[x3d-public] [x3dom-developers] Nurbs for x3dom

[Don Brutzman]

On 9/7/2018 7:44 AM, Andreas Plesch wrote:
> Thanks for the pointer. I took a look but it is unclear if it is
> possible to generalize this 2d method by Santina to 3d surface
> patches. Also it seems to rely on reducing order to quadratic which
> may often not be possible/desirable.

sure... no special significance implied, it was just that the paper explaining this interesting example wasn't immediately evident.

> jgeom seems unrelated to GP. It does look like a good method structure
> for construction of the various X3D Nurb nodes. Does it attempt to
> optimize animation in some way, eg. changes to control points/weights
> ?

we didn't get too far... it was an interesting library for NURBS that appeared to be in danger of getting lost, and we thought it would help various X3D/Xj3D efforts.  since then we've gotten super busy building out CAD capabilities for X3D.

good luck getting improvements for NURBS support.  implementations have had varied quality, it would be super to have first-class NURBS capabilities available in X3D.

> On Fri, Sep 7, 2018 at 7:39 AM Don Brutzman <brutzman at nps.edu> wrote:
>>
>> On 9/6/2018 12:44 PM, Joseph D Williams wrote:
>>> https://www.shadertoy.com/view/XtXfWn
>>>
>>> NURBS Rendering
>>>
>>> Thanks,
>>>
>>> Joe
>>
>> described at
>>
>>          http://jogamp.org/doc/gpunurbs2011/p70-santina.pdf
>>
>> about 5-6 years ago, Vince Marchetti and I worked a bit on jgeom library.  interesting resource, glad we archived it there so that it wasn't lost.
>>
>>          https://sourceforge.net/projects/jgeom
>>
>> you can find email about those efforts in email archives for "source at web3d.org" mailing list



all the best, Don
-- 
Don Brutzman  Naval Postgraduate School, Code USW/Br       brutzman at nps.edu
Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA   +1.831.656.2149
X3D graphics, virtual worlds, navy robotics http://faculty.nps.edu/brutzman