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Question by Avanak · Sep 27, 2014 at 12:39 PM · errorspriteruntimerenderer

Help with changing spririterenderer's sprite

I am making a 2d map of stars. All the stars get random parameters like color. I want to change the star's sprite according to it's color variable. Right now this is my code (JS) in the star objects, i change the sprite in the start function:

 function Start(){
     starColor = GenStarColor();
     starSpectrum = GenStarSpectrum();
     starTemperature = GenStarTemperature();
     starLuminosity = GenStarLuminosity();
     Debug.Log(starColor);
     Debug.Log(starSpectrum);
     Debug.Log(starTemperature);
     Debug.Log(starLuminosity);
     
     var starSprite = Resources.Load("redStar");
     GetComponent(SpriteRenderer).sprite = starSprite;
 }

The game compiles, but i get the error: InvalidCastException: Cannot cast from source type to destination type. starControler.Start () (at Assets/Scripts/starControler.js:33)

Also no sprite is attached to the star's spriterenderer.

I know that you could attach the sprite manualy in the inspector, but i am creating the star objects at runtime.

Anyone got an idea what i am doing wrong?

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avatar image Avanak · Sep 28, 2014 at 08:10 AM 0
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Bump, no one got an idea?

avatar image christoph_r · Sep 28, 2014 at 11:38 AM 0
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Which line exactly is line 33?

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Answer by Avanak · Sep 28, 2014 at 01:29 PM

I found the answer myself on this page http://forum.unity3d.com/threads/how-to-change-sprite-image-from-script.212307/

The code that works is:

 gameObject.GetComponent(SpriteRenderer).sprite = Resources.Load("Sprites/Stars/redStar", typeof(Sprite));


Still, thanks for the help

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Answer by grrlgglglr · Sep 28, 2014 at 12:16 PM

My guess is you're trying to assign a regular Texture directly to SpriteRenderer.sprite. You need to create a Sprite first. Try

 var starTexture = Resources.Load("redStar", typeof(Texture2D));
 var starSprite = Sprite.create(starTexture, ... ) // Add your import parameters here

to get a sprite object which you should be able to assign to the Sprite Renderer. Hope that helps.

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