r3.mkdspf(1)

NAME
r3.mkdspf - Creates a display file from an existing grid3 file according to specified threshold levels.

KEYWORDS
raster3d, voxel

SYNOPSIS
r3.mkdspf
r3.mkdspf help
r3.mkdspf [-qf] input=string dspf=string [levels=float[,float,...]] [min=float] [max=float] [step=float] [tnum=integer]

  Flags:

-q  Suppress progress report & min/max information

-f  Use flat shading rather than gradient

  Parameters:

input=string
    Name of an existing 3dcell map

dspf=string
    Name of 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
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 3dcell 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.

AUTHOR
Bill Brown, bbrown@gis.uiuc.edu

Last changed: $Date: 2004/06/17 15:04:16 $

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