Camera.targetTexture has unintended behaviour with HDR?

Unity Engine
1

I am attempting to composite a PixelPerfect camera properly with other cameras. In the process I am using Camera.targetTexture. I set it to a low res texture in OnPreCull and back to null in OnPostRender.

There are two issues that arise:

1- It never actually renders to the texture I gave it. Instead it chooses to create it’s own copy in a temp buffer and write to that instead. Which I could live with if…

2- After the camera has completed drawing I blit the results in OnRenderImage with an alpha blended material so that I can composite it. However, this happens to occur on a texture that is of format Default (ie: ARGB32). I have attempted to move this blit into a command buffer but the result is always the same: blitting to a non HDR texture.

If anyone has any insight, especially the Unity folk who wrote the PixelPerfectCamera originally it would be helpful.

2

Don’t use OnRenderImage with OnPreRender and OnPostRender.

3

Note: I have attempted to move this blit into a command buffer but the result is always the same: blitting to a non HDR texture.

I am aware that is not the correct way to do things. But it doesn’t change the issue.

4

I am not talking about a command bugger.

I am talking about setting the targettexture in onPreRender, then doing your blitting in onPostRender.