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[dinaharchery]

Please Help,

I have been searching all over for a Java 3D API with NURBS implementation (specifically Surface trimming). Can anyone tell me if Xith3D has NURBS surface trimming implementation (such as OpenGL's GLU)? If so, can you direct me to a tutorial on this using Xith3D or some simple example code? If not, do you know of any Java 3D API with this feature?

Thank you for any help.

[Marvin Fröhlich]

Well, there is not built-in NURBS functionality in Xith3D. But it shouldn't be too difficult to add that, if you know/understand the formulas, that NURBS are defined on. I suggest to search Wikipedia for that (here is a german version. Didn't find the english one right now).

In principle you only have to compute the function value for each vertex of a grid shape.

I guess, it would be best to write a GLSL program and apply it to an org.xith3d.scenegraph.primitives.Grid.

Does this help?

Marvin

['n ddrylliog]

English version : http://en.wikipedia.org/wiki/Nonuniform_rational_B-spline

[dinaharchery]

Thanks everyone for the information. 

I was just hoping there was a NURBS surface trimming option somewhere for the Java API.  I have heard that implementing basic NURBS is no big issue however, surface trimming is another problem (a BIG problem). However, it looks as if I have no choice but to give it my best shot and see what I can do. If I come up with something I will definately post it because I believe this would be of great use to a lot of programmers of Java out there.

Thanks again.

[Marvin Fröhlich]

Hmm... I found this. Sounds indeed complicated. Good luck . And it would be great, if you would post your results here. I would happily integrate them into the xith utilities.

Marvin

[Marvin Fröhlich]

Hey, does this help?

Marvin

[dinaharchery]

Wow,

Thank you. I will check out the JOGL link and see if it is what I need.

Once again, thanks.