A source code for generating 3D beta-spline geometries based on the algorithm
for computing m-segment curves which is described on page 45 of Barsky's
"Computer Graphics and Geometric Modeling Using Beta-splines" can be seen at:
http://primordial.cic.unb.br/betasplines
In respect to the Java3D community and in the hope that someone interested in
this subject can get a little help from these lines, the author reminds that
although the program seems to be correct, a casual miscodification may be found
in it. In this case, comments and suggestions are welcome.
Aluizio Arcela
Universidade de Brasilia
Daniel Selman wrote:
> Kapil,
>
> There is no built in support for Splines in Java 3D. You will have to create
> a LineArray that joins your control points manually. There is however a
> spline Interpolator:
>
> com.sun.j3d.utils.behaviors.interpolators.RotPosScaleTCBSplinePathInterpolat
> or
>
> You could either cannibalize the source to this (available, as it is in the
> utils package) or "drive" the Interpolator to output your 3D points for your
> spline (by reading the Transform3D the Interpolator is modifying).
>
> If you use ByRef geometry the performance should be good enough that the
> users would be able to dynamically edit the spline.
>
> Boolean operations: Much harder and Java 3D won't provide much help here.
> Your going to need a good 3D geometry book!
>
> Picking points: There is a sample on www.j3d.org that does this.
>
> Sincerely,
>
> Daniel Selman
>
> -----Original Message-----
> From: Discussion list for Java 3D API
> [mailto:[EMAIL PROTECTED]]On Behalf Of Kapil Joshi
> Sent: Thursday, December 28, 2000 9:56 PM
> To: [EMAIL PROTECTED]
> Subject: Pick/Boolean/Splines Difficulties
> Importance: High
>
> Hi !
>
> I am trying to develop CAD software in java3d as my graduate
> level project. I need help from the java3d experts/practitioners on
> following points:
>
> 1) How to represent Splines in java3d?
> 2) How to provide Boolean operations?
> 3) How to Pick Points and Lines (they don�t enclose Area and j3d doesn
> �t pick them) ?
>
> These are some of the major difficulties I am facing.
>
> Please cud anyone help me out? Thank You.
>
> KJ
>
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