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Tet mesh quality: one validity criterion, Delaunay refinement, ODT, Klingner–Shewchuk, tet10

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The end-to-end demo met a raw-CDT sliver that the validity gate accepted (exactly positive) and
the solver refused. Now:

- One validity criterion, `fieldcraft_model::admissible_jacobian` (normalized Jacobian above
  1e-12), used by the implicit solver (fem `positive_inverse`), the explicit tet4/hex8
  kinematics and the mesh gate, which proves it on the whole element (tet4: the solvers' own
  Jacobian; curved kinds: a Bernstein floor), so whatever passes the gate passes the solvers.
- CDT rounding repaired by flips on the rounded mesh (Diazzi et al. 2023 §5.1) instead of the
  ±2-ulp nudge.
- `fieldcraft-mesh::tet`: a mutable tetrahedral complex whose every change is a checked
  replacement (positive and admissible tetrahedra, faces matched with opposite orientation) with
  an exact undo log; edge removal (Klincsek), multi-face removal, Delaunay insertion with
  boundary faces, edge collapse; a curvature- and thickness-graded size field; constrained
  Delaunay refinement with encroachment splits; ODT smoothing; the Klingner–Shewchuk schedule;
  boundary vertices moved onto the exact B-rep surfaces at the end; tet10 with mid-edge nodes on
  the geometry.
- `mesh.tet.generate` gains size, order, quality, quality_target, curvature_angle, grading,
  max_passes, max_points and reports the CDT's and the mesh's quality; `solve.probe` takes a set
  and reports its largest von Mises stress.
- Oracle cases filleted-bracket-fillet-stress(-coarse): the fillet's peak von Mises stress on
  tet10 meshes of 2k and 13.5k elements, 213.3 MPa (a four-level study stays within 1.8%); the
  CDT cases keep the raw tetrahedralization.
- Corpus quality columns: all 20 valid parts mesh and pass the gate.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm
This commit is contained in:
jyvikoandClaude Opus 5.5 authored and Irakli Kourtis committed 2026-10-14 08:28:49 -04:00
1 parent fed27d816d
commit 9469ac0853
53 files changed
+5880 -278
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crates/engine/src/lib.rs
+33 -11
View File
@@ -15,6 +15,8 @@
pub mod autosave;
pub mod catalogue;
pub mod cmd;
pub use cmd::analytic_surfaces;
pub mod history;
pub mod results;
pub mod sample;
@@ -365,7 +367,8 @@ mod tests {
json!({"format": "nastran", "path": "/no/such/dir/part.bdf", "steps": vec!["x".repeat(1000); 2000]}),
json!({"format": "nastran", "path": "/no/such/dir/part.bdf", "steps": {}}),
json!({"path": 7}),
json!({"body": "Body1", "tolerance": 0.05}),
// (`max_points` and `max_passes` keep mesh.tet.generate's quality stage small.)
json!({"body": "Body1", "tolerance": 0.05, "max_points": 3000, "max_passes": 1}),
json!({"body": null, "tolerance": "fine"}),
json!({"elements": [u32::MAX, -1, 1.5]}),
json!({"elements": {}, "bins": -5}),
@@ -385,7 +388,7 @@ mod tests {
json!({"polygon": [[0, 0], [1, 0], [0, 1]], "holes": [[[0.1, 0.1], [0.2, 0.1], [0.1, 0.2]], [[0.1, 0.1], [0.2, 0.1], [0.1, 0.2]]], "size": 0.2}),
json!({"polygon": [["a", 0], [1, null], {}], "size": "big", "kind": 7}),
json!({"polygon": [[0, 0], [1, 0], [0, 1]], "size": 1e300, "kind": "tri6", "max_elements": 1e300}),
json!({"body": "Body1", "face": "", "tolerance": 0.05, "size": 1}),
json!({"body": "Body1", "face": "", "tolerance": 0.05, "size": 1, "max_points": 3000, "max_passes": 1}),
// Structured hex meshing.
json!({"size": -1, "order": 9, "method": "x"}),
json!({"size": 1e-300}),
@@ -515,15 +518,34 @@ mod tests {
json!({"body": "Body1", "tolerance": 1e-300}),
json!({"body": "Body1", "tolerance": 1e300}),
json!({"body": "Body2", "tolerance": 0.1}),
json!({"body": "Body1", "tolerance": 0.5, "surface": 0}),
json!({"body": "Body1", "tolerance": 0.5, "weld": 0}),
json!({"body": "Body1", "tolerance": 0.5, "weld": 1e-3}),
json!({"body": "Body1", "tolerance": 0.5, "weld": f64::MIN_POSITIVE}),
json!({"body": "Body1", "tolerance": 0.5, "weld": 0, "weld_distance": 0}),
json!({"body": "Body1", "tolerance": 0.5, "weld_distance": 1e300}),
json!({"body": "Body1", "tolerance": 0.5, "weld_distance": 0.05}),
json!({"body": "Body1", "tolerance": 0.5, "feature_angle": 1e-300}),
json!({"body": "Body1", "tolerance": 0.5, "feature_angle": null}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "max_passes": 1, "surface": 0}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "max_passes": 1, "weld": 0}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "max_passes": 1, "weld": 1e-3}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "max_passes": 1, "weld": f64::MIN_POSITIVE}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "max_passes": 1, "weld": 0, "weld_distance": 0}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "max_passes": 1, "weld_distance": 1e300}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "max_passes": 1, "weld_distance": 0.05}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "max_passes": 1, "feature_angle": 1e-300}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "max_passes": 1, "feature_angle": null}),
// The quality stage's own parameters, hostile, with small caps so this stays fast.
json!({"body": "Body1", "tolerance": 0.5, "size": 0}),
json!({"body": "Body1", "tolerance": 0.5, "size": -1}),
json!({"body": "Body1", "tolerance": 0.5, "size": 1e300}),
json!({"body": "Body1", "tolerance": 0.5, "size": 1e-300, "max_points": 2000, "max_tets": 5000}),
json!({"body": "Body1", "tolerance": 0.5, "size": "fine"}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "order": "cubic"}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "order": "quadratic", "quality": false}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "quality": "yes"}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "quality_target": 0}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "quality_target": 1e300}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "curvature_angle": -1}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "curvature_angle": 1e-300, "max_points": 2000}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "grading": 0}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "grading": f64::MAX}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "max_passes": 1e9}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "max_points": 0}),
json!({"body": "Body1", "tolerance": 0.5, "size": 20, "max_points": 30, "max_passes": 1}),
json!({"body": "Body1", "tolerance": 0.5, "size": 0.5, "max_tets": 3000, "max_passes": 1}),
json!({"body": "Body1", "size": 1e-300}),
json!({"body": "Body1", "size": 1e300, "order": 2}),
json!({"body": "Body1", "size": 4, "method": "sweep", "order": 2}),