forked from 1b-agent/fieldcraft-upstream
A five-node pyramid, the conforming transition between a hexahedron's face and tetrahedra: Bedrosian's rational shape functions with a collapsed (Duffy) Gauss rule, a certified Jacobian on the base square with exact volume, a scaled Jacobian, C3D5 / CPYRAM / LS-DYNA degenerate solid, VTK_PYRAMID and the binary mesh code 13. A distorted hex8-pyramid5-tet4 transition mesh passes the patch test and uniaxial tension exactly. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo