[vtkusers] Displaying NURBS surfaces in VTK

[Marius Erdt]

Thanks for the reply,

in my case using external tools for displaying NURBS is not an option, 
because my visualization framework is based on VTK. In addition I have 
to modify the NURBS surface during runtime (move control points), so I 
can't switch to an external modeler for that.

I was wondering whether it is possible to calculate the NURBS surface 
from the control points and store that information somehow in a VTK data 
structure to display it at runtime. My question would also be how fast 
that procedure can be performed.

Regards,
Marius

David, John wrote:
> Since no one else has answered, I'll give it a try...
>
> I consider myself a VTK NooB, and too have an interest in using NURBS with VTK.  After hunting around for quite awhile the positive feedback I came across was a suggestion on using OpenNURBS for the surface/spline part, and VTK for the visualization etc.  Taking a look at OpenNURBS and OpenCAM it appears that the GLU problem was solved some time ago (not -- I have not made an in depth study to make sure).
>
> If you just want to render NURB surfaces, I would suggest taking a look a Blender available at blender.org, Rhino, or similar animation packages.  There are also a number of simulation tools like OpenCASCADE which might work too (again I am not sure of the capabilities).
>
> Other than that I think the whole NURBS question would make for a wonderful addition to the FAQ, but when I went to check the VTK FAQ I got a 404 error...  Maybe I'll have better luck later today.
>
> Best of luck, and when you find a solution, will you tell mee ;-)
>
>
>   EBo --
>
> -----Original Message-----
> From: vtkusers-bounces at vtk.org on behalf of Marius Erdt
> Sent: Wed 4/2/2008 3:27 AM
> To: vtkusers at vtk.org
> Subject: [vtkusers] Displaying NURBS surfaces in VTK
>  
> Hello everybody,
>
> I need to display a NURBS-surface in my application which uses VTK for
> visualization.
> There have been a couple of posts on this list regarding NURBS support
> in VTK from late 2004 saying it is not possible due to the lack of GLU
> integration.
>
> Does anybody know if there have been any changes in VTK that enable
> displaying of NURBS surfaces? And if it is still not possible to
> directly view such surfaces, is there any opportunity to make a
> workaround? What I have right now are the control points of the surface
> to be rendered.
>
> Thanks for any help,
>
> Marius
>
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