create tetrahedral from a set of points using vtkDelaunay3D

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#1

Hi,

How do I create tetrahedral from a set of points using vtkDelaunay3D? This is what I have come up with so far.

vtkDelaunay3D* getDelaunayTets; // create instance of vtkDelaunay3D
vtkPoints* points;
points=vtkPoints::New(); // initialise points (online example - not clear from doc)
points->InsertNextPoint(0,0,1); // insert points (online example - not sure if points r added)
points->InsertNextPoint(0,0,0);
points->InsertNextPoint(0,1,0);
points->InsertNextPoint(1,0,0);
points->InsertNextPoint(0.5,0.5,0.5);
vtkUnstructuredGrid* Mesh; vtkIdType id; double x[3]; vtkIdList* holeTetras;
getDelaunayTets->InsertPoint(Mesh, points, id, x, holeTetras);

I get an initialisation error for holeTetras and I am not sure how to initialise holeTetras.

#2

First you need to create a point set, then set it at input to the Delaunay filter, execute the filter, then retrieve the unstructured grid output.

Read the VTK textbook and check out related VTK examples.

#3

Thank you the suggestions.
If I understand your steps correctly, I need to create points, pass the points to Delaunay and execute a function within Delaunay that returns the mesh.

I have had a look at the vtkDelaunay3D cxx example which reads in points from a file and uses the SetInputConnection function to pass outputs of a filter as input to another filter. What remains unclear to me is how to pass a vtkPointSet (or vtkPoint, used by me) to vtkDelaunay3D. Could you kindly help with this? My c++ skills are still under development. Thanks.

#4

It is shown in hundreds of examples how to set input connection or input data in a filter. There is even an example specifically for using Delaunay3D filter.

Please spend some time reading the freely available VTK textbook and VTK examples.

#5

Thank you for your responses; they are much appreciated.