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Add reference states for the Stable Neo-Hookean inverted-tetrahedra scene - #142

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lililii124:fix/6220-stable-neohookean-regression
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lililii124:fix/6220-stable-neohookean-regression

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@lililii124 lililii124 commented Oct 10, 2026 •

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Related to sofa-framework/sofa#6220.

Adds the regression marker and compressed state reference for the corrected Stable Neo-Hookean inverted-tetrahedra example.

SOFA's native WriteState generated 100 position frames for 576 nodes at dt=1e-5. All recorded values are finite. Repeating the run with CompareState reported zero error; removing the force field produced an error of 0.05614 against the 1e-4 threshold.

Validation used a Windows native C++ harness in double precision. The upstream Regression_test executable and cross-platform CI were not exercised.

Companion SOFA fix: sofa-framework/sofa#6377. These references must be used with that scene change.

AI assistance was used for implementation, tests and validation.

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