Unity 3D - Sprite with the same physical size

Question

I am trying to create an image with an accuracy of 5 cm x 8 cm on any device. The problem is this: the devices have different dots per inch (dpi), which means that I need different pixel sizes to create the image. How can I calculate these different pixel sizes?

My approach:

• Convert cms → inches

  float widthInches = 5f / 2.54f; // 1.9685f;

  float heightInches = 8f / 2.54f; // 3.1496f

• Find pixel size

  float realWidthSize = Screen.dpi * widthInches;

  float realHeightSize = Screen.dpi * heightInches;

I did these tests on my devices and the results were not as expected. Am I doing something wrong?

Answer 1

! DPI !

http://docs.unity3d.com/ScriptReference/Screen-dpi.html