[petsc-users] Inquiry about PetscDTSimplexQuadrature .

[neil liu]

Dear Petsc developers,

I am learning  *PetscDTSimplexQuadrature *and plan to use it.
I found that, in the biunit simplex (tetra),
(-1,-1,-1),(1,-1,-1),(-1,1,-1),(-1,-1,1),
degree 1: npoints 4, the sum of weights = 4/3(the volume of this simplex)
degree 2 : npoints 8;
For my previous experience, I used Gauss quadrature rules, (npoints =4 , 5,
11, 15).
Then  I am curious what rule is Petsc using ?
And is *PetscDTSimplexQuadrature *used by PetscFE?

Thanks a lot,

Xiaodong