Resize RenderTexture at Runtime

Question

Hi there,

I'm wondering if there's a way to resize a RenderTexture while the game is playing.

If I try and modify the height/width during the game, it tells me that

Resizing of render texture that is loaded not supported!

I basically want to match a RenderTexture's resolution to the screen height and width at run time. Is there a way to access it prior to loading it in the scene? It seems that as soon as I access it, it loads (obviously), and then I can't programatically modify it.

Any and all help appreciated!

Answer 1

Best Answer

Answer by thebmxeur · Aug 14, 2014 at 07:48 PM

You can't resize a render texture but you can set a new one that is the size you need.

If you use the "camera.targetTexture" property (Unity Pro only) you can do :

 if ( camera.targetTexture != null ) {
     camera.targetTexture.Release( );
 }
 
 camera.targetTexture = new RenderTexture( Screen.width, Screen.height, 24 );

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ruudlenders · May 10, 2015 at 09:07 PM 1

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Thanks, this answer was really useful. Don't forget to reassign the texture to the mesh renderer!

unity_EB4D9554094BAF2E142B · Sep 29, 2022 at 12:26 PM 0

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Be aware that if stored in a seperate parameter ( RenderTexture nextTexture = new Texture(1920, 1080, 24) ) every new created texture continues to exist, even when the method is closed. The programm might crash if you infinitely create textures and leave them in memory. You could either use directly Destroy(nextTexture) or at any point System.Resources.UnloadUnusedAssets() to clear the memory.

Answer 2

Answer by Neohun · Sep 28, 2022 at 08:02 AM

Well, guys the answer by @thebmxeur is wrong if you release the render texture you can modify the width and height.. here is the proper version:

 void Resize(RenderTexture renderTexture, int width, int height) {
          if (renderTexture) {
             renderTexture.Release();
             renderTexture.width = width;
             renderTexture.height = height; 
         }
 }

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guneyozsan · Dec 24, 2022 at 12:52 AM 1

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I needed to add renderTexture.Create(); at the end for this to work.

Resize RenderTexture at Runtime

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