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Mesh                                                      Microsoft Flight Simulator
        Terrain mesh is the underlying wireframe detail of the    Microsoft Flight Simulator began as a set of articles
        scenery. The higher the resolution (elevation points), the  on computer graphics, written by Bruce Artwick
        greater the detail.                                       throughout 1976, about flight simulation using 3-D
                                                                  graphics. When the editor of the magazine told
        Normal Mapping
                                                                  Artwick that subscribers were interested in
        In 3D computer graphics, normal mapping, or Dot3
                                                                  purchasing such a program, Artwick founded
        bump mapping, is a technique used for faking the
                                                                  subLOGIC Corporation to commercialize his ideas. At
        lighting of bumps and dents - an implementation of
                                                                  first the new company sold flight simulators through
        bump mapping. It is used to add details without using
                                                                  mail order, but that changed in January 1979 with
        more polygons.
                                                                  the release of Flight Simulator (FS) for the Apple II.
        Non-Directional Beacon (NDB)                              They soon followed this up with versions for other
        A non-directional (radio) beacon (NDB) is a radio         systems and from there it evolved into a long-
        transmitter at a known location, used as an aviation or   running series of computer flight simulators.
        marine navigational aid.

        Object Libraries
                                                                  Plane Maker
        Many flight simulators require the use object libraries to
        display sceneries correctly. This includes those from     Plane Maker is a program bundled with X-Plane that
                                                                  lets users design their own aircraft. Using this
        both payware and freeware developers.
                                                                  software, nearly any aircraft imaginable can be built.
        OpenGL                                                    Once all the physical specifications of the airplane
        Open Graphics Library is a cross-language, cross-         have been entered (e.g., weight, wing span, control
        platform application programming interface for            deflections, engine power, airfoil sections, etc.), the
        rendering 2D and 3D vector graphics. The API is typically   X-Plane simulator will predict how that plane will fly
        used to interact with a graphics processing unit, to      in the real world; it will model the aircraft's
        achieve hardware-accelerated rendering. The flight        performance just like it does for X-Plane's built-in
        simulator X-Plane uses OpenGL.                            aircraft.
        PAPI                                                      Pitot-Static System
        A precision approach path indicator (PAPI) is a visual aid   A pitot-static system is a system of pressure-
        that provides guidance information to help a pilot        sensitive instruments that is most often used in
        acquire and maintain the correct approach (in the         aviation to determine an aircraft's airspeed, Mach
        vertical plane) to an airport or an aerodrome. It is      number, altitude, and altitude trend. A pitot-static
        generally located on the left-hand side of the runway     system generally consists of a pitot tube, a static
        approximately 300 meters beyond the landing threshold     port, and the pitot-static instruments.
        of the runway.
                                                                  Program Files (86)
        Physically Based Rendering                                When installing any of the Microsoft Flight
        Physically based rendering (PBR) is an approach in        Simulators (including P3D), it's always advised to
        computer graphics that seeks to render graphics in a      install outside of the 'Program Files' directory.
        way that more accurately models the flow of light in the
                                                                  Rudder
        real world. Both X-Plane 11 and later version of
                                                                  The rudder is typically mounted on the trailing edge
        Prepar3D use PBR.
                                                                  of the vertical stabilizer, part of the empennage.
        SIDs and STARs                                            When the pilot pushes the left pedal, the rudder
        A SID is sometimes called a Departure Procedure (DP).     deflects left. Pushing the right pedal causes the
        SIDs are unique to the associated airport. A STAR, or     rudder to deflect right. Deflecting the rudder right
        Standard Terminal Arrival Route, ('Standard Instrument    pushes the tail left and causes the nose to yaw to
        Arrival' in the UK) defines a pathway into an airport from   the right. Centering the rudder pedals returns the
        the airway structure.                                     rudder to neutral and stops the yaw.
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