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Question by user-710 (google) · Oct 20, 2010 at 11:56 AM · guimatrixmatrix4x4

Can't set GUI.matrix...

Hi, Im trying to make my GUI resolution independent for certain low screen resolution.

Here is my code:

public void GUIMatrix() { Fraction res = new Fraction((long)Screen.width, (long)Screen.height);

 float width_ratio;
 float height_ratio;

 Fraction.ReduceFraction(ref res);

 if (Screen.width < 1300 && Screen.height < 1000)
 {
     if ((res.Numerator / res.Denominator) < 1.55) // Not widescreen
     {
         width_ratio = 1024f;
         height_ratio = 768f;
     }
     else // Widescreen
     {
         width_ratio = 1280f;
         height_ratio = 800f;

     }
 }
 else
 {
     width_ratio = (float) Screen.width;
     height_ratio =(float) Screen.height;

 }

 GUI.matrix = Matrix4x4.TRS(Vector3.zero, Quaternion.identity, new Vector3((1.0f * Screen.width)/width_ratio, (1.0f * Screen.height)/height_ratio, 1f));

}

The function is called OnGUI the first time, but when I press play in the editor I receive the following error:

NullReferenceException: Object reference not set to an instance of an object UnityEngine.GUI.set_matrix (Matrix4x4 value) (at E:/BuildAgent/work/68355d6e5d19d587/Runtime/Export/Generated/GUI.cs:64)

I really don't know what produces the issue... Anyone can help??

Thanks.

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Answer by user-710 (google) · Oct 20, 2010 at 12:23 PM

Solved!!

I was calling the function OnGUI() and Update(), and it can obly be called OnGUI().

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