Question by cmcilwraith11 · Sep 15, 2019 at 09:10 PM · scripting problem movement gameobject controller drag

Moving on the XZ plane

Hi,

I have been around the internet, trying to figure out how to move an object on the XZ plane.

I have a script that almost works. Here it is:

using UnityEngine;

public class DragObject : MonoBehaviour

{ Vector3 dist; Vector3 startPos; float posX; float posZ; float posY;

 void OnMouseDown()
 {
     startPos = transform.position;
     dist = Camera.main.WorldToScreenPoint(transform.position);
     posX = Input.mousePosition.x - dist.x;
     posY = 0;
     posZ = Input.mousePosition.z - dist.z;
 }

 void OnMouseDrag()
 {
     float disX = Input.mousePosition.x - posX;
     float disY = 0;
     float disZ = Input.mousePosition.z - posZ;
     Vector3 lastPos = Camera.main.ScreenToWorldPoint(new Vector3(disX, disY, disZ));
     transform.parent.position = new Vector3(lastPos.x, 0, lastPos.z);
 }

}

My problem is when I attach it to my object, the object 'jumps' every time in the Y direction, if I use:

posY = startPos.y

If I use :

posY = 0

it still jumps up a little but then 'hops' towards the camera.

The script works perfectly for a regular object (eg a cube) but I am trying to use it for an imported object that doesn't have a box collider. So I have a cube, that isn't rendered, as a child object (hence the last line, which transforms the parent object (transform.parent.position).

Can anyone suggest a solution?

Thanks,

Connal

PS - Sorry about the formatting. Not quite sure why some of it is laid out 'nicely' and the rest is in a heap...

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