Re: Funny results with transparency

Michael-

The problem is one of sorting the polygons which Java 3D does not do.
An explanation of sorts can be found in the visad list archives at:

http://my.unidata.ucar.edu/cgi-bin/getfile?file=/content/support/help/MailArchives/visad-list/msg01465.html

Don

Michael Raines wrote:

> Hi
> I have a very simple data set, just a squashed sphere. When I turn on 
> transparency I see a patchwork of differing intensities, either 1x or 2x 
> apparrently.
> Looks ok with it opaque. With transparency on I am expecting to see just 
> a transparent squashed sphere.
> When I cull back faces in VisAD (by modifying VisAD) I loose quite a few 
> faces altogether.
> Just guessing here ...
> So maybe the triangulation is yielding reversed face normals? But why 
> would that cause a problem with transparency ?
> Maybe I am getting both front and back faces superimposed in some places 
> ... hence the 2x.
> Help ?
> Thanks, Michael

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Don Murray                               UCAR Unidata Program
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(303) 497-8628                              Boulder, CO 80307
http://www.unidata.ucar.edu/staff/donm
"There's someone in my head, but it's not me"    Roger Waters
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