m.nviz.script(1grass) GRASS GIS User's Manual m.nviz.script(1grass)
NAME
m.nviz.script - Creates fly-through script to run in NVIZ.
KEYWORDS
miscellaneous, graphics, raster, raster3d, vector, visualization
SYNOPSIS
m.nviz.script
m.nviz.script --help
m.nviz.script [-fckoe] input=name output=name [name=string]
[route=east,north[,east,north,...]] dist=float ht=float frames=integer
[start=integer] [--overwrite] [--help] [--verbose] [--quiet]
[--ui]
Flags:
-f
Full render -- Save images
-c
Fly at constant elevation (ht)
-k
Include command in the script to output a KeyFrame file
-o
Render images off-screen
-e
Enable vector and sites drawing
--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=name [required]
Name of input raster map
output=name [required]
Name of output script
name=string
Prefix of output images (default = NVIZ)
route=east,north[,east,north,...]
Route coordinates (east,north)
dist=float [required]
Camera layback distance (in map units)
ht=float [required]
Camera height above terrain
frames=integer [required]
Number of frames
start=integer
Start frame number (default=0)
DESCRIPTION
The m.nviz.script program allows the user to easily create a script
that can be run in NVIZ to fly through a terrain. The NVIZ flight path
can be supplied on the command line as comma separated coordinates. The
program optionally allows a KeyFrame file to created (after running the
script). This KeyFrame file can be loaded into the Keyframe Animation
panel for fine tuning or editing.
The script generated by m.nviz.script can be run from the NVIZ command
line (nviz script=script_name) or after NVIZ is started by selecting
Scripting->Play Script.
OPTIONS
Flags:
-f
Full render
The script will draw all loaded NVIZ data and save scene to PPM im-
age.
-c
Flay at constant elevation
With this flag the camera will be set to an elevation given by the
ht= parameter. The default is to fly at ht= above the topography
(i.e. camera height = elevation + ht)
-k
Output KeyFrame file
Generate a KeyFrame file that can be loaded from the NVIZ Keyframe
Animation panel. The KeyFrame file is automatically assigned the
script name with a .kanimator extension.
-o
Render the animation in an off-screen context
-e
Enable vector and sites drawing
Parameters:
input
The name of the GRASS raster map with elevation data.
This should be the same file that will be loaded in NVIZ.
output
The name of the NVIZ script to create.
name
The prefix for output images if running in full render mode (-f).
The defulat preifix is NVIZ (eg. NVIZ0000.ppm).
dist
The distance of the camera behind the center of view.
ht
The height of the camera above the center of view.
If the the -c flag is set, the height represents the actual camera
height.
frames
The number of frames in the animation.
start
The starting frame number (default = 0).
This option may be useful in full render mode when creating an ani-
mation in sections. For example the user may wish to start at frame
number 2000.
route
The comma separated geographic coordinates for keyframe locations.
EXAMPLE
To interactively create an NVIZ animation from raster elev.rast with
500 frames and the camera set to 50 meters above and 250 meters behind
the scene, run the following:
g.region raster=elevation.dem
d.rast elevation.dem
m.nviz.script -k input=elevation.dem output=nviz.script dist=2400 ht=1220 frames=1000
In the above the example the user is prompted to select the route from
the GRASS monitor. The output script, ’nviz.script.nvscr’, can then be
run in NVIZ:
nviz elevation=elevation.dem script=nviz.script.nvscr
NOTES / HINTS
The user must select at least four key-frame locations (points) other-
wise an error is generated.
If the GRASS region is changed the m.nviz.script command must be
re-run.
The current GRASS region and the user supplied parameters are included
as a comment at the top of the output script. This information can be
used to easily re-create the animation.
The camera position is calculated backwards from the supplied posi-
tion(s). It is possible that the camera position will lie outside the
current window, in which case a non-fatal error is generated (Error:
selected point is outside region). This error can result in jerky
movements during the animation. To correct this problem reduce the
dist= parameter or increase the current region.
Loading the script into NVIZ
The user can run the script at arbitrary resolution. To re-run it at
higher spatial resolution or different settings, the user first loads
the surface and sets the resolution, lighting, etc. Then internally the
script generated by m.nviz.script is run. Alternatively, the user can
run nviz with a previuosly saved state and the m.nviz.script generated
script:
nviz state=saved.state script=nviz.script.nvscr
Keyframe animator script
Running the script generated by m.nviz.script within NVIZ, a new script
for kanimator (keyframe animator) is created. The kanimator panel of-
fers fine tuning of the speed (frame rate) as well as editing individ-
ual frames or inserting new frames. This new kanimator script has to be
loaded from the Kanimator panel in NVIZ. In the Kanimator panel there
are Save and Load button which allow the user to save and re-load a
kanimator script. Once loaded, the key frames will appear in the GUI
and can then be edited there.
SEE ALSO
wxGUI 3D viewer (NVIZ)
AUTHOR
Bob Covill
SOURCE CODE
Available at: m.nviz.script source code (history)
Accessed: unknown
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GRASS 7.8.7 m.nviz.script(1grass)
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