Question by NyeinChanAung · Mar 09, 2019 at 06:05 AM · camera viewport rect aspect-ratio

How does the aspect ratio work?

I'm testing to fit my game world to fit in every screen. I want to make my game only in portrait mode and showing letter box (black bars at top and bottom) is also fine. So I googled it and found a code snippet here. So I insert in my script the following parts.

     float targetaspect = 3.0f / 4.0f;
 
     // determine the game window's current aspect ratio
     float windowaspect = (float)Screen.width / (float)Screen.height;
 
     // current viewport height should be scaled by this amount
     float scaleheight = windowaspect / targetaspect;

     Camera camera = GetComponent<Camera>();
     Rect rect = camera.rect;
     rect.height = scaleheight;
     camera.rect = rect;

From the above code the game world and items inside it are show properly and are not clipped or cut off whatever the screen size is. That's what I want. But the question is how that code work? Why do I need to specify Camera Rect Height value? And why does [windowaspect/targetaspect] need? Can someone explain me or provide some learning resource about the Unity aspect ratio, camera, rect, etc?

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