Convert local point in RectTransform to screen space

Question

I need to convert a point in a RectTransform to screen space. Basically, I need to do the opposite of what RectTransformUtility.ScreenPointToLocalPointInRectangle does. I have looked at Transform.TransformPoint, except that I need points converted to screen space, not world space.

As an example, the point (0.5, 0.5) in the local space of a RectTransform should get converted to the screen space coordinates of the center of the RectTransform.

How can I accomplish this?

Answer 1

Answer by Tomer-Barkan · Apr 19, 2016 at 03:59 PM

use GetWorldCorners() or Transform.TransformPoint() and then use RectTransformUtility.WorldToScreenPoint().

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

     Debug.Log("Screen point1: " + new Vector3(rect.rect.xMax, rect.rect.yMin, 0) + rect.position);
     foreach (Vector3 corner in corners) {
         Debug.Log("World point: " + corner);
         Debug.Log("Screen point: " + RectTransformUtility.WorldToScreenPoint(null, corner));
         Debug.Log("Viewport: " + Camera.main.ScreenToViewportPoint(corner));
     }

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Answer 2

Answer by nisovin · Jul 22, 2015 at 09:54 PM

You should be able to use Transform.TransformPoint to convert from local space to world space, then use Camera.WorldToScreenPoint to convert to the screen point of the given camera.

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rahulkk · Jul 23, 2015 at 04:35 PM 0

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Could you provide a code snippet please? I have tried doing something like this before, but it didn't seem to work.

Tomer-Barkan · Apr 19, 2016 at 02:41 PM 0

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It doesn't work. the world coordinates it returns is relative to the canvas not the camera, so the second transformation will return a really large number.

I'm still trying to figure this one out myself.

Juskiesskalt Tomer-Barkan · May 31 at 10:28 AM 0

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I got it by just using RectTransform.TransformPoint. Correct me if I'm wrong but I believe this converts to screen space. At least in my testing this worked fine.

Convert local point in RectTransform to screen space

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