Control - Set Visibile and Modifiable flags for views, volumes, and lights. The Visible flag decides if the volume will appear in the rendering. The Modifiable flag decides if the object will follow the translations, rotations and scalings that is done in the Navigator and the Animator . Next comes a list of all objects loaded into VolVis. Then there is a draw-bar for the amount of ambient light in the scene.
Ambient light is present everywhere in the scene except in the background.
It works a little bit like a haze, a mist. The color of the ambient light is controlled by its red, green and blue components. The same goes for the background color of the scene. If you set the background color the same as the ambient color the effect is much like a mist. All changes does not take effect until the Accept button is clicked.