Hi, Bill:
Thank you very much for your help.
I tried the following in my class:
DisplayRendererJ3D dr = (DisplayRendererJ3D)display.getDisplayRenderer();
TransformGroup tg = dr.getTrans();
tg.addChild(myTransformGroup);
Because display.getDisplayRenderer() will only return DisplayRenderer, so I casted it to
DisplayRendererJ3D. The class compiled well, but I got a runtime error: javax.media.j3d.RestrictedAccessException: Group: only a BranchGroup node may be added.
I also tried the following:
DisplayRendererJ3D dr = (DisplayRendererJ3D)display.getDisplayRenderer();
BranchGroup bg = dr.getRoot();
bg.addChild(myTransformGroup);
I got the same runtime error.
Please advise. Thanks a lot.
Gaoming
>From: Bill Hibbard
>To: gaoming fu
>CC: visad-list@xxxxxxxxxxxxx
>Subject: Re: Irregular2DSet and contour lines
>Date: Thu, 29 Nov 2001 06:15:02 -0600
>
>Hi Gaoming,
>
> > 1. I used Irregular2DSet to draw the following data.
> >
> > 4.0f 3.2f 9.0f
> > 5.4f 4.0f 9.0f
> > 4.0f 5.3f 9.0f
> > 3.2f 4.0f 9.0f
> > 4.0f 2.0f 8.0f
> > 6.0f 3.0f 8.0f
> > 6.0f 4.0f 8.0f
> > 5.0f 5.0f 8.0f
> > 4.0f 6.0f 8.0f
> > 3.0f 6.0f 8.0f
> > 2.0f 5.0f 8.0f
> > 2.0f 4.0f 8.0f
> > 2.0f 4.0f 4.0f
> > 4.0f 2.0f 4.0f
> > 6.0f 3.0f 4.0f
> > 6.0f 4.0f 4.0f
> > 5.0f 5.0f 4.0f
> > 4.0f 6.0f 4.0f
> > 3.0f 6.0f 4.0f
> > 2.0f 5.0f 4.0f
> >
> > I can not see any points with z values of 4.0, i.e., there is no surface drawn between
> > points with z value of 4.0 and points with z values of 8.0 and 9.0. But all the points can
> > be seen in the point mode. Please note that points with z values of 4.0 have the same
> > x and y values as points with z values of 8.0.
>
>If you are constructing an Irregular2DSet, then you must be
>representing your data as a FlatField with a 2-D domain and
>MathType ((x, y) -> z). But if you have different z values
>(4.0 and 8.0) at the same (x, y) locations, then z is not a
>function of (x, y). If you are passing all your (x, y) locations
>to the Irregular2DSet constructor, some of them will be
>identical, which will cause trouble in the implicit call to
>the Delaunay constructor.
>
>Because z is not a function of (x, y) you probably shouldn't
>try to depict your data as a functional surface. You might
>partition your data, so that the points in each partition
>do define a function relation ((x, y) -> z), then depict
>your data as multiple surfaces, one for each partition.
>
> > 2. I want to draw 3D surface together with contour lines and the contour line should be
> > labeled with elevation.
>
>You can construct ScalarMaps of z to ZAxis and to IsoContour.
>However, 2-D contour labeling currently only works for
>GriddedSets, so you will need to resample to a grid to get
>labels. A high resolution grid will be the most faithful
>to your original data.
>
> > 3. Can I add my own TransformGroup (i.e., built from java3d,without
> > using any VisAD) to DisplayImplJ3D in a class built using VisAD, and then draw it together with any other data processed using VisAD, in the
> > same Coordinate system?
>
>Yes. Try:
>
> DisplayRendererJ3D dr = display.getDisplayRenderer();
> TransformGroup tg = dr.getTrans();
>
>Now you can add your own TransformGroup under tg. Note
>that the Transform3D in tg is controlled by the VisAD
>ProjectionControl and mouse rotate, translate and zoom.
>If you want to add your TransformGroup above this, then
>add them to the BranchGroup:
>
> BranchGroup bg = dr.getRoot();
>
>Good luck,
>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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