkkk · Mar 29, 2017 at 02:53 PM · drag

drag a plane without jumping to center

I want to drag a plane around in world space, and the script does work so far, but the plane always jumps with its center to the mouse position. I want to grap it just anywhere in it and then drag it to another position and again. I guess, I have to calculate an offset, but have no idea how to do this – I tried a lot, can´t get it... I attached this to a plane

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

public class drag : MonoBehaviour {

 private Vector3 mousePosition;
 private Vector3 pos;
 bool dragit;
 float dist = 10;
 private void OnMouseDown()
 {
     dragit = true;
 }
 private void OnMouseDrag()
 {
     mousePosition = new Vector3(Input.mousePosition.x, Input.mousePosition.y, dist);
         pos = Camera.main.ScreenToWorldPoint(mousePosition);
     transform.position = pos;
 }
 private void OnMouseUp()
 {
     dragit = false;
 }

}

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Answer by Rhombuster · Mar 29, 2017 at 07:17 PM

I think I have figured it out. You need to get a point on your initial click, relative to the current transform position. Then offset it by that while it's moving. Here is the code:

 private Vector3 mousePosition;
 private Vector3 pos;
 private Vector3 initialPos;

 bool dragit;
 float dist = 10;
 private void OnMouseDown() {
     if (Input.GetMouseButtonDown(0)) {
         mousePosition = new Vector3(Input.mousePosition.x, Input.mousePosition.y, dist);
         initialPos = Camera.main.ScreenToWorldPoint(mousePosition) - transform.position;
     }
     dragit = true;
 }
 private void OnMouseDrag() {
     mousePosition = new Vector3(Input.mousePosition.x, Input.mousePosition.y, dist);
     pos = Camera.main.ScreenToWorldPoint(mousePosition);
     if(dragit)
         transform.position = pos - initialPos
 }
 private void OnMouseUp() {
     dragit = false;
 }

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avatar image kkkkkkkkkkkkkkkkkkkkkkkkkkkkk · Mar 30, 2017 at 09:04 AM 0
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Thank You a lot, this works perfectly.

avatar image $$anonymous$$ · May 20, 2020 at 12:10 PM 0
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Works Perfect! Thank you!

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