1 model rendered 2 times?

FlipMESH render? Dunno about that; try this:

Graphics3D 640,480,0,2
SetBuffer BackBuffer()

cam=CreateCamera()
CameraClsMode cam,0,1
box=CreateCube()
base=90

While Not KeyDown(1)

base=base+1 : If base>360 Then base=base-360
x#=0+Cos(base)

PositionEntity box,x,0,5
RenderWorld
PositionEntity box,x,4,5
RenderWorld
Flip
Cls

Wend