Thanks Chris - ShowBoundary was just what i needed to complete the
picture! As well, your other advice about invalid connections (this is a
nice tool that I could never get AVS to do) is greatly appreciated.
So, is there a "module repository" for those who write custom modules
and would like to contribute them to the cause?
cheers,
Karl
Chris Pelkie wrote:
Welcome to DX-land, then!
I think you are looking for ShowBoundary which puts a polygonal face on
a volumetric data set. You can fiddle with the opacity of the boundary
by adding a Color module afterward and only changing the opacity
(existing colors will be unaffected). Or add a Colormap, adjust the
opacity curve and hook up the rightmost output of Colormap to the
rightmost input of Color to drive the opacity by data.
To knock out blocks, create an "invalid connections" component. This can
be done either via Color/Colormap where Colormap excludes values outside
a range (automatically), or Include (also range-based), or by
algorithmically (Compute) generating an array of bytes (1=invalid true,
0=invalid false), one per connection element (voxel, here). Make this
array 'dep' 'connections' (use Options to add this attribute to your
array), then Replace it onto your field as the "invalid connections".
You may find, as I did long ago, that volume rendering in DX leaves much
to be desired. First and foremost to me, no perspective rendering (ugh).
So, to "see" interior voxels, use Isolate followed by ShowBoundary and
play with the Isolate value. In conjunction with the invalids, you
should be able to get some interesting pics.
On Monday, May 24, 2004, at 20:51 America/New_York, Karl Pohlmann wrote:
Hi,
I'm new to OpenDX (though I've got a long history with AVS 5) and
after going through all the tutorials and examples, I'm still having
trouble visualizing my data set. I've got model results on a regular
(finite difference) 3-D mesh and I'd like to visualize them as
"voxels", that is as connection-dependent so that values are
assigned to the entire cell, not to the vertices of the cell. In
fact, the data are cell-based cubes so they should look like solid
bricks in the visualization. Now, I've been able to generate
visualizations that are pretty much want I want with the exception
that the colors on the cell faces are not opaque. Therefore, when
the looking at the visualization, there is enough transparency that
one cannot discern the colors of cell faces closest to the viewer.
Any thoughts on how best to treat these data? I'd also like to cut
away at the mesh by removing bricks of a certain value (sort of like
isosurface, but without interpolation.
Thanks in advance,
Karl
Karl Pohlmann
Associate Research Hydrogeologist
Division of Hydrologic Sciences
Desert Research Institute
755 East Flamingo Road, Las Vegas, NV 89119
Phone: 702-862-5485 Fax: 702-862-5427
E-mail: [EMAIL PROTECTED]
http://www.dri.edu/People/karl/
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_______________________________
Chris Pelkie
Scientific Visualization Producer
622 Rhodes Hall, Cornell Theory Center
Ithaca, NY 14853
--
Karl Pohlmann
Associate Research Hydrogeologist
Division of Hydrologic Sciences
Desert Research Institute
755 East Flamingo Road, Las Vegas, NV 89119
Phone: 702-862-5485 Fax: 702-862-5427
E-mail: [EMAIL PROTECTED]
http://www.dri.edu/People/karl/
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