Hey there. I've got a background camera rendering out some meshes to a RenderTexture. There is also a complex uGUI doing stuff with the user. Both of these have to run in parallel. I've found through profiling that calling a Camera.Render() on this background camera triggers Canvas.SendWillRenderCanvases() on the rest of the UI. What in tarnation! The background camera is set to have an empty event mask, and a culling mask of only one layer where it renders what it needs to. There are no UI elements on this layer. Has anyone seen this before? How do you tell a camera that it doesn't need to care about UI in any way, shape or form?