A thin part trimmed by a long one is no longer refused as an implausible result: a 437 mm bar with a 3 mm concave arc in its profile, cut by a 920 mm prism with a top tilted 21 degrees, failed with "implausible result volume 3870" (it was 3694 before the cut)

The boolean checks its result by meshing both operands and the result, then sampling membership densely where the operands' boxes overlap. The mesh step came from the larger body's size (0.46 mm here), which facets the bar's 3 mm arc so coarsely that two meshes of the same arc disagree over a few percent of the thin overlap box, and a correct cut failed the 0.4 % mismatch limit. The step now also follows the smallest side of the overlap box (2e-3 of it), never finer than 1e-5 of the size, so it only changes where the bodies meet in a region much thinner than they are. truck's first result for the cut is then accepted, and it matches a split of the bar by the tilted plane.

Tests: oblique_cut_through_a_small_arc_matches_a_split replays examples/regressions/oblique_cut_of_cylinder.json and compares with solid.split_body by the same plane (fails on main). The full suite runs no slower.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/engine/src/boolean_regression_tests.rs

@@ -1,7 +1,7 @@
 //! Booleans that failed, panicked or hung, replayed from the scripts in
 //! `examples/regressions/` (each script's description says what went wrong).
 
-use serde_json::Value;
+use serde_json::{Value, json};
 
 use crate::Session;
 
@@ -32,3 +32,22 @@ fn shallow_loft_cut_from_the_top_face() {
     let got = volume(&s, "Body1");
     assert!((got - want).abs() < 1e-9 * want, "{got} vs {want}");
 }
+
+#[test]
+fn oblique_cut_through_a_small_arc_matches_a_split() {
+    let scripts = [include_str!("../../../examples/regressions/oblique_cut_of_cylinder.json")];
+    // The same bar split by the prism's tilted top: the piece above it is the cut's result.
+    let mut split = Session::default();
+    let script: Value = serde_json::from_str(scripts[0]).unwrap();
+    let steps = script.get("commands").and_then(Value::as_array).unwrap();
+    split.run_script(&Value::Array(steps[..5].to_vec())).unwrap();
+    let whole = volume(&split, "Tool");
+    split.execute("solid.split_body", &json!({"body": "Tool", "plane": {"origin": [0, -472, 853.91], "normal": [0, 15.44, 40]}})).unwrap();
+    let above = volume(&split, "Tool");
+    assert!(above < whole - 10.0, "{above} of {whole}");
+    for script in scripts {
+        let s = replay(script);
+        let got = volume(&s, "Tool");
+        assert!((got - above).abs() < 1e-6 * above, "{got} vs {above}");
+    }
+}