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<html><div style='background-color:'><DIV> <P>Hi, Bill:</P> <P>Thank you very much for your help.</P> <P>I tried the following in my class:</P> <P>DisplayRendererJ3D dr = (DisplayRendererJ3D)display.getDisplayRenderer();<BR>TransformGroup tg = dr.getTrans();<BR>tg.addChild(myTransformGroup);</P> <P>Because display.getDisplayRenderer() will only return DisplayRenderer, so I casted it to</P> <P>DisplayRendererJ3D. The class compiled well, but I got a runtime error: javax.media.j3d.RestrictedAccessException: Group: only a BranchGroup node may be added.</P> <P>I also tried the following:</P> <P> DisplayRendererJ3D dr = (DisplayRendererJ3D)display.getDisplayRenderer();<BR> BranchGroup bg = dr.getRoot();<BR> bg.addChild(myTransformGroup);</P> <P>I got the same runtime error.</P> <P>Please advise. Thanks a lot.</P> <P>Gaoming</P> <P><BR><BR><BR> </P></DIV> <DIV></DIV> <DIV></DIV>>From: Bill Hibbard <HIBBARD@xxxxxxxxxxxxxxxxx> <DIV></DIV>>To: gaoming fu <GAOMING_FU@xxxxxxxxxxx> <DIV></DIV>>CC: visad-list@xxxxxxxxxxxxx <DIV></DIV>>Subject: Re: Irregular2DSet and contour lines <DIV></DIV>>Date: Thu, 29 Nov 2001 06:15:02 -0600 <DIV></DIV>> <DIV></DIV>>Hi Gaoming, <DIV></DIV>> <DIV></DIV>> > 1. I used Irregular2DSet to draw the following data. <DIV></DIV>> > <DIV></DIV>> > 4.0f 3.2f 9.0f <DIV></DIV>> > 5.4f 4.0f 9.0f <DIV></DIV>> > 4.0f 5.3f 9.0f <DIV></DIV>> > 3.2f 4.0f 9.0f <DIV></DIV>> > 4.0f 2.0f 8.0f <DIV></DIV>> > 6.0f 3.0f 8.0f <DIV></DIV>> > 6.0f 4.0f 8.0f <DIV></DIV>> > 5.0f 5.0f 8.0f <DIV></DIV>> > 4.0f 6.0f 8.0f <DIV></DIV>> > 3.0f 6.0f 8.0f <DIV></DIV>> > 2.0f 5.0f 8.0f <DIV></DIV>> > 2.0f 4.0f 8.0f <DIV></DIV>> > 2.0f 4.0f 4.0f <DIV></DIV>> > 4.0f 2.0f 4.0f <DIV></DIV>> > 6.0f 3.0f 4.0f <DIV></DIV>> > 6.0f 4.0f 4.0f <DIV></DIV>> > 5.0f 5.0f 4.0f <DIV></DIV>> > 4.0f 6.0f 4.0f <DIV></DIV>> > 3.0f 6.0f 4.0f <DIV></DIV>> > 2.0f 5.0f 4.0f <DIV></DIV>> > <DIV></DIV>> > I can not see any points with z values of 4.0, i.e., there is no surface drawn between <DIV></DIV>> > points with z value of 4.0 and points with z values of 8.0 and 9.0. But all the points can <DIV></DIV>> > be seen in the point mode. Please note that points with z values of 4.0 have the same <DIV></DIV>> > x and y values as points with z values of 8.0. <DIV></DIV>> <DIV></DIV>>If you are constructing an Irregular2DSet, then you must be <DIV></DIV>>representing your data as a FlatField with a 2-D domain and <DIV></DIV>>MathType ((x, y) -> z). But if you have different z values <DIV></DIV>>(4.0 and 8.0) at the same (x, y) locations, then z is not a <DIV></DIV>>function of (x, y). If you are passing all your (x, y) locations <DIV></DIV>>to the Irregular2DSet constructor, some of them will be <DIV></DIV>>identical, which will cause trouble in the implicit call to <DIV></DIV>>the Delaunay constructor. <DIV></DIV>> <DIV></DIV>>Because z is not a function of (x, y) you probably shouldn't <DIV></DIV>>try to depict your data as a functional surface. You might <DIV></DIV>>partition your data, so that the points in each partition <DIV></DIV>>do define a function relation ((x, y) -> z), then depict <DIV></DIV>>your data as multiple surfaces, one for each partition. <DIV></DIV>> <DIV></DIV>> > 2. I want to draw 3D surface together with contour lines and the contour line should be <DIV></DIV>> > labeled with elevation. <DIV></DIV>> <DIV></DIV>>You can construct ScalarMaps of z to ZAxis and to IsoContour. <DIV></DIV>>However, 2-D contour labeling currently only works for <DIV></DIV>>GriddedSets, so you will need to resample to a grid to get <DIV></DIV>>labels. A high resolution grid will be the most faithful <DIV></DIV>>to your original data. <DIV></DIV>> <DIV></DIV>> > 3. Can I add my own TransformGroup (i.e., built from java3d,without <DIV></DIV>> > 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 <DIV></DIV>> > same Coordinate system? <DIV></DIV>> <DIV></DIV>>Yes. Try: <DIV></DIV>> <DIV></DIV>> DisplayRendererJ3D dr = display.getDisplayRenderer(); <DIV></DIV>> TransformGroup tg = dr.getTrans(); <DIV></DIV>> <DIV></DIV>>Now you can add your own TransformGroup under tg. Note <DIV></DIV>>that the Transform3D in tg is controlled by the VisAD <DIV></DIV>>ProjectionControl and mouse rotate, translate and zoom. <DIV></DIV>>If you want to add your TransformGroup above this, then <DIV></DIV>>add them to the BranchGroup: <DIV></DIV>> <DIV></DIV>> BranchGroup bg = dr.getRoot(); <DIV></DIV>> <DIV></DIV>>Good luck, <DIV></DIV>>Bill <DIV></DIV>>---------------------------------------------------------- <DIV></DIV>>Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI 53706 <DIV></DIV>>hibbard@xxxxxxxxxxxxxxxxx 608-263-4427 fax: 608-263-6738 <DIV></DIV>>http://www.ssec.wisc.edu/~billh/vis.html <DIV></DIV></div><br clear=all><hr>Get your FREE download of MSN Explorer at <a href='http://go.msn.com/bql/hmtag_itl_EN.asp'>http://explorer.msn.com</a><br></html>
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