[GRASS-user] RE: Need help with volumes in NVIZ

[Suzanne]

Craig,

Your instructions gave me success.  I think my problem was not putting 
in a value that was recognized in the data.  I now can see isosurfaces.

Thanks!
Suzanne

On 11/11/2010 9:29 AM, Craig Wilson wrote:
> Suzanne,
>
> If you've got to the stage of importing the G3D (volume) file into 
> NVIZ, and if it has the variable (w) attribute running through the 
> volume, isosurfaces can be created by:
>
>     * Selecting 'Isosurfaces' from the 'Visualization type';
>     * Clicking 'Add' from the right-hand menu;
>     * Where it prompts you for a digit, enter a value of the variable
>       which is contained within the volume. For example, when I wanted
>       to highlight areas within Loch Lomond which had 0.15mM of
>       dissolved carbon, I entered 15 at this stage (I had multipled
>       all values by 100 at an earlier stage). As long as this number
>       was contained within the original data converted into the G3D
>       file (e.g. if a text file contains 4 columns of x, y, z and the
>       variable attribute, this attribute must be selected when the G3D
>       file is created - from what you said about getting the slices to
>       work, it sounds like this has already been done), the
>       interpolated boundary lines for 0.15mM throughout the lake were
>       then visualized with isosurfaces. In the screen grab below, I
>       performed this for 0.15mM and 0.20mM.
>
>
> _http://img222.imageshack.us/img222/8780/isosurfacesinnviz.jpg_
>
> It's been a few months since I used GRASS, so if those instructions 
> don't work I can go back and figure out precisely how it was done.
>
> Craig Wilson
>
>
> _______________________________________________
> grass-user mailing list
> grass-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/grass-user/attachments/20101111/9f0b22e9/attachment-0001.html