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Re: Markus,<BR>
<BR>
Having created a DEM of the depths for the bottom surface and used the outline as the top again, r3.out.vtk now gives me a 3D model in Paraview which seems to represent the DEM surface (including extrapolated height values outwith the lake, which I can solve when I get the Mask to work properly). Selecting to view the model as a Volume throws up the error message:<BR>
<BR>
"Cannot volume render since no point (or cell) data available."<BR>
<BR>
Creating the file again in r3.out.vtk, but this time with some of the carbon data included as a G3D map, creates the same structure, which resembles voxel form. However, selecting to view it was a Volume starts a loading process which takes over 3 hours (I still haven't seen it finish yet!), with the message 'OpenGLProjectedTetrahedraMapper' at the bottom and a loading bar which goes from 0 to 100 then starts again on a loop.<BR>
<BR>
Using v.vol.rst with the carbon data, I used this command line:<BR>
<BR>
"v.vol.rst input=Seasonal_0411_DIC@PERMANENT wcolumn=dbl_3 elev=G3D_0411_DIC_2707"<BR>
<BR>
This produced the error message:<BR>
<BR>
"ERROR: Key column type is not integer"<BR>
<BR>
The info for the Carbon file is as follows:<BR>
<BR>
"v.info -c Seasonal_0411_DIC<BR>
INTEGER|cat<BR>
DOUBLE PRECISION|dbl_1<BR>
DOUBLE PRECISION|dbl_2<BR>
INTEGER|int_1<BR>
DOUBLE PRECISION|dbl_3<BR>
Displaying column types/names for database connection of layer 1:"<BR>
<BR>
The carbon data is contained within dbl_3, with dbl_1, dbl_2 and int_1 being the x/y/z coordinates.<BR>
<BR>
Re: Hamish - Thanks for the advice. I'll try those modules out today.<BR>
<BR>
Craig<BR> <br /><hr />Get a free e-mail account with Hotmail. <a href='http://clk.atdmt.com/UKM/go/197222280/direct/01/' target='_new'>Sign-up now.</a></body>
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