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
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