Something

function GM:CalcView( ply, origin, angles, fov )

//function ENT:TrackEntity( ent )
//function ENT:TrackEntity(ply, origin, angles, fov)

 //function MyCalcView( ply, origin, angles, fov )
  
   local oldview
   local view = {}
		
   view.origin =  origin + Vector(0,0,100)
   view.angles = Angle(90,0,0)
   oldview = oldview or view.origin
   
   		if( LocalPlayer():KeyDown( IN_FORWARD )) then
		//view.origin = view.origin + Vector(0,0,200)
		oldview = oldview + Vector(0,0,50)
		view.origin = oldview
		end
   /*if(view.angles == Angle(90,0,90)) then
	view.angles = angles + Angle(90,0,0)
	end
	*/
  //Msg(view.angles)
   return view

end