[vtkusers] vtkDataObject vs. vtkPointSet

[Amy Squillacote]

At 04:27 PM 11/29/2005, David Lee Lambert wrote:
>On Tuesday 22 November 2005 04:28 pm, Mathieu Malaterre wrote:
> > > demo2.cpp: In function 'int main(int, char**)':
> > > demo2.cpp:73: error: invalid conversion from 'vtkDataObject*' to
> > > 'vtkPointSet*'
> > >
> > > What might I doing wrong?
> >
> > When all else fail, read the instructions:
>...
> >
>http://www.vtk.org/Wiki/VTK_FAQ#The_C.2B.2B_compiler_cannot_convert_some_pointer_type_to_another_pointer_type_in_my_little_program 
>
>
>I head read that,  but I don't see how that could be the problem.  The
>offending line of my code is:
>
>    vtkPointSet *point_set = vtkPointSet::New();
>
>The version of vtk I'm using is 4.4.2,  and I noticed that vtkPointSet has no
>New() member function,  unless I misunderstand  the macros used in the
>headers;  could the problem be that New() is being inappropriately inherited
>from the superclass?

vtkPointSet should not have a New() method.  It is the abstract 
superclass of vtkPolyData, vtkStructuredGrid, and 
vtkUnstructuredGrid.  The New() method is valid for any of these 3 
subclasses.  Try creating a vtkPolyData instead of a 
vtkPointSet.  Also, if you're trying to render this data, you'll need 
to create a vertex cell for each point in your vtkPolyData.  You'll 
also need #include "vtkPolyData.h" in your source code where you're 
creating this vtkPolyData.

- Amy

>--
>DLL
>
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