Re: [Flightgear-devel] terrain incompatibility with current terragear libs

[Eric v. d. B. <eva...@ho...>]

On 11/05/2011 12:47 PM, Erik Hofman wrote:
> On Sat, 2011-11-05 at 13:23 +0100, Eric van den Berg wrote:
>    
>> Hello everyone,
>>
>> I am currently making some Terrain around ELLX using SRMT4 and CORINE
>> data. For that I used a current (approx. two weeks old) terragear
>> version, compiled against PLIB, OSG ans SIMGEAR of the same age.
>>
>> The Terrain generated works fine with current FG GIT, but gives errors
>> with both FG 2.0 and 2.4. If starting on these tiles, FG hangs at
>> start-up (indefinately) and flying to these tiles gives the error: "We
>> detected an error while reading the file." for each tile FG tries to load.
>>
>> So I re-compiled terragear against the FG 2.4.0 PLIB, OSG and SIMGEAR
>> versions...problem solved. Terrain works for all FG versions again.
>>
>> Not sure if this is a known issue, so I thought I'd share,
>>      
> There have been changes to both TerraGear and SimGear to be able to
> handle more detailed terrain. I assume this is one of the side effects.
>
> Erik
>
>    
After some more testing I found out that my 'solution' can produce 
terrain and every FG version can handle it, but it is extremely ugly. 
Some textures are just kind of stretched on the vertex, like someone 
combed it.
I guess it was just luck that current Terragear compiled with old 
Simgear, but it it doesn't work together in a way to make good terrain.

Also not all tiles produced with the current Terragear/Simgear produce 
an error. Looks like only bigger files are effected.

It also seems I am not the only one to have noticed this: 
http://www.flightgear.org/forums/viewtopic.php?f=5&t=13240&start=135 
<http://www.flightgear.org/forums/viewtopic.php?f=5&t=13240&start=135>
I just checked with Christians EHAM terrain...looks like the same problem.

So we now have a Terragear version that produces nice and more detailed 
terrain, but can only be seen with current GIT flightgear. As the 
fraction of people using older FG versions is large (>95%?...just a 
guess, correct me if you have an accurate number) the current Terragear 
version is not going to find many users.

Is there a way and/or will to fix the current Terragear / Simgear to be 
compatible with 2.4 and lower?

Thanks,

Eric


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