Hi,
  I am digging into terrain tiles creation in order to get a few 
airports layout more close to reality. I wonder if there's an 
alternative or if there's even space to experiment new ways in getting a 
highly customized geometry (especially for airport terrain meshes).

I am not very satisfied about the TaxiDraw/Terragear pipeline because of 
its limitations in the mesh creation technique.
Using TaxiDraw rectangle blocks is not flexible enough to get proper 
custom geometry. I understand TerraGear is aimed at building airports 
layout from a specific data format and does not accept other kind of 
geometries for taxiway/runways/aprons.

Since terrain meshes are based on triangles, I see full flexibility in 
that (more than what's used today). I guess rectangle blocks (I refer to 
taxiway/runway/aprons) were choosen in order to get airport layouts 
quick and easy (automatic texture mapping and lighting positioning from 
standard source data) but are not mandatory. I would not be surprised if 
someone tells me I could model my own airport mesh using any kind of 
geometry, texture it with custom image files, position lights (border, 
middle, PAPI etc...), windsocks and so on. All without being stuck to 
TaxiDraw/TerraGear limitations. Maybe TerraGear would be used anyway 
when compiling the custom mesh to a suitable .btg file, even if it does 
not come from a .dat TaxiDraw output?

Well, what should I investigate for? I guess a good knowledge of the 
.btg file format would be a good first step, but ... here I get puzzled. 
I did find very few details on that. BTG stands for Binary TerraGear, 
right? Nothing more to know? Should I really read Terragear source code 
to get it clear? Should I search into Simgear docs?

I'd really appreciate if someone could share some thoughts about this 
topic with me. I'd like to try and get a high quality airport layout and 
I'm open to not very standard approaches if needed.

Curtis, I understand you are very busy with a lot of stuff, do you have 
any hints for me anyway?

thanks,
   Roberto


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