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fem: pyramid5 element (solver, quality, decks, VTK)

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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
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jyvikoandClaude Opus 5.5 authored and Irakli Kourtis committed 2026-10-16 12:48:01 -04:00
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commit 3a5a8213a1
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+325 -28
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docs/formats/fieldcraft.md
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@@ -61,7 +61,7 @@ tagged nodes × { u32 node, u32 tag }
```
Element kind codes: 1 rod2, 2 beam2, 3 tri3, 4 tri6, 5 quad4, 6 quad8, 7 tet4, 8 tet10, 9 wedge6,
10 hex8, 11 hex20. Node order is the model's (Abaqus/VTK). A tag indexes the entity list, which
10 hex8, 11 hex20, 12 rod3, 13 pyramid5. Node order is the model's (Abaqus/VTK). A tag indexes the entity list, which
lists each geometry entity once. Coordinates keep every bit (signed zero included).
## Reading a file safely