Environment

Title
How can I make my entire model/drawing display in the viewer as I dolly out?
I am trying to add an environment, but when I press the Add Environment button on the toolbar, I get an error dialog with the message "Parameter is incorrect" and the Environment Information dialog does not appear.
How is a vehicle .h3d file different from an environment .h3d file?
How can I easily display the upper left and lower right coordinates of the Aerial Photo ...