[vtkusers] Create a correct mesh from set of triangles and wrong vertices index numbers

[Cory Quammen]

On Fri, Dec 23, 2016 at 5:02 AM, gocarlos <gocarlos at ethz.ch> wrote:
> Dear VTK Users
>
> I have some data sets which have several triangles (set of 3 points with x,
> y, z) and vertices. (like the OBJ file).
> The problem is that the vertices are just in increasing order and not
> ordered.

I'm not sure what you mean by "are just in increasing order". Do you
mean that each triangle has a unique set of three vertices and the
vertices are listed in the order the cells are listed?

> Using PCL I've seen that when I save my PCL mesh (with unordered vertices)
> into STL, the PCL library converts the PCL mesh in VTK polydata and then a
> STL file is written to the file system (using VTK).
>
> I tried to look in the source code after the method which vtk used to clean
> the mesh to reorder the vertices, but I haven't found anything.

vtkCleanPolyData would be useful:
http://www.vtk.org/doc/nightly/html/classvtkCleanPolyData.html

> I'm only interested on how VTK orders the vertices in such a way, that they
> are in the right order and the points of the mesh are not duplicate.
> Is there a method to clean the mesh/connect the duplicate points/reorder the
> vertices index?

See this example that does what you want:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/CleanPolyData

- Cory

> Thanks in advance.
>
>
>
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-- 
Cory Quammen
Staff R&D Engineer
Kitware, Inc.