[vtkusers] unstructured grid + tetrahedrons

[Jérôme]

Hi,
A vtkDatasetMapper is a generic mapper that, according to its name, maps
vtkDataSet. You will find that vtkImageData, vtkPolyData,
vtkUnstructuredGrid and a lot of other vtk data structures inherit from
vtkDataSet. Basically, it means that vtkDataSetMapper will 'see' a volume
(vtkImageData) like a mesh ('vtkPolyData') but also like a volumic mesh
('vtkUnstructuredGrid'). For instance, try to map a volume (mhd, dicom or
vti) through a DataSetMapper: you will render only the grid of the external
faces! (yes, try it, because I only assume that!).

By reading the doc, I saw that DataSetMapper has a vtkPolyDataMapper as
member. It makes me thinking that this mapper maps *everything* has it was a
polydata (*maybe* building explicit topology when it has to). And a polydata
has no 3D cells such as in vtkUnstructuredGrid. This *could* explain the
behaviour you described.

How can you see the tetrahedron? By using a vtkUnstructuredGripVolumeMapper,
but my knowledge stop here!

HTH
Jerome



2009/12/10 Baliki B. <balikivtk at gmail.com>

> Hi,
>
> i have an unstructured grid (a file) which contains tetrahedrons.
> I read the file with vtkUnstructuredGridReader.
> Then i use a vtkDataSetMapper but i  don't really get the tetrahedron but
> the boundary tringles.
>
> What am i doing wrong?
> How can i visualize it so that i can see the tetrahedrons?
>
> (Sorry if my questions are "stupid".)
>
>
>
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