Clicking on the Background Color button will
allow you to use the Color Picker
to set new background color.
Clicking on the Ambient Color button will
allow you to use the Color Picker
to set the ambient color for the scene.
Background Image
Load allows you to use any pcx, jpg, tga, wal, swl or bmp file as
the background for your scene. (see the Pak File Tab for other
options).
Clear removes the current image from the
scene's background.
The Texture, Zoom, and Stretch
options determine how the background image is drawn.
Select the option that provides the best performance for
your system. (note that texture may not work on some
systems).