SetBeamVisible(<-beamUID <-visible)

Set a beam to be visible or invisible. Invisible beams are not destroyed they are simply not visible.

once
   GetUnitPosition(self) ->unitPos
   #Fire a beam to extends off screen but is at the same height as the unit
   #We will attach the beam to ourselves, so that the start point is relative to our unit
   3 ->brightness
   4 ->width
   CreateBeam("orange" <-brightness <-width) ->beam
   AttachBeam(<-beam self "")
   SetBeamStart(<-beam V3(0 0 0))
   SetBeamEnd(<-beam V3(10000 0 10000))
endonce
 
if (GetUnitUpdateCount mod (30) eq (0))
   SetBeamVisible(<-beam <-vis)
   <-vis not ->vis
endif

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