[GRASS-user] Regarding NVIZ and d.slide.show

Gerald Nelson gnelson at uiuc.edu
Mon Feb 5 03:47:13 EST 2007

Would it be possible to post a sample or two, perhaps of an animated gif? It might be a really powerful 'marketing' tool.


---- Original message ----
>Date: Mon, 5 Feb 2007 14:55:59 +1300
>From: Hamish <hamish_nospam at yahoo.com>  
>Subject: Re: [GRASS-user] Regarding NVIZ and d.slide.show  
>To: "yuri bay" <ksh_wong at msn.com>
>Cc: grassuser at grass.itc.it
>yuri bay wrote:
>> I am trying to use the NVIZ for simulation animation and is wondering
>> if it can be used for the following scenario: to move a point from
>> one position to another for a period of time, for a series of
>> different positions. I know  NVIZ can be used for 3D animation, but
>> what about the 2D vector-based animation just mentioned?  If NVIZ can
>> be used for this purpose then would anyone tell me where can I find
>> the information on how to use it?
>I have now added some examples to the Wiki animations page:
>  http://grass.gdf-hannover.de/wiki/Movies
>    * 1 Q: How to construct high-quality MPEG-4 movies (animations)
>           from a series of still frames?
>    * 2 Q: How to generate an animated GIF, FLI, or MNG?
>    * 3 Q: How to create dynamic surface movies in NVIZ
>    * 4 Q: How to animate a time series of raster maps?
>    * 5 Q: How to animate a series of maps, including decorations?
>    * 6 Examples
>          o 6.1 Animate on screen
>          o 6.2 Animate to files
>          o 6.3 Encode as animated GIF
>          o 6.4 Encode as animated PNG (MNG)
>          o 6.5 Encode as FLI
>          o 6.6 Encode as MPEG-4 Xvid
>> By the  way, have anyone got the information on how to use
>> d.slide.show? The explanation in the GRASS help is not really helpful.
> d.mon x0
> d.slide.show prefix=elev
>Problem -- mencoder doesn't like PPMs created with the GRASS PNG driver:
>$ file ganim_001.ppm
>ganim_001.ppm: Netpbm PPM "rawbits" image data
>$ ls -l ganim_*.ppm | wc -l
>$ mencoder "mf://ganim_*.ppm" -mf "type=ppm:fps=5" -o ganim2.avi \
>   -ovc xvid -xvidencopts bitrate=1024
>MEncoder 1.0pre8-3.3.5 (C) 2000-2006 MPlayer Team
>success: format: 16  data: 0x0 - 0x0
>[mf] search expr: ganim_*.ppm
>[mf] number of files: 22 (88)
>[demux_mf] unknown input file type.
>============ Sorry, this file format is not recognized/supported =============
>=== If this file is an AVI, ASF or MPEG stream, please contact the author! ===
>Cannot open demuxer.
>Using PNG files work fine (see wiki example).
>grassuser mailing list
>grassuser at grass.itc.it
Gerald Nelson
Professor, Dept. of Agricultural and Consumer Economics
University of Illinois, Urbana-Champaign
office: 217-333-6465 
cell: 217-390-7888
315 Mumford Hall
1301 W. Gregory
Urbana, IL 61801

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