[GRASSLIST:7427] Re: [GRASS5] Voxels/3D rasters in GRASS 6.1

[Markus Neteler]

On Sat, Jul 02, 2005 at 09:16:47PM -0700, Michael Barton wrote:
> Benjamin,
> 
> I got 3-D points to display in NVIZ pretty readily. I was testing this out
> several months ago. I suppose that it still works OK, but haven't tested it
> lately. The thing that tripped me up for awhile was the fact that my z-scale
> (total range of a couple meters) was much less than my xy scale (range of a
> couple hundred meters). I had to greatly increase the z exaggeration to see
> the 3D points.
> 
> For voxels, I had more trouble. I got the Slovakia dataset to work well
> once, but not a second time. 

Be sure to get the latest version (27-Apr-2005):

 http://mpa.itc.it/grasstutor/data_menu2nd.phtml
 -> slovakia3d.tar.gz, Slovakia 3D precipitation data set 

> However, this was several months ago and it may
> work better now. Again, there are some tricks. In the case of voxels, you
> need to set the isosurfaces to values that actually show something. I did
> this by trial and error, but you should be able to do this more
> intelligently with some practice.

Just read the README :-)
 http://mpa.itc.it/grasstutor/data7/slovakia3d_readme.txt
 
 
> (Without checking) I think that all voxel commands are now under the r3.*
> designation. I don't know why the information you are seeking is missing,
> except to say that the true 3D functions are still relatively rough and
> experimental compared with the 2D/2.5D in GRASS (as they are in other GIS's
> if they are even present at all).

I have updated the " GRASS 5.3 modules porting status to 6.0" WIKI page:
 http://grass.gdf-hannover.de/twiki/bin/view/GRASS/ModulePortingList#Volume_modules

Markus