[vtkusers] Computational Geometry - user equations?

[Andrew Maclean]

If I understand you correctly, then the approach described in
http://www.vtk.org/img/ParametricSurfaces.pdf in " How to create your own
surface" should work for you. If you adopt this approach, you just build
using the library and you do not need to modify the VTK library.

I attach  a VTK 6.3+ version of the example for you to try out.

I'll add this to the VTK examples sometime next week.

Once you get a surface you might like to look at:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/ElevationBandsWithGlyphs
and
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/CurvatureBandsWithGlyphs
for some visualisation ideas.


Regards
   Andrew



> ---------- Forwarded message ----------
> From: Cory Quammen <cory.quammen at kitware.com>
> To: piers.barber at logicmonkey.co.uk
> Cc: "vtkusers at vtk.org" <vtkusers at vtk.org>
> Date: Wed, 30 Sep 2015 09:15:45 -0400
> Subject: Re: [vtkusers] Computational Geometry - user equations?
> On Tue, Sep 29, 2015 at 12:13 PM, <piers.barber at logicmonkey.co.uk> wrote:
>
>> Hi All,
>>
>> I'd like to specify a surface f(u,v) in 3D with my own parametric
>> equation system {x(u,v), y(u,v), z(u,v)}. And then visualize it.
>>
>> The only way I can see to do this is to add my function to the library
>> source code, build the library and then call my function as described here:
>>
>>
>> http://www.vtk.org/Wiki/VTK/Examples/Cxx/GeometricObjects/ParametricObjectsDemo#CMakeLists.txt
>
>
> Yep, that looks like a good way to go.
>
>
>> I'm using vtkParametricTorus[.h, .cxx] as a template, but is there an
>> easier and more direct way to do this?
>>
>
> You can define your subclass of vtkParametricFunction in your local
> project - no need to add it to VTK, which is what I think you were saying
> above.
>
> Were you looking for a vtkParametricFunction subclass that takes an
> expression for x(u,v), etc.? That doesn't exist as far as I know, but that
> would be cool to have.
>
> Cory
>
>
>> Thanks!
>>
>> -=:LM:=-
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>
>
>
> --
> Cory Quammen
> R&D Engineer
> Kitware, Inc.
>
>
> --
___________________________________________
Andrew J. P. Maclean

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