Terry,
    I have a couple of suggestions based on our use:
1.  Units.  My database defaults to being built in degrees.  I would
prefer meters, which can be achieved using the --range option.
Not sure here. Our source data is GeoTiffs in feet, and the resulting DB units are feet, without having to specify any options on the command line.

6.  Creator loads up my .flt files in bad, indescribable, uneditable
ways (probably due to my horribly outdated version of Creator).

We had to convert the mesh nodes to triangles in creator as well as flatten the transforms. Otherwise we had all kinds of issues. Couldn't edit certain areas, crashes, lighting errors, etc. This was with a fairly recent version of creator.

7.  I need the output image files to be separate from the terrain
files when editing .flt.  I don't see a way to build tiles with
separate image files, but I think I've seen a code snippet somewhere
for extracting images.  Other options are welcome.

If you output to "osg" you can get the images as separate files. The folowing worked for us: "--RGB_24 --image-ext rgb -o foo.osg" Don't remember why, but there was some logic in the code that didn't output the textures separately if you generated ive files. I keep meaning to go back and code up a patch for that, but havent had a chance. This was a few months ago, so maybe this has changed.

8.  I still need to work out the reasons for the big file size
differences between my output .ive files and the .flt files I convert
them too.  Converting back to .osg I noticed huge lists of Geodes each
containing one triangle.  Maybe I can do some tri-stripifying when
converting back from .flt to .ive.
As I mentioned in a previous email. If you are generating "TERRAIN" based files from vpb, the process of going to flt and then back to ive, will give you geometry, and that will be a huge size difference. If have vpb generate geometry already, I'm not sure why that would happen.

Martins


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