How to save result of GPU Perlin Noise (from shader) to a regular Texture2D?

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Not sure I am asking the question correctly.

Here is the asset, Turbulence Library. It generates various noises using a shader, but how can I convert the result into regular Texture2D?

So I be able to use it in other materials or save to file.

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Answer by tanoshimi · Nov 26, 2016 at 02:05 PM

You'd first use Graphics.Blit to draw the material using the Turbulence Library onto a rendertexture, and then use ReadPixels to copy from there to a regular Texture2D. Something like this:

 // Create a temporary render texture 
 RenderTexture temp = RenderTexture.GetTemporary(width, height, 0, RenderTextureFormat.ARGB32);

 // Draw to the RT (Texture2D.whiteTexture is just a dummy src)
 // mat is a material with the Turbulence Shader applied to it
 Graphics.Blit(Texture2D.whiteTexture, temp, mat);

 // Copy the rendertexture to a regular texture
 Texture2D tex = new Texture2D(width, height);
 tex.ReadPixels(new Rect(0, 0, width, height), 0, 0, false);
 tex.Apply();

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Artaani · Nov 26, 2016 at 03:41 PM 0

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Thanks for the reply! I copied the code, but for some reason, result texture is completely black. However if I select material in inspector - it displayed with turbulence.

tanoshimi Artaani · Nov 26, 2016 at 10:08 PM 0

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Is this a surface shader or a regular vert/frag shader? From memory surface shaders don't work well with Blit: https://forum.unity3d.com/threads/shaders-not-working-in-graphics-blit-when-using-my-own-rendertexture.98161/

Artaani tanoshimi · Dec 07, 2016 at 05:31 PM 0

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It took some time, but I figured out! Yes, it is surface shader, so it does not work, but it can be quite easily converted in fragment shader and it starts to work perfect!

Thanks you! :)

If someone will encounter the same problem - let me know, I will describe solution in more details.

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How to save result of GPU Perlin Noise (from shader) to a regular Texture2D?

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