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This is the command m.nviz.scriptgrass that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

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 chosen interactively from the
GRASS monitor (-i) or 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:
-i
Intercative mode
The user selects the camera path from the GRASS monitor by clicking the left mouse
button along the route. Click the right mouse button to finish.

-f
Full render
The script will draw all loaded NVIZ data and save scene to PPM image.

-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 animation in sections.
For example the user may wish to start at frame number 2000.

route
The comma separated geographic coordinates for keyframe locations.
The interactive flag (-i) overrides this option.

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 -ik 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) otherwise 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 position(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 offers fine tuning of the speed (frame
rate) as well as editing individual 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.

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