It is important, as will be seen, to relate the visual coordinates to the flight data model coordinates. It does not specify where in the FlightGear environment the model appears, which is specified by the latitude, longitude and altitude of the world coordinates. It also defines how the model moves, which axes represent pitch, roll and yaw. When the model is rendered in the FlightGear visual environment, it also decides the orientation of the model. This system provides a frame of reference for locating elements of a visual model with respect to its origin. The system for positioning significant features of the aircraft for use by the Flight Data Model will be called the FlightGear Flight Data Model Coordinate System, which does not include other systems used by the flight data model, only those that relate to the visual model. The system positioning objects of the 3d model will be called the FlightGear Visual Model Coordinate System. The coordinate system positioning models in the FlightGear environment will be called the FlightGear World Coordinate System. FlightGear needs at least one coordinate system to position the aircraft in the world environment, another to position the the parts of the aircraft model, and a third within the flight data model matching significant points in the aircraft model to the the flight data model. The Flight Data Model may define a number of coordinate systems, which some may be for internal use or are concerned with the flight model and of no concern to the modeler or the visual model. To simulate and model an aircraft, FlightGear may require a number of coordinate systems. The origin is positioned at a given location in the world coordinate system. Each of the three dimensional objects making up the model is positioned relative to a 3d origin (0,0,0). Each model is placed in this three dimensional world, but also may be (and generally is) composed from one or more three dimensional objects. I will call this the FlightGear World Coordinate system, which this document will only touch upon. FlightGear Coordinate Systems FlightGear Coordinate SystemsįlightGear positions models, whether static buildings or moving aircraft, in the three dimensional environment using latitude, longitude and altitude.
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