In the blitz3d folder. you might use cameraprojmode to avctivate and disable cameras. Then set the CameraClsMode of the Hud-Cam to "don't clear background", so it will render semitransparent hud elements correctly. You can position the Hud Camera and the Hud Quads or Sprites (note: Sprites don't support Fog) 10 thousand or so blitzunits away from the main scene.