Flightgear 20209/22/2023 Putting step (3) into > hardware is also very nice – cards like the nVidia GeForce are now doing > this. Also the ground station data hasnt been updated for a few years. The scenery can be of variable quality, some areas are great (LOWI, grand canyon, PHNL) but others lacking. GA, military jets and helicopters are well represented, and the 777 or 707 are both great. > Hence, putting step (4) into hardware is vital – you could easily need to > draw a million pixels for each time you read the mouse. FlightGear doesnt (yet) have a study level modern passenger airliner. One eyepoint, perhaps a hundred objects, > tens of polygons per object, hundreds of pixels per polygon. > The amount of work to do each of these operations goes up by one or two > orders of magnitude at each step. > On a machine without 3D hardware, the main CPU has to do everything. > On a $100 PC 3D card, you (or your OpenGL library software – which runs on > the main CPU) do (1), (2) and (3) and the hardware takes care of (4). > On a $100k SGI workstation, you do (1) and (2) and the hardware takes care of > (3) and (4) > On a $1M full-scale flight simulator visual system, you do step (1) in the > main CPU, and the hardware takes care of (2), (3) and (4) > Stuff you do per-pixel (shading, texturing, Z-buffering, alpha-blend) Stuff you do per-polygon or per-vertex (like > rotate/translate/clip/illuminate) Stuff you do per-object (like coarse culling, level-of-detail) Stuff you do per-frame (like reading the mouse, doing flight dynamics) > When you are drawing graphics in 3D, there are generally a hierarchy of > things to do: FlightGear uses metar data to produce live weather patterns in real time. Weather The simulator includes real-time weather patterns. Several instances of FlightGear can be synchronized to allow for a multi-monitor environment. > Here is a bit of general background information on OpenGL and 3D hardware > acceleration contributed by Steve Baker Updated by Curt Olson () Since FlightGear version 2020.1 it is possible to connect to VATSIM by using the open-source swift pilot client. Here’s a better explantion from the website for flight gear a GNU flight sim Cards that don’t have harware transform and lighting have to do any tranform and lighting on the CPU becase all the grapphics card does is draw the plogons and texture, well it’s something like that.
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