Something I thought I was done with long ago: the terrain_max_vertex_level parameter hit me again!I've set it to 21 some time in the past and left it there.Now I incidentially stumbled over numerous articles in various forums discussing this parameter while devivering screenshots for different settings - and I was somehow puzzled about what dramatic consequences changing the parameter has!Some spoke about mesh poligons to be shifted on the virtual globe at higher settings, and the screenshots speak on their own - the differences are quite remarkable.Now that I use mesh with different resolutions at the same time (76m up to 9m), there are now three basic questions open for me which I hope some more knowledgeable people can answer:a) Can I leave terrain_max_vertex_level at a setting which corresponds to the LOD of the most detailed mesh I use, or shoud I reduce it in favor of reducing mesh errors, or do I need to set it to the LOD of the mesh with the least details?:( I think I remember having read somewhere patch 9.1 for FS9 opens up the possibility to display 9m mesh, is that correct os is 19m the maximum?c) Am I right when I say that the values of terrain_max_vertex_level correspond to LOD as follows: 21=19m, 20=36m, 19=72m and so on (multiples of 9 rounded up).And if that's correct, and FS9 can display 9m, does a value of 22 exist?Since I have some areas where can I see problems with the terrain (e.g. climbing water, airports at "mountains" etc.), I'm not longer sure that they're only caused by e.g. AFCADs with elevations not correct for the mesh I use.Could be that I use the wrong value for terrain_max_vertex_level, but what If I change it, will I loose details etc.?Andreas

i can only answer one question about the airports.this is because Fs2004 can't display sloping runways,so you get the cliff at one end.KLAS is typical example.i leave my vertex level at 20.i only use 38m mesh.so its all i need.you are right about the 9m mesh after patch i think,the Fsgenesis crand canyon is an example of this.rest of this is guess work... question a.i would leave it vertex set at 21 if you use 9m mesh question b.21 is highest setting,22 will not do anything.seem to remember reading this... hope this helps steve

The TMVL controls the maximum number of mesh points that the sim will display over a given area - really the distance between points - as you state, a TMVL of 21 = 19.2m, 20 = 38m, 19 = 76m.FS9 will not utilize 9.6m mesh - it's maximum is 19.2m if you've applied the 9.1 update, otherwise its 38m. FS8 did use 9.6 meter mesh, but FS9 will not - let's hope FSX revisits the 9.6m data.FS automatically uses the highest resolution mesh you have installed, regardless of the TMVL setting. If you have higher resolution mesh than the TMVL, then FS automatically will scale back that high res mesh to match the TMVL setting (if you've got TMVL set to 20, but are using 9.6m mesh, FS will automatically down-sample that mesh to 38m).What I'd like to know, but am unsure of, is whether TMVL affects the quality of things that flatten that landscape. Will the airport flattens and streams trenches look better with higher-res TMVL settings? I suspect so...and would explain some of the detail anomalies you describe.Best,sg