Unity 4.3 - 2D, how to assign programmatically sprites to an object

Question

I\'m trying to create an object that will be responsible of creating and showing different sprites, so I would like to access directly the assets/sprites programmatically instea

Answer 1

To create a sprite programmatically might be a little too difficult to do. You'd probably need to create a Texture in memory, fill in the data, and then write that texture on the disk. After that, you should be able to read that using C#'s File, or Unity's WWW.LoadFromCacheOrDownload.

Here is how you would create a texture dynamically: http://answers.unity3d.com/questions/9919/how-do-i-create-a-texture-dynamically-in-unity.html

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To load your sprites programmatically (not the ones created dynamically though), they need to be under a folder with the name Resources (which is a special folder).

I.e. suppose you have a sprite named MySprite.png under a folder named Sprites which is under a folder named Resources. You would then load it like this:

renderer.sprite = Resources.Load("Sprites/MySprite");

(notice how you do not include the Resources folder and the extension of the sprite)

You can find more details in the Loading Resources at Runtime documentation.

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PPtr cast failed when dereferencing!

I did some searching and found out from this forum post that usually that happens when you had a list of one type and then changed it into another type. I.e. if mySprites was at some point GameObject[] and you linked a bunch of Sprites, and then changed it to Sprite[]. And since it specifically says Texture2D, I'm assuming that the import settings of your Sprites (or some of them) are set to Texture instead of Sprite:

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Also, all MonoBehaviours have already a field named renderer, which is of type Renderer. I would suggest you rename that field to avoid confusion, unless you only used that as an example.