CameraClsMode will let you build up one image from multiple cameras.
Graphics3D 800,600,0,2 SetBuffer BackBuffer() mainCam=CreateCamera() hudCam=CreateCamera(mainCam) : RotateEntity hudCam,0,180,0 : CameraClsMode hudCam,False,True inGameObject=CreateCube() : EntityColor inGameObject,100,100,255 hudObject=CreateSphere(8,hudCam) : EntityColor hudObject,100,255,100 PositionEntity hudObject,0,0,30 PositionEntity mainCam,0,0,-50 x=0 While Not KeyHit(1) x=x+1 If x>359 Then x=x-360 PositionEntity inGameObject,Sin(x)*20,0,0 RenderWorld Flip Wend