Provided by: grass-doc_6.4.3-3_all 
NAME
d.nviz - Creates fly-through script to run in NVIZ.
KEYWORDS
display, visualization, raster, vector, raster3d
SYNOPSIS
d.nviz
d.nviz help
d.nviz [-ifckoe] input=name output=name [name=string]
[route=east,north[,east,north,...]] dist=float ht=float frames=integer [start=integer]
[--verbose] [--quiet]
Flags:
-i
Interactively select route
-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
--verbose
Verbose module output
--quiet
Quiet module output
Parameters:
input=name
Name of input raster map
output=name
Name of output script
name=string
Prefix of output images (default = NVIZ)
route=east,north[,east,north,...]
Route coordinates (east,north)
dist=float
Camera layback distance (in map units)
ht=float
Camera height above terrain
frames=integer
Number of frames
start=integer
Start frame number (default=0)
DESCRIPTION
The d.nviz 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 d.nviz 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 rast=elevation.dem
d.rast elevation.dem
d.nviz -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 d.nviz 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 d.nviz is run.
Alternatively, the user can run nviz with a previuosly saved state and the d.nviz
generated script:
nviz state=saved.state script=nviz.script.nvscr
Keyframe animator script
Running the script generated by d.nviz 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.
SEE ALSO
nviz
AUTHOR
Bob Covill
Last changed: $Date: 2011-11-08 03:29:50 -0800 (Tue, 08 Nov 2011) $
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