Resolved RenderTexture scale incorrect after using Compute Shader, if texture quality is set to half.

carcasanchez · Apr 16, 2021

(coming from this thread)
Hello,
I have been toying with a simple compute shader, and I have stumbled upon a very curious error.
The final render texture has the correct dimension, but the image only covers 1/4 of the texture. The rest of the texture is black.

After some back and forth, I have found that changing Texture Quality from Half to Full solves the problem.
This behaviour is a bit strange for me, and I have not found any documentation about it. Could be it a bug?

carcasanchez · Apr 19, 2021

Quoting Bgolus, if anyone reaches here looking for info:

bgolus said: ↑

Yeah, that's the intended behavior. When you set the texture quality to less than full res it changes what gets sent to the GPU. The CPU side asset isn't being changed, and the resolution & texture seen by c# is going to be the asset's imported resolution for the current build platform selected. But the GPU is only getting a version of the texture with N mip levels removed from the top (depending on what texture quality setting you've chosen).

For anything you do in-game, you'll want to check what the current texture quality setting is and adjust the texture size you send to your shader properties accordingly. But for in-editor I would suggest one of two options: set the texture quality to full res in the script and set it back afterward, or change the import settings for the source textures to disable mip maps.
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Resolved RenderTexture scale incorrect after using Compute Shader, if texture quality is set to half.

carcasanchez

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