Creates a display file from an existing grid3 file according to
specified threshold levels. The display file is a display list
of polygons that represent isosurfaces of the data volume. If
specific levels are given, additional optional parameters
are ignored. Min or max may be used alone or together
to specify a sub-range of the data. The step
parameter is given precedence over tnum.
Flags:
-q
Suppress progress report & min/max information
-f
Use flat shading rather than gradient
Parameters:
grid3
Name of an existing 3D raster map
dspf
Name of output display file
levels
List of thresholds for isosurfaces
min
Minimum isosurface level
max
Maximum isosurface level
step
Positive increment between isosurface levels
tnum
Number of isosurface threshold levels
Default: 7
Example:
With grid3 data (phdata) in the range 3-7,
we only want to see isosurface values for the range 4-6.
Any of these commands will produce the same results:
Currently the grid3 file must be in the user's mapset since the
display files being created are specific to particular grid3
files and are contained in directories under them.
We should create a mechanism where users
may make display files from others' grid3 files without having to
copy them to their mapset.