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An explanation of used expressions and abbreviations.

SCASM

Scasm is the most important program for nearly all scenery design programs. EOD, Airport and many other similar programs produce Scasm-code, which is readable for human beings if one has enough knowledge about Scasm-code. Scasm translates this code into a scenery file, which is readable for FlightSimulator. These scenery files have the ending ".BGL".

Macro (Scenery Macro) 

Macros for Scasm are files which describe a single object, e.g. a house or a tree. These macros can be used several times in scenery. If you use a tree macro 40 times in you scenery and you want to change the texture for this tree, you only need to change the macro file. All these 40 trees will have a different texture. It's possible to write macro files without any tools, but most people use programs like FS Design Studio, EOD, Nova, VOD or another (CAD like) object design tool. All these programs assist you to design an object faster and easier, but the disadvantage is that none of these programs provide all special functions and possibilities which would be possible with Scasm. 
It's possible to edit Macros which were generated by an object design tool. Press Ctrl+J in EOD after you've created an API file to see the contents of this API file. Most of the Macro files have the file extensions *.SCM or *.API. 
API files come from the scenery design program called "Airport" and are more popular than SCM files. Many other scenery design programs can use API files. 
SCM files are mainly used in the scenery design program "ASD".

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