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Clean-up flex assumptions.

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Do not allow a mix of `elastic2d != none` with `dof = trilinear` since the latter assumes 3d elasticity.

Also, do not assume that `flex_interp > 0` in the engine. This will enable to use, e.g., `flex_interp = -1` to mean a linear surface finite element instead of a 3d finite element which is currently identified with `flex_interp = 1`.

PiperOrigin-RevId: 903852035
Change-Id: Ia6290b4a05e9e510ffb7f36d141cd525b40d3110
This commit is contained in:
Alessio Quaglino
2026-04-22 08:00:42 -07:00
committed by Copybara-Service
parent 863a084d7f
commit a891782553
14 changed files with 84 additions and 10 deletions
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doc/XMLreference.rst
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@@ -4328,7 +4328,7 @@ stress-strain relationship. See also :ref:`deformable <CDeformable>` objects and
:at:`elastic2d`: :at-val:`[none, bend, stretch, both], "none"`
Elastic contribution to passive forces of 2D flexes. "none": none, "bend": bending only, "stretch": stretching only,
"both": bending and stretching.
"both": bending and stretching. Not yet supported by :ref:`dof<body-flexcomp-dof>` **trilinear** and **quadratic**.
.. _flex-contact: