I am new to Unity (came from AS3/Starling) and just started for 2D games in Unity. I have a spritesheet / texture-atlas (many different sized images packed in a single png) which I want to download at runtime (I can use WWW classes for that) in game .
Than use all those images (in that sprite atlas) and show them up on screen and use them as regular unity sprites, like applying Rigidbody2D or Collider2D etc. I googled for this but mainly what I found is using Unity3D's editor, importing the sprite atlas and using its own sprite editor. Not much on how I would do that in runtime. I am expecting something like what we used to do in Flash or evening in Cocos2d, like we have a related XML file for each sprite atlas and their SDK have functions for reading that sprite in conjunction with that XML.
Any help would be highly appreciated.