[vtkusers] How to pass a triangle without its point set?

[Bill Lorensen]

David,
I'll take a look.

Bill

On Sat, Oct 31, 2009 at 8:27 AM, David Doria <daviddoria+vtk at gmail.com> wrote:
> On Sat, Oct 24, 2009 at 12:47 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>> vtkTriangle is a vtkCell. It only has 3 points and 3 point ids. The
>> points and ids are created as construction. In your original example,
>> how would expect triangle to know about the points you created.
>>
>> SetPoint and InsertPoint have different semantics. In this case,
>> SetPoint is better, since range checking is not required.
>>
>> From the vtkPoints.h
>>  // Description:
>>  // Insert point into object. No range checking performed (fast!).
>>  // Make sure you use SetNumberOfPoints() to allocate memory prior
>>  // to using SetPoint().
>>  void SetPoint(vtkIdType id, const float x[3]) { this->Data->SetTuple(id,x);};
>>  void SetPoint(vtkIdType id, const double x[3]) { this->Data->SetTuple(id,x);};
>>  void SetPoint(vtkIdType id, double x, double y, double z);
>>
>>  // Description:
>>  // Insert point into object. Range checking performed and memory
>>  // allocated as necessary.
>>  void InsertPoint(vtkIdType id, const float x[3])
>>    { this->Data->InsertTuple(id,x);};
>>  void InsertPoint(vtkIdType id, const double x[3])
>>    {this->Data->InsertTuple(id,x);};
>>  void InsertPoint(vtkIdType id, double x, double y, double z);
>>
>> vtkPolyData has a large array of points that can be indexed.
>> vtkTriangle is about working with an individual to do things like
>> compute areas, normals, etc.
>>
>> Bill
>
>
> Bill,
>
> Would you mind reading the text at the top of these and making sure it
> is clear/correct?
>
> http://www.vtk.org/Wiki/Triangle_%28on_large_point_array%29
> http://www.vtk.org/Wiki/Triangle_%28self_contained%29
>
> Thanks,
>
> David
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