RE: fun with spheres...


Hi Bill (and the rest of VisAD universe),

I was able to fix one issue, I was mapping (index -> shape scale) and, go
figure, my spheres were increasing in size over the 50k or samples in my
data set...  oops.

But the sphere/facet issue is still unresolved.  I have tested my geometry
w/ a base line Java 3d setup and everything looks as desired...  Could the
problem be my use of radial normals (based on the vertices) as opposed to
polygon/face normals?

Thanks much,

Tom

>
>
> Hi Tom,
>
> > I'm attempting to render points as spheres.  But i'm having problems w/
> > rendering in POLYGON_FILL mode w/i visad.   My intention is to
> have multiple
> > solid, shaded spheres displayed of consistent size, but I get
> spotty fill
> > with inconsistent size...  Since a picture is worth a thousand
> words i'll
> > put links to pictures which best describe my situation.  The
> second pic. is
> > of the first zoomed into a sphere (which includes a shaded
> come...???)  What
> > am I missing?
>
> My best guess is that there is some problem with your
> normals, or even errors in your geometry. The attached
> jar file includes a Python program dna.py and a data
> file dna_molecule.txt read by the program. This
> program draws atoms as octahedra (poor man's spheres)
> with no problem. Also, VisAD draws vary complex shapes
> including spehres as iso-surfaces without problem.
>
> Good luck,
> Bill
>