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Mesh and landclass question

Where there are these odd gaps, the default mesh will show. Unless there is a large difference, you wouldn't notice.

I actually informed simviation of this many months ago, but I never got a response. The files need to be redone, or removed. Seriously, there is no excuse for it. The resample tool from Microsoft does a perfect job of resampling... so it had to be the fault of the developer. He used a bogus INF setup or botched batch file setup.

Making this mesh collection must have been tedious, but all terrain work ( mesh, landclass, waterclass, photoreal and LWM/VTP ) should be checked in TMF viewer before releasing it to the public... otherwise what you get is something as silly as this simviation mess.

The mesh could have been perfect, but the developer chose not to check his work. That tells me he really didn't know what he was doing... and that tells me he really didn't check for holes or spikes. He just used STRMv2 data which claims to have filled holes and spikes... but really hasn't fixed them all.

I know FS mesh, having worked with it for several years. Justin Tyme ( FSGenesis ) has reliable mesh for sale at a reasonable price. I just make my own.

Why don't I release mesh? I don't want to hear about water climbing hills, or the airfields being in holes or on plateaus! Every mesh developer has had to deal with this, and to do the job right, you would have to redesign all the elements of CFS2, FS2002 and FS2004 to match the mesh. That would actually take years.

FSX has already used a better default mesh, and other elements, and it is easier to resolve mesh difficulties for both the developer and the end-user. Good job, MS!

Dick
 
Here is an example of the sorts of issues that you can find with the SRTM mesh

The first shot is of the SRTM mesh from Simviation, the second is SRTM mesh of the same location released by Matthias Weidemann.

I don't mean to dis the person / people that did the work involved in creating SRTM based mesh for the whole world but if there is an area that you particularly love flying over it may be worth searching out other mesh sources.

Gavin
 
On en remet une couche ......

tmf viewver is easy to use to check the landclass Lwm vtp and mesh bgl.
There are some good mesh here in outhouse for Europe ,compare the first ,You know from where it comes and the second pics the Gary20 France they have some white gap but they are a right quality .
A fix could be easy make to remove these white gap at the boundary of each mesh bgl .

Ok j'arrête


JP
 
rhumbaflappy said:
Hi Gavin.

I'm editing this as I mistook your question for the simviation mesh.

Sometimes SRTM 90 meter data is refered to as SRTM3 This 90 meter data has gone through some revisions which have tried to clean up the data.

What is called "SRTM v4" is available at the CGIAR website. This is about as good as it will get for 90 meter data. There may be a need to hand-edit some files, but should be generally good up to LOD8 or LOD9. I think the files are geotiff format, and are a "mosaic" of smaller areas.

Detailed mesh areas in CFS2 are already sampled for LOD9, so either you'd need to delete the default LOD9 mesh for those areas, or resample at LOD10 ( not really recommended )

Dick
Click to expand...

Thanks for the clear answer Dick. LOD 9 (or even LOD 8, which gives better FPS) is usually more than detailed enough for flying and fighting (I think there is a reason that Microsoft went with LOD 9 for the areas that CFS2 was "supposed" to cover).

Next question is "is there a tutorial around for converting geotiff format to usable mesh? I think it a little more complicated than just running it thru SRTM2BGL

Thanks
Gavin
 
Hi Gavin.

I wouldn't even use STRM2BGL... that program has probably caused more mesh problems than any other. It's not that it's a bad program, but it tries to oversimplify the processs. SRTM2BGL was created to fill the viods in data of the SRTM HGT tiles, and then create a mesh from it. But the end result can be what ended up on simviation... and the developer has no idea how to fix the problem.

The CGIAR geotiff data has no voids, and covers a 5x5 degree area. It's not HGT.

What we need is a BIL file ( raw data ) made from these tiffs. Then you can make an INF file that resample will read to make perfect mesh.


I'll look around and see if there is a freeware tif to bil path so we can make a tutorial with that info.

Dick

PS.

I made some mesh to cover CST4a20 ( N = 0.0, S = -22.5, W = 120, E = 150 ... paupaNG and northern australia ):
LOD5 = 1.83 MB
LOD7 = 23.0 MB
LOD9 = 279 MB

and framerates are hit as the mesh detail rises. This leads me to believe that an LOD8 may be the upper limit, and possibly LOD7 in flatter areas.
 
Gavinc

In a previous post regarding Landclass and Mesh and the SRTM Data, you had referred to a Matthias Weidemann. As follows;

"The first shot is of the SRTM mesh from Simviation, the second is SRTM mesh of the same location released by Matthias Weidemann".

I see that this discussion is still ongoing under different titles and referrals are still being made to the SRTM Data at Simviation. I am not a expert ( by no stretch of the imagination ) by I do see what you meant by your postings with Rhumbaflappy.
As a matter of curiosity is this a freeware or payware rendering by M.W.? If freeware, WHERE DO I GET IT!? :jump:
 
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