[GRASS-windows] Re: 3D model and visualization (Audrey Pignon)

["Peter Löwe"]

Audrey,

maybe you could try the old fashioned approach to go via raster layers. This at least gives you a bit more control about the successive processing steps and might help to identofy your errors:

[Assuming that there are defined steps of Z(depth)]

1) Import xy data layers for each level of Z to a point vector layer (v.in.ascii "times Z")
2) Convert each point vector laver to a a raster layer (v.to.rast, previous interpolation steps may be required)
3) Stack the raster layers with r.to.rast3 to a volume [don't forget to set the regions depth/height accordingly]
4) Visualize this volume in NVIZ
4a) Export it to Paraview using r3.out.ovl. (and visualize it there)

Alternatively, you could just try v.out.ovl using your current vector data.


Hope this helps,
Peter

> Hey,
> I would like to create a 3D voxel model on GRASS of the resistivities in
> the
> ground. My xyz file is componed by:
> x  y  z  rho
> At the moment, I have imported the file but I can not view the 3D vector
> point file with the NVIZ tool...when I want to visualize it, nothing
> appears
> although I can see it in the map display in 2D..
> When I try to interpolate these points with v.vol.rst, it says to me that
> there are points outside specified 2d 3d region and that it is too long to
> find points for interpolation and so I should change the region to area
> where my points are...
> Everybody has an idea?
> 
> thanks
> 
> If somebody have a proceeding for creation of a3D model from an ASCII
> point
> file with x,y,z,w, I should be very pleased to study it!
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-- 
Dr. Peter Löwe
<peter.loewe at gmx.de>





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