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Edit lclookup.bgl?

davidk64

davidk64

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australia
At this link (https://www.fsdeveloper.com/forum/threa ... ng.433181/) there is a spreadsheet by Holger Sandemann showing mappings of land class names to texture file groups. Rows 7 and 8 on the "Region B" tab show that land class values 5 and 6 (Deciduous Broadleaf Forest and Evergreen Broadleaf Forests) are both mapped to the texture group with prefix "028b".

Q1. Is this mapping contained in lclookup.bgl located in "C:\Program Files\Lockheed Martin\Prepar3D v5\Scenery\BASE\Scenery"

Q2. Is it possible to edit lclookup.bgl?

Note: I'm not particularly looking to make that change. I'm interested in whether it's possible in general to remap land class values to texture file groups, and if so, how one goes about doing it.

I asked on the P3D forums but no luck as yet.
 
Yes, that is the correct file, and yes, the file contains the mappings of landclass IDs to texture set IDs. The basic format is a list of texture sets (containing much of the metadata in each row in the region B tab), then a list of region lookups with each region having a list of landclass and waterclass to texture set ID mappings (from your Q1). Then, for each landclass (not texture set) there is a list of slope remappings at 5.625 degree increments (16), then again for each landclass a list of vector texture remappings for Rails, Roads, Airport Boundaries, Streams, and Utilities (5). The basics of the algorithm that uses all of this data is here: https://online.fliphtml5.com/yyld/cvaw/#p=1

Editing this is possible and that formed the basis of much of the Orbx/FTX vector landclass products for FSX/P3D.
 
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With the aid of code provided by theisomizer I've been able to decompile and compile the lclookup.bgl file. Working on exporting and importing from Excel at present. One question I have is does anybody know if there is a file in P3D that lists the geographic region strings. I know they are in the learning centre and indeed in Holger's excel spreadsheet. The landclass strings are in terrain.cfg and I hoped I might be able to read the region strings from a P3D file as well. When you use the tmfviewer app the strings are shown when you mouse over pixels looking at regions.bgl so they are either hardcoded into the app or sourced from somewhere.

Note: the learning centre lists A to Y but the tmfviewer app shows New Zealand as 'Z' consistent with Holger's spreadsheet FSX list - so there is an inconsistency there.
 
The obvious answer is that they are based on the ICAO codes, but that's not so because 'Z' is mainland China and not New Zealand. Best guess then is that yes, they are hard-coded and don't represent the real world.
 
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