Place and Scale Gameobject to the Screen Width and Height of the device

Questions & Answers
1

Hey everyone,

I am developing 2D Mobile games( using Orthographic camera Projection ) in Unity3D but I don’t know how to place and scale gameobject so that it fits the device entire width and height like a background image( using sprites for making gameobjects )

I used " Screen.Width " but it is not giving the exact values of the Screen size and I also used " ViewportToWorldPoint "method and I don’t think its the right approach.

Thank You!

2

Look at orthographic camera size in Unity’s Docs

based on that you can get the orthographic screen size in world units like this

float height = Camera.main.orthographicSize * 2;
 float width = height * Screen.width/ Screen.height; // basically height * screen aspect ratio

To know how big your sprite is in world units, you have to simply calculate it using Sprite.pixelsPerUnit

Then you can get the scale(s) you must use:

public SpriteRenderer spriteRenderer;
	void Start () 
	{
		float height = Camera.main.orthographicSize * 2;
		float width = height * Screen.width/ Screen.height; // basically height * screen aspect ratio

		Sprite s = spriteRenderer.sprite;
		float unitWidth = s.textureRect.width / s.pixelsPerUnit;
		float unitHeight = s.textureRect.height / s.pixelsPerUnit;

		spriteRenderer.transform.localScale = new Vector3(width / unitWidth, height / unitHeight);
	}