Where to Put Your Data

Put your data in the following directories:

Data Location
Built structure data (VTST files)
 also profiles for linear structures (SHP)
Building models and textures, including
 facade textures (JPG, PNG, etc.)
Elevation data (BT and PRJ files)
 also ITF for TIN files
 also .ini for elevation tilesets
Geospecific images (JPG, TIF, BMP files)
 also .ini for imagery tilesets
See Using Your Own Imagery
Locations (LOC and VTAP) Data/Locations
Vegetation (species.xml and VF files) Data/PlantData
Vegetation billboard images Data/PlantModels
Raw (abstract) GIS files Data/PointData
Road data (RMF files) Data/RoadData
Skydome textures (hemispherical) Data/Sky
Terrain definitions (XML) Data/Terrains
Whole earth images for Earth view Data/WholeEarth

There are a few other folders used internally by the VTP software, including Data/Culture for standard culture models and textures, Data/Fonts for fonts, Data/GeoTypical for geotypical textures such as ocean and roads.  You generally won't need to add to or modify these folders.

Don't forget that in order to use the continuous LOD rendering, elevation files must be square-power-of-2-plus-1 in size.  For example:

513 x 513 1025 x 1025 2049 x 2049 4097 x 4097 8193 x 8193

If you have 3D models you want to import, they can be anywhere on your machine (if you use an absolute path) or anywhere on your Data path (for a relative address.)

Creating Your Own Terrain Settings

To make your terrain show up as a new terrain in the Enviro startup dialog, you can create your own .xml files in the Terrain folder on the data path.  The easy way to do this is with the Terrain Manager dialog.  Alternately, you can copy one of the existing .xml files (for example, Generic.xml) and edit it, either as a text file or with Enviro, to contain the settings you want.  The first element in the file ("Name") is the name that will appear in Enviro.