Question by MorphVGX · Jun 11, 2015 at 12:22 AM · ui transform.position recttransform

RectTransform.TransformPoint returning zero everytime after Unity 4.6.3

RectTransform.TransformPoint and RectTransform.GetWorldCorners return zero after Unity 4.6.3 update, not in 4.6.2. It continues to fail in Unity 5 and 5.1.

         Vector3[] corners = new Vector3[4];
         rectTransform.GetWorldCorners(corners);

Doing t$$anonymous$$s:

         Vector2 bottomLeft = rectTransform.TransformPoint(rectTransform.rect.min);
         Vector2 topRight = rectTransform.TransformPoint(rectTransform.rect.max);

is the same. A zero result. Do anyone has t$$anonymous$$s problem? What to do? Thanks.

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DiegoSLTS · Jun 11, 2015 at 01:17 AM 0

I just tested with the simplest scene and script I could make, on Unity 5.0.2f1 Personal and this is not returning zero.

The scene is just a Main Camera and a Canvas with a Panel inside. The panel is stratched and has this script attached:

 using UnityEngine;
 using System.Collections;
 
 public class WorldCornersTest : MonoBehaviour {
 
     // Use this for initialization
     void Start () {
         RectTransform rectTransform = GetComponent<RectTransform> ();
         Vector3[] corners = new Vector3[4];
         rectTransform.GetWorldCorners(corners);
         for (int i = 0; i < corners.Length; i++)
             Debug.Log (corners [i]);
 
         Vector2 bottomLeft = rectTransform.TransformPoint(rectTransform.rect.min);
         Debug.Log (bottomLeft);
         Vector2 topRight = rectTransform.TransformPoint(rectTransform.rect.max);
         Debug.Log (topRight);
     }
 
 }

When I press play I get this output: (0.0, 0.0, 0.0) (0.0, 574.0, 0.0) (861.0, 574.0, 0.0) (861.0, 0.0, 0.0) (0.0, 0.0) (861.0, 574.0)

So, your problem must be somewhere else, can you share some more code? How are you getting that rectTransform reference? Maybe you're using a reference to a prefab instead of an instance of a prefab somehow, prefabs that has not been instantiated don't throw an error but make wierd things.

MorphVGX · Jun 12, 2015 at 07:29 PM 0

I discovered that I need to ask in Update until rectTransform.with is different from zero until I get proper values. So at some point the engine is ready for RectTransform.TransformPoint to work properly....