[vtk-developers] Pyramid and QuadraticPyramid formulation issues

[Bill Lorensen]

Folks,

As I continue to work through a comprehensive unit test for vtk cells,
I have found an issue(s) with vtkPyramid and vtkQuadraticPyramid.

For example, the parametric coordinates for the Pyramid (and Quadratic
Pyramid) place the apex at 0, 0, 1. I believe it should be centered on
the base (which would be .5, .5, 1).

Changing that causes other issues with the shape functions.

I am seeking a copy of the reference quoted in the QuadraticPyramid
code so that I can verify the implementation.
// The shape functions and derivatives could be implemented thanks to
// the report Pyramid Solid Elements Linear and Quadratic Iso-P Models
// From Center For Aerospace Structures