[GRASSLIST:9099] Re: 3D blocks again

[Ing.Peter Misovic]

Hallo Hamish

On 11/16/05, Hamish <hamish_nospam at yahoo.com> wrote:
> > We got the answer with hint that only hacking NVIZ code is the right
> > possible way how to add new symbol INTO NVIZ tool.
> ..
> > Where are the symbols from NVIZ ? In Mesa ?
>
> They are mostly in lib/ogsf/gsd_objs.c. I have just added cube and
> wire-frame box objects in 6.1-cvs.
>
> If anyone wants to add more they are made by OpenGL calls, but it is
> pretty simple to copy an existing one and modify the copy.
> Edit visualization/nviz/scripts/panel_site.tcl to add to the menu.
>
> I also activated a 3D asterisk and gyroscope that were already defined
> in the ogsf libs.

great

> (see attached image)
>
>
> > In short : we compute some geostat. parameters for mining production.
> > We split main mining unit into small minining units (500 000) - blocks
> > (based on geostat computing). As I have already written, for every
> > block X,Y,Z as coordinates of centroid are available; width, length
> > and height are known. We only need generate those boxes and display
> > them in 3D. Our main task is find - HOW TO - store them like 3D
> > objects in PostGIS and import into GRASS - no way (as I know, but I
> > hope I'm mistaken) ? etc etc ...GML ? I have no answer from GDAL forum
> > for my question : Doeas gdal suport 3D GML objects ? etc. etc.
>
> Note the above NVIZ icons will probably not be of a known calibrated
> scale and you will need to adjust until it looks right.

Yes, OK.

> If you want the boxes to be exactly the correct size (e.g. to use with
> 3d rasters), you will have to follow the example Jachym posted for
> defining 3D 'faces' using v.in.ascii.

Yes that's what I want to test as first :)

> The vector ascii format is described here:
> http://freegis.org/cgi-bin/viewcvs.cgi/~checkout~/grass6/doc/vector/vector.html#ascii
>
> If you want the vector points' boxes to be semi-transparent, you will
> have to learn a little OpenGL and edit gsd_objs.c by hand.

OK.

>
>
> Hamish
>


Thank you Hamish and Jachym, first of all I'm going to combine hints
of you both. Nice day.

Peter



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