Anirban,
Have
you thought about separating the NURBS engine from the Graphics engine and
writing your own NURBS package?
You would then have full control over the NURBS implementation, and
would be able to draw NURBS curves/surfaces on any context (awt, 2D, 3D)
without having to access the OGL.
The
development time may be more costly, but I’m sure there are many people out
there who would be keen to get their hands on a good
package.
There
is a good book: [‘The NURBS Book’, Les Pegl & Wayne Tiller,
ISBN3-540-61545-8, Springer ] which contains a very good detailed description
of NURBS. It covers the maths
behind NURBS and a number of operations (knot insertion/refinement, degree
elevation, curve fitting etc), and contains pseudo code detailing some of the
most popular NURBS algorithms.
Regards,
Andy
Phelps
freecom.net consulting
ltd
================
Anirban,
I
would write my own Java classes to decompose a NURB into a triangle
strip
which
could then be part of a scenegraph. There is some sample code to
do
this
in one of the Graphics Gems books that you could covert to
Java.
Could
be a fun project...
Daniel Selman
[EMAIL PROTECTED]
Tornado Labs Ltd.
http://www.tornadolabs.com
[Daniel Selman]
-----Original Message-----
From:
Discussion list for Java 3D API
[mailto:[EMAIL PROTECTED]]On Behalf Of
Anirban Bhadore
Sent:
Friday, June 16, 2000 5:55 AM
To:
[EMAIL PROTECTED]
Subject: NURBS rendering in
Java3D
Hi All,
Presently Java3D does not support
NURBS surfaces as geometry. I want to
handle NURBS surfaces in a Java3D Viewer, how do I
handle picking and other
stuff
( which are supported by Java3D on facets )?
What I tried was writing a class of my
own extended from
javax.media.j3d.Canvas3D and overloaded the
postRender() where I call my JNI
which
in turn makes call to OpenGL Platform Libs. And I am able to
render
the
NURBS surfaces separately by my own JNI and the surfaces are
properly
rendered to the Java3D Canvas. But These NURBS
surfaces ARE NOT part of the
Java3D Scene Graph. And that's why normal Java3D
features are not supported
on
these surfaces. It seems difficult( if not impossible) to add them to
the
Java3D Scene Graph.
Does anybody have any experience in
this? Any suggestion will be
appreciated.
with
thanks,
Anirban
