![]() ![]() These files are, again, created by TerraGear tools and are usually gzipped, so you'll find that file stored as. They are usually called after the airport ICAO id: The scenery elevation file has cut out holes for airports, that are filled with such objects. Specifies airport geometry 'drop-in' files. The entry may be anywhere in the 942050.stg file, on a separate line. These files are generated by the TerraGear using the BTG file format, and have file extension ".btg" ("binary terragear" there used to be an "*.atg" file, too, where Specifies the terrain elevation data file. The meaning of these numbers is always the same and described under OBJECT_SHARED. Four of the available key words are followed by a string and four numbers. Stg files ("static terragear") define the static elements of a scenery "tile", including the terrain elevation data, airport geometry, and all static objects placed on this tile. This entry is copied from $FG_ROOT/Docs/README.scenery, which is part of FlightGear >0.9.10. When using ImageMagick's/ GraphicsMagick's convert, like with GIMP, it's necessary to either call the target file *.sgi or to specify the file type explicitly via sgi: prefix: They are automatically saved in highest possible compression (more aggressive than GIMP :-) KDE's krita/kolourpaint supports reading and writing of SGI images on the base library level, so all applications that can read/write images in general can also read/write SGI images. This is compliant with the file specification from SGI itself.) (The remark about SGI not supporting that is wrong. Using GIMP either save the image with extension *.sgi and rename it afterwards, or choose in the file dialog "Select Filetype" -> "Silicon Graphics IRIS image". Here are some free applications that create SGI images, along with some usage notes: ![]() Note that other sizes will not work, and FlightGear will use a red/white chequered texture instead! FlightGear textures shall be RLE-compressed, and as 'aggressively' as possible.Īll better graphics applications should be able to read and write the format, but often they load SGI images without problems, but only write them properly when the *.sgi extension is used. For example: 64圆4, 256x256 or 128x2048 (but textures have square size inside the graphic card so a 16x1024 texture is really a 1024x1024 texture). They must not use 16 bits per plane and must have side lengths of 2 nx2 m (powers of 2), the size must be at least 4 pixels when using compressed textures (automatic feature in the osg branch). SGI images can be uncompressed or RLE-compressed, which is a lossless compression method.įlightGear uses plib to read SGI images. This, however, is only a convention and not mandated by the SGI image specification. Images with one layer are usually black/white ( *.bw) or a mere alpha layer ( *.a), with two layers black/white with alpha, with three layers red/green/blue ( *.rgb), and with four layers red/green/blue/alpha ( *.rgba). Files of this format use different extensions, often to indicate the image properties, but in fact it's always the same format. This format supports multiple layers, transparency, compression, indexed colors, 8 bits and 16 bits per plane. These files are texture files in SGI Image Format. It can read and write *.ac files, but a written file may lack UV mapping or have other defects. This is a converter for all plib supported 3D formats and comes with FlightGear (see utils/Modeller/3dconvert.cxx). Compiling ppe may be a challenge, though, and it's only useful for viewing, but hardly for editing objects. This has the advantage that objects look very much like in FlightGear (minus shader effects and shadows). PrettyPoly (ppe) is an unmaintained object editor that uses the same graphics library as FlightGear (plib). The osgviewer demo in the Open Scenegraph Library is very useful for quickly looking at models. In Blender 2.49b import and export would be done from the file menu as File > Import/Export > AC3d (*.ac). Blender had built in support for importing and exporting AC3D files up to Blender 2.49b, and after that there are scripts available to do that of which some are developed by members of the FlightGear community. See Blender for the main article about this subject.īlender is a powerful and free (as in beer) open source 3D model editor (among other things). Many applications are able to import and/or export this format: It's ASCII text and easy to edit via scripts or, to some extent, by hand. The format is preferred by FlightGear (in essence the best supported format). These files contains meshes, UV-mappings, texture paths and material definitions. This is the native format for 3D graphics of the Invis AC3D application (payware with free trial version). See AC3D file format for the main article about this subject. 4.2 Size codes for groundnets and ramp/gate parking. ![]()
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