[GRASSLIST:9079] Re: 3D blocks again

[Ing.Peter Misovic]

Maybe some description in English could better illustrate what we are
doing in fact.


In some Slovak miming production they're planning open new mining unit
(part of mine planned to be mined out) - block. Our team provide some
geostatistical computing. In regard of results of this computing the
main mining unit (proportions around 1000mx1000mx500m) will be
splitted into micro minining (proportions based on computing ranges)
units with 84 computed parameters. In that range (f.e) 500 000 micro
units (blocks) will be available. In fact we will have coordinates of
centroid (centre), width, height and length of every micro unit  + 84
computed parameters available.

What do we have to do with this data ? To visualize them like boxes
with specific colour. My concept were based on PostGIS database. To
have 3d boxes in PostGIS (+ attribute table in postgress based table
and joined view for manipulating) and import them into GRASS/NVIZ and
colorize by some atrribute. For our project doesn't matter how block
could be displayed in GRASS/NVIZ - either like raster or like vector.

Thank you all,


Peter Misovic



On 11/15/05, Ing.Peter Misovic <peter.misovic at gmail.com> wrote:
> Hallo Hamish,
> yes it is repeating stuff because of it's still open. I know that you
> have already written about modification of panlel_site.tcl (there is
> code only for providing new checkbox and change_marker method calling)
> and tweaking of existing symbol. But as I have already written in
> [GRASSLIST:8933] editing exising sybol took no effect at all (for
> example - BOX). Why ? Because it is source of 2D symbols (for GRASS
> GIS manager). Diamond, Sphere and X have no conenction to symbols in
> $GISBASE/etc/symbols. We tried to add existing symbol BOX (from
> $GISBASE/etc/symbols) but with no effect. We got the answer with hint
> that only hacking NVIZ code is the right possible way how to add new
> symbol INTO NVIZ tool. Is it more clear now ? NVIZ has no connection
> to $GISBASE/etc/symbols. Where are the symbols from NVIZ ? In Mesa ? I
> don't know I'm not programmer in language of NVIZ. And actually there
> is no time to hack code to provide new symbol for NVIZ by this way.
> Therefore I'm (and me friend Peter) trying to find new solutions by
> several directions. One of existing possible ways is to use GML or
> PovRay. Or like Jachym wrote - ASCI as he illustrated. Or ...I don't
> know yet.
>
> That't the reason, why we're repeating our problem. We're developing
> Mining system based on OpenSource GIS tools (Mapserver, Grass, Postgis
> etc.). We planned to use GRASS for 3D visualization. But we are in
> troubles now. Any help , any good or bad possibility we can try to
> apply in our system and it could affort final concept for our system.
>
> 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.
>
> You know, our main work is computing geostat. variables, we thought
> build GIS for visualization should not be complicated ...but we are in
> troubles now :(
>
>
> Peter
>
>
>
> On 11/15/05, Hamish <hamish_nospam at yahoo.com> wrote:
> > > In fact I have 3D matrix of points. Nature of data source is table in
> > > postgres/Postgis with columns : x, y, z, the_geom (for 3d point) etc.
> > > X,Y,Z are coordinates of centroid. I need display those centriods like
> > > cubes (or it's better to say cuboids, blocks, not cube) with specific
> > > colour.
> >
> >
> > Hi,
> > D
> > This is repeating stuff we have already said, but I think the easiest
> > way to do this given cube centroids is to extend the NVIZ point-shapes
> > to include cubes along with the existing sphere, diamond, and "X". You
> > should be able to cut and paste one of the others (ie diamond) then
> > rename and tweak it. I can't help you with the exact code you need to
> > change, maybe someone else knows. But I think that is the easiest way.
> >
> >
> > Hamish
> >
>