r3.mkdspf - GRASS GIS manual

Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.

NAME

r3.mkdspf - Creates a display file from an existing 3D raster map according to specified threshold levels.

KEYWORDS

raster3d, display, voxel

SYNOPSIS

r3.mkdspf

r3.mkdspf --help

r3.mkdspf [-qf] input=string dspf=name [levels=float[,float,...]] [min=float] [max=float] [step=float] [tnum=integer] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

-q: Suppress progress report & min/max information
-f: Use flat shading rather than gradient
--overwrite: Allow output files to overwrite existing files
--help: Print usage summary
--verbose: Verbose module output
--quiet: Quiet module output
--ui: Force launching GUI dialog

Parameters:

input=string [required]: Name of an existing 3D raster map
dspf=name [required]: Name for output display file
levels=float[,float,...]: List of thresholds for isosurfaces
min=float: Minimum isosurface level
max=float: Maximum isosurface level
step=float: Positive increment between isosurface levels
tnum=integer: Number of isosurface threshold levels; Default: 7

DESCRIPTION
- Flags:
- Parameters:
Example:
NOTE
AUTHOR

DESCRIPTION

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:

r3.mkdspf phdata dspf=iso min=4.0 max=6.0 tnum=5
r3.mkdspf phdata dspf=iso levels=4.0,4.5,5.0,5.5,6.0
r3.mkdspf phdata dspf=iso min=4.0 max=6.0 step=0.5

NOTE

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.