I think it would be good if a view entity would just get rendered after the scene and after the postprocessed fullscreenquad.

That would mean that the view entity attached to the view rendering the scene would be completely postprocessed and the one attached to the last postprocessing stages view wouldn´t be post processed. That seems the most logical way to me as I think that a flag wouldn´t really work.

I have no idea how far it is possible to have view and postprocessing at one time.

Edit:
Missed this part of one of jcls posts:

But why are view entites attached to views?
When are panels rendered?
Wouldn´t it then make more sense to sort views, view entities, panels, ... all together by layers and to allow rendering view entities into bmaps the way panels can be rendered into a bmap?
I could then just set the camera layer to 0, the one of my view entity to 1 andthe one of my camera.stage to 2, set the same render targets for camera and the view entity and could postprocess it in camera.stage.
Probably just some stupid, senseless thinking...

As far as I understand it works this way:

First, all views are rendered, including all postprocessing.

Then, view entities and panels are rendered, so they both appear above the postprocessed views but show no postprocessing themselves. I see my flare sprites over your Shade-C HDR effect but the flares dont contribute to the HDR effect itself.

View entities can probably be attached to a view only for rendering them with a certain aspect and arc, and also for rendering them into the target bitmap of that view. That was that thing that Grafton had his problem with.

You can see the rendering order when you check the layers. View entities appear above panels when they have a higher layer, this would not be possible when they were rendered before postprocessing. But views appear always below panels and view entities.

To come to a conclusion of this lenghty thread: There were two problems, view entities not being visible, and view entities not being subject to postprocessing. I hope we can now agree that the first one was just a script problem, but the second one is real.

The reason is that view entities were originally not meant to be part of the scene, they were meant as 3D panel elements. Thus they are not rendered together with the scene, but together with panels.

I'll check if I can change that in some way for postprocessing view entities. But in the mean time, you can easily use level entities for that purpose. Most other engines have no "view entities" anyway and nevertheless support guns, flares, etc. They just use a vec_for_screen function for placing an entity at a screen position. You can easily do the same when you want guns or flares to be subject to postprocessing.

I'm even willing to do that for you - donate some cool sun flare sprites to the community and I'll donate a script that renders them as light or sun flares, including postprocessing. Do we have a deal?