BUG: [backward compat change]. GetActiveCamera() does not reset the camera anymore. If the renderer had no camera, it would create one automatically *and* reset it. This side effect would trigger the whole pipeline to get the props bounds. Moreover, a call to GetActiveCamera()->Foobar() would have different/inconsistent results depending on whether or not the renderer had a camera already. GetActiveCamera() still creates a cam, but does not reset it. If one calls GetActiveCamera(), it should have full control of it anyway at this point (and reset it or not). The old friendly behaviour remains though, if the user does not bother with the camera at all, it is created during the first render *and* reset to show the whole scene.