Re: Fw: FlatField display questions, and more...

• To: Cameron Sanders <csanders@xxxxxxxxxxx>
• Subject: Re: Fw: FlatField display questions, and more...
• From: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx>
• Date: Wed, 23 Feb 2000 07:43:53 -0600

Hi Cam,

For some reason, netscape won't quote your email in this
reply, so I'll just refer to you questions by number.

Question 1. This sounds like a Java3D bug that I have
encountered before, when NX, NY and NZ are not all equal.
To comment more I'd have to reproduce the bug, but I
wasn't able to compile your attached program because of
the "import imago.model".

Questions 2, 3 and 4.  These can all be addressed by
changing your data.  Currently, you have many FlatFields
with MathTypes ((x, y, z) -> NAME_density).  Then you
map the various NAME_density RealTypes to color components.
VisAD depicts each FlatField with a different set of
colored polygons.  So rather than the colors being blended,
the polygons fight in the Z-buffer givng all sorts of weird
effects.  Try combining all you FlatFields into one
FlatField with MathType:

  ((x, y, z) -> (NAME1_density, ..., NAMEn_density))

and then mapping the various NAME_density RealTypes to
color components.  The colors should be merged.

Question 5. To add your own branch to VisAD's Java3D
scene graph, try this:

  DisplayRendererJ3D dr
    (DisplayRendererJ3D) display.getDisplayRenderer();
  TransformGroup trans = dr.getTrans();

Then you can add a Java3D BranchGroup to trans (only a
BranchGroup, since trans is live).

Note that by using mappings to Display.Shape, or by using
various VisAD MathTypes, your can create a wide variety of
discrete geometries within VisAD.

Cheers,
Bill
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI  53706
hibbard@xxxxxxxxxxxxxxxxx  608-263-4427  fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html

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