[GRASSLIST:846] v.extrude and nviz

GRASS GRASS user
1

Hi all,

I have a set of building footprints that I want to visualise as 3d objects in NVIZ using heights stored in an attribute.
I import the shapefile, use v.extrude to create a 3d building and visualize them in NVIZ.
Small building (with few vertices) are ok, but more complex footprints go wrong (see attached jpegs for the footprint and the result in nviz.
Is there a limitation in v.extrude/NVIZ concering the number of vertices ?
Topology was built with v.support and the areas show ok in grass.

Any ideas?

Thanks,

-Jeroen.

(attachments)

/mnt/iedereen/gis/building1.jpg
/mnt/iedereen/gis/building2.jpg

2

I have got the same problems!!!!
with simple features (rectangular areas for example) v.extrude is
perfect!! but when there are more complex geometries.. there seems to
create strange "roofs"...

is this a little bug???
thanks

Ivan

Il giorno lun, 24/04/2006 alle 16.10 +0200, Js Wortel ha scritto:

Hi all,

I have a set of building footprints that I want to visualise as 3d objects in NVIZ using heights stored in an attribute.
I import the shapefile, use v.extrude to create a 3d building and visualize them in NVIZ.
Small building (with few vertices) are ok, but more complex footprints go wrong (see attached jpegs for the footprint and the result in nviz.
Is there a limitation in v.extrude/NVIZ concering the number of vertices ?
Topology was built with v.support and the areas show ok in grass.

Any ideas?

Thanks,

-Jeroen.

--
Ivan Marchesini
Department of Civil and Environmental Engineering
University of Perugia
Via G. Duranti 93/a
06125
Perugia (Italy)
e-mail: marchesini@unipg.it
        ivan.marchesini@gmail.com
tel: +39(0)755853760
fax: +39(0)755853756
jabber: geoivan73@jabber.org

3

Hallo,

when I wrote v.extrude, I had the same problem. I thing, it is problem
of nviz. When you try to visualize your building in e.g. Paraview
(v.out.vtk) - it looks all right.

Jachym

On Mon, Apr 24, 2006 at 04:10:32PM +0200, Js Wortel wrote:

Hi all,

I have a set of building footprints that I want to visualise as 3d objects in NVIZ using heights stored in an attribute.
I import the shapefile, use v.extrude to create a 3d building and visualize them in NVIZ.
Small building (with few vertices) are ok, but more complex footprints go wrong (see attached jpegs for the footprint and the result in nviz.
Is there a limitation in v.extrude/NVIZ concering the number of vertices ?
Topology was built with v.support and the areas show ok in grass.

Any ideas?

Thanks,

-Jeroen.

--
Jachym Cepicky
e-mail: jachym.cepicky@centrum.cz
URL: http://les-ejk.cz
GPG: http://les-ejk.cz/gnupg_public_key/jachym_cepicky-gpg_public_key.asc
-----------------------------------------
OFFICE:
GDF-Hannover
Mengendamm 16d
30177 Hannover
Germany
e-mail: cepicky@gdf-hannover.de
URL: http://gdf-hannover.de
Tel.: +49 511-39088507