Enviro is the VTP runtime environment program.  It provides an interactive, realtime 3D navigation of your virtual terrain.  There are two primary view modes: Earth View and Terrain View.  At startup, you chose which view you want to start with, and you can switch at any time.

• Startup and Terrain Manager Dialogs
• Learn about Earth View
• Learn about Terrain View
  • Terrain Parameters / Style Dialog
  • Navigating with Mouse, Keyboard, Joystick, or SpaceNavigator
• Making Your Own Terrain
  • Where to Put Your Data
  • Using Your Own Imagery (Textures)
  • The Data Path (Where Enviro will look for data)
• Running the Application
  • Working with Culture Objects
  • Layer Dialog
  • Structure Layers
  • Abstract Layers
  • Image Layers
  • Keyboard shortcuts
• Notes for Developers
• Command-line Options

We apologize that the Enviro documentation is still rather small.
However, you may find most features to be self-explanatory.
Please check the FAQ then email any questions you may have.