petscmaster 20201026
DMPlexCreateBasisRotation
Create an internal transformation from the global basis, used to specify boundary conditions and global solutions, to a local basis, appropriate for discretization integrals and assembly.
Synopsis
#include "petscdmplex.h"
PetscErrorCode DMPlexCreateBasisRotation(DM dm, PetscReal alpha, PetscReal beta, PetscReal gamma)
Input Parameters
 dm   The DM

 alpha   The first Euler angle, and in 2D the only one

 beta   The second Euler angle

 gamma   The third Euler angle

Note: Following https://en.wikipedia.org/wiki/Euler_angles, we will specify Euler angles by extrinsic rotations, meaning that
we rotate with respect to a fixed initial coordinate system, the local basis (xyz). The global basis (XYZ) is reached as follows
$ The XYZ system rotates about the z axis by alpha. The X axis is now at angle alpha with respect to the x axis.
$ The XYZ system rotates again about the x axis by beta. The Z axis is now at angle beta with respect to the z axis.
$ The XYZ system rotates a third time about the z axis by gamma.
See Also
DMPlexGlobalToLocalBasis(), DMPlexLocalToGlobalBasis()
Level
developer
Location
src/dm/impls/plex/plexfem.c
Index of all DMPLEX routines
Table of Contents for all manual pages
Index of all manual pages