GRASS Tutorial for nviz

# NVIZ Reference Manual

CONTENTS

## Volume Panel

The Volume (voxels) panel controls how loaded volumes are drawn. The bottom half of the panel has drawing style options. The top half has options to add, delete, select, and change attributes of the current volume.

### OPTIONS

Visualization type: Isosurfaces
  Sets the levels of values for drawing the volume(s) as isosurfaces.
Visualization type: Slices
  Sets the levels of values for drawing the volume as cross-sections.
Shading
  Sets the style of shading used for the volume.
  Gouraud
    Draws the volumes with a smooth shading to blend individual cell colors together.
  Flat
    Draws the volumes with flat shading with one color for every two cells. The volume appears faceted.
New
  Loads a new volume or volume constant.
Delete
  Deletes (unload) the current volume.
Isosurface Attribute
  You can use this menu to control the attributes of the current volume. First one or more isosurfaces have to be added with Add.
  threshold
    Loads a new raster or constant value to use as threshold for the current volume isosurface.
  color
    Loads a raster or constant color to drape over the current volume. This option is useful for draping imagery such as aerial photography over a DEM.
  mask
    Loads a raster or constant that controls the areas displayed from the current volume.
  transparency
    Loads a raster or constant that controls the transparency of the current volume. The default is completely opaque.
  shininess
    Loads a raster or constant that controls the shininess (reflectivity) of the current volume.
  emission
    Loads a raster or constant that controls the light emitted from the current volume.
Position
  Changes the x, y, and z position of the current volume.
Draw Current
  Draws the current volume.
Close
  Closes the Volume panel.