[vtkusers] Who can help me about NURBS

[feng_1999 at eyou.com]

dear everybody,
I know vtk can do the job of surface reconstruction from unorganized point
well.
But now,I want to use NURBS method to approximate the scattered points(about
1000) as smooth surface.How can I do.
The formulation confused me.Suppose I have scattered points which do not
satisfiy the matrix condition.How to do the parametrisation job to get the u,v
vector and the control points?Is there anybody who can help me?I'll provide
detail information about my question.Your kind help will be valuable for
me.Thanks!

feng

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>Today's Topics:
>
>   1. Volume viewing (Cristian Montagnoli)
>   2. deriving my own class from vtkActor (Steffen Oeltze)
>
>--__--__--
>
>Message: 1
>From: "Cristian Montagnoli" <cmontag at terra.com.br>
>To: <vtkusers at public.kitware.com>
>Date: Sat, 19 Oct 2002 10:56:59 -0300
>Subject: [vtkusers] Volume viewing
>
>Hi vtkusers,
>
>Is there a some way to read a volume and view each
>voxel like a cube (with alpha and color) ?
>
>I ask such kind of thing because my data sets are 
>extremely small and the composite functions do not
>give me the cube like bevahior.
>
>Thanks in advance,
>
>Cristian Montagnoli.
>
>
>--__--__--
>
>Message: 2
>Date: Sat, 19 Oct 2002 18:05:08 +0200
>From: Steffen Oeltze <Steffen.Oeltze at Student.Uni-Magdeburg.DE>
>To: VTK users <vtkusers at public.kitware.com>
>Subject: [vtkusers] deriving my own class from vtkActor
>
>Dear VTK-users,
>
>I have derived my own class from vtkActor and I have added a couple of 
>methods to this new class.
>After creating and modifying such a new actor I add it to my existing 
>renderer. At some point I use
>vtkRenderer->GetActors() to retrieve my custom actors. Then, I would 
>like to traverse the returned
>list and apply a custom method to each of my selfmade actors. However, I 
>get the error:
>
>> 'method' : is not an element of 'vtkActor'
>
>I guess this is a problem of backward compatibility but I don't know how 
>to solve it. Can anybody help me ?
>
>Steffen
>
>
>
>
>--__--__--
>
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