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Question by MUGIK · Dec 29, 2019 at 04:55 PM · c#renderingoptimizationrendertextureoptimisation

Count colored pixels of RenderTexture and get this data on CPU.

I need to calculate pixels of RenderTexture that are colored(alpha > 0). So I need to get pixels data inside C# script. My render texture is 16x16 pixels.

I have tried many things:

  1. Texture2D.ReadPixels() - very slow.

  2. Graphics.CopyTexture() - does not work with Texture2D.

  3. AsyncGPUReadbackRequest - does not work on Android.

  4. Texture2D.ReadPixels() but on a thread - works only on the main thread.

  5. ComputeShader - does not work on low-end Android devices

  6. Custom shader - can't read data directly from shader(GPU) so this also requires to read pixels from render texture.

So my guess that there is no way to get pixels to C# script fast. But maybe there is a way to just count colored pixels of the RenderTexture.

And again, the main problem is that reading pixels from RenderTexture to Texture is very slow. On Android it takes 10ms.

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avatar image lgarczyn · Dec 30, 2019 at 01:37 AM 0
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Your texture is barely 256 pixels, a simple ReadPixels should work fine on any device. Are you sure this is what is causing the performance issues? How many times are you doing it per frame?

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