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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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To learn about what's going on, see About the Archive Site.
Hi Ken- Ken Mankoff wrote:
You could do this with a combination of the Volume Rendering control and an isosurface. Set the transparency on the volume rendering to be about 90%. You'll also need to use the View->To Front option for the Volume control to be able to see the embedded isosurface.OK I forget about Volume Rendering (FYI that string isn't even in the manual).
Oops, thanks for pointing that out. We'll add an entry. I've done that. By default, I cannot see through the top layer,
so I set the transparency of the colorbar. Example screenshot is here: http://edgcm.columbia.edu/~mankoff/IDV.pngBut there is a difference between this and the previous image. In the original image, transparency is a function of data value (in addition to color). What I've done in IDV has color as a function of value, but transparency is just applied to the whole data set uniformly.I chose 50% transparency in the above image. For this specific image it looks like since there are 4 layers that each layer is 12.5% opaque (87.5% transparent). The four layers therefore are 50% transparent as a total.Is there a different way to get transparency applied to the data set as a function of the data set? For example, looking at a rain cloud, I'd like to color the data based on moisture content, but have transparency based on particle density. This would give a somewhat realistic view, in that when there are more particles it gets harder to see through a cloud.
You currently can't interpolate the transparency like you can the colors, but it's a good suggestion. I'll add it to the list.
Also, on this image, I've added an isosurface, but I cannot see it through the 'transparent' volume layers.http://edgcm.columbia.edu/~mankoff/IDV.png
The "To Front" solved that as you noted in your other mail. Transparency is order dependent (unfortunately). Don ************************************************************* Don Murray UCAR Unidata Program dmurray@xxxxxxxxxxxxxxxx P.O. Box 3000 (303) 497-8628 Boulder, CO 80307 http://www.unidata.ucar.edu/staff/donm *************************************************************
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