GRASS Tutorial for nviz

# NVIZ Reference Manual

CONTENTS

## Lighting Panel

The Lighting panel has options to control the position, color, and brightness of the lights. NVIZ uses a fill light and a main light. The fill light is a permanent dim white light directly over the surface. The main light controls the shading, which you adjust using the Lighting panel. As you adjust the lighting, a lighting model (sphere) appears on the surface and continually shows the effects of the lighting changes.

### OPTIONS

Follow Viewpoint
  Moves the light position with the view position (if selected). By default (off), the light remains fixed at the position set from the Lighting panel.
Show Model
  Draws the lighting model (sphere) in the viewer. The lighting model shows changes made to lighting parameters.
Brightness
  Adjusts the brightness of the main light.
Ambient
  Adjusts the ambient light associated with the main light and the brightness of the fill light.
Height
  Adjusts the main light height.
Red
  Adjusts the amount of Red in the main light.
Green
  Adjusts the amount of Green in the main light.
Blue
  Adjusts the amount of Blue in the main light.
Position Box
  Adjusts the main light direction. Click and drag the puck to change the light direction. The box annotations are North, South, East, and West.
Close
  Closes the Lighting panel.