Re: partially buried contours

Hi Donna,

I did a couple experiments and found something you can do, but
its a bit of a hack. You can raise the contours away from the
surface, if you can decide on a fixed direction for them to be
raised. Say you decide to raise the contours by 0.02 in the
positive ZAxis direction. Ideally, you could construct a
ConstantMap of 0.02 to ZAxisOffset and include it in the call
to DisplayImpl.addReference(). However, the system doesn't
seem to pick up the ConstantMap to ZAxisOffset. So instead,
replace your ScalarMap to ZAxis with an identical ScalarMap
to ZAxisOffset, and use a ConstantMap to ZAxis in place of
the ConstantMap to ZAxisOffset. Ugly, but it worked in a test
I ran.

Note that for 2-D displays, the system adds an implicit offset
to raise line graphics above images and trianlges.

Good luck,

On Tue, 7 Jan 2003, Donna L Gresh wrote:

> I am adding IsoContours over a surface in three-space (an analog to
> discussion in tutorial 3.7 of "IsoContours over image") and find that the
> contours are partially "buried' in the surface. It is more or less obvious
> depending on viewing angle. In my days of using Data Explorer there was a
> way to add "fuzz" to the contours to allow them to "float" a bit above the
> background object. Is there something equivalent in VisAD? Apologies if
> it's documented and I just didn't see it; I did look in the javadoc and the
> discussion.
> Here's a picture to show what I mean:
> (See attached file: buriedcontours.jpg)
> Donna L. Gresh, Ph.D.
> IBM T.J. Watson Research Center
> (914) 945-2472
> gresh@xxxxxxxxxx

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