Scene View camera erroneously drawing into RenderTexture

I've got a camera in my scene that has a RenderTexture assigned to its TargetTexture. This camera is intended to not clear the RenderTexture (Background Type: None) and accumulate frames on its buffer from only one layer.

However, when I set it up this way, it never works properly because for some reason, the Scene View camera appears to be rendering into it first! I have an object in my scene that uses a material with the render texture assigned to it so I can see the contents in my scene. The objects from my specified layer draw into the render texture, but only after the Scene View has inexplicably drawn into it, so as I tumbled the Scene View camera around, I can see the background content of my Render Texture change.

Is this a bug or am I missing something in my setup to prevent this scene view camera takeover?

 

I've reported a similar bug, which causes a weird linking between scene view camera changes and game view ambient occlusion effect: https://fogbugz.unity3d.com/default.asp?1221220_d8126mc3k1ojp9vl

Maybe those are connected.

 

In a build, the same thing is happening except instead of the scene view camera, its my VR rig's camera that appears to be drawing into the RenderTexture. Seems like RenderTextures in HDRP cannot be relied on to only be drawn to the way you have them configured.

Anyone from Unity care to comment on this? Known bug?

 

I am seeing the same behaviour in my project now too.

 

Me too. I've submitted a bug report.

 

this issue is plaguing me again. can anyone from Unity comment?

@grahamwell can you share a link to your bug report?

 

Bump

 

Three years later and I have the same issue. Did someone other than Unity find a fix or workaround when using multiple cameras?

 

Errors like this can occur if you docks your game and scene side by side.

Typically it's only an error in that editor state.