Pixmap SceneViewer::render(RenderManager* renderManager, Vec2i viewport) {
    // this is hilariously awful
    // but it's an improvement from what we had before, seriously...
    CameraState cameraState(rootSceneObject_.get(), focusNodeNameGuess());
    setCameraState(cameraState);
    Transformf cameraTransform = userCameraController_->cameraPosOri();
    cameraState.setCameraTransform(cameraTransform);
    lastRenderedCamera_ = cameraTransform;