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Question by PereGame · Jun 15, 2014 at 04:41 PM · 2dbackground

How to create an infinite, non-moving background in a 2D game

Hello, I'm very new to Unity. No experience. How could I create an background that when the character moves it goes on forever. Like in Flappy Bird the background stays planted By infinite I mean that by any resolution viewed, the background will be repeated. Please explain in steps.

Thanks!

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Answer by robertbu · Jun 15, 2014 at 05:08 PM

Assuming an orthographic camera:

  • Create a Quad that is sized for a single panel of the background and positioned for the background.

  • Make the Quad a child of the camera.

  • Create a background image that wraps. That is if you do an Offset on the horizontal in Photoshop, no seam appears.

  • Create a material with whatever shader you want and this texture.

  • Attach the following script to the Quad:


    pragma strict

    var factor : float;

    function Start() { factor = 1.0 / transform.localScale.x; }

    function Update() { renderer.material.SetTextureOffset("_MainTex", Vector2(Camera.main.transform.position.x * factor, 0.0)); }

Note this code assumes no 'y' movement of the camera, but this code is easily extended if your camera has 'y' movement.

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