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Question by ZerotheLone · Dec 01, 2018 at 02:12 AM · uiscaling

How do I find a UI image to a real world size like cm/mm?

So I'm trying to find the real world size of an image that is scaled in the program with a slider. I want the real size of the letter so that I can display it while it is being scaled. The code that I have is:

 //Convert pixel size to CM
         float cmLetterSize = (ImagePixelSize * (2.54f / Screen.dpi)) / 6;

I'm converting to cm in this code. I shouldn't need to divide by 6 but for some reason when the screen changes the number I have to divide from changes. I find the pixel size of the object and then convert to cm. It doesn't work though because each time my screen size changes the number I have to divide by needs to be changed in the code. I'm not sure why this is. Could anyone help me with this?

This is my canvas settings: alt text

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Answer by hexagonius · Dec 01, 2018 at 12:25 PM

I'd try this:
https://docs.unity3d.com/ScriptReference/RectTransformUtility.PixelAdjustRect.html

The resulting width and height are in pixels. Since Unity already uses meters (1 unit = 1 meter), and I guess the conversion uses the CanvasScaler when doing it, dividing the resulting width or height by the Canvas Scaler's Reference Pixels Per Unit should give you units (meters)

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avatar image ZerotheLone · Dec 01, 2018 at 09:22 PM 0
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Thanks for the fast response. Just need some clarification, do you mean that once I use RectTransformUtility.PixelAdjustRect then I subtract an upper corner from a lower corner, I get pixel height. Then I would divide by the canvas scalar? Also, how do I get canvas scalar?

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