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Tests: a revolved sheet over one radian is one face, untrimmed over its whole span

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SMLib revolves the cone frustum's sheet over angles 0…1 as one face, where
truck made two of half a radian each; the face's own span is angles 0…1 by
profile parameters 0…0.8: √125 · ∫₀^0.8 (5 + 5t) dt = √125 · 5.6.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
jyviko
2026-10-28 22:19:37 -04:00
committed by Irakli Kourtis
parent 2c341006a0
commit 6c9c679dcc
1 changed files with 4 additions and 4 deletions
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crates/kernel/src/surface_untrim.rs
+4 -4
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@@ -201,10 +201,10 @@ mod tests {
}
/// A revolved face: the cone frustum swept by the line from radius 5 at z = 0 to radius 10
/// at z = −10 (slant √125), its first face (angles 0…½), trimmed by the plane z = −8 + y/2.
/// at z = −10 (slant √125), one face over angles 0…1, trimmed by the plane z = −8 + y/2.
/// The cut reaches lowest (profile parameter 0.8) at angle 0, so the face's own span is
/// angles 0…½ by parameters 0…0.8, restored with arcs about the axis and straight sides:
/// ½ · √125 · ∫₀^0.8 (5 + 5t) dt = ½ · √125 · 5.6.
/// angles 0…1 by parameters 0…0.8, restored with arcs about the axis and straight sides:
/// 1 · √125 · ∫₀^0.8 (5 + 5t) dt = √125 · 5.6.
#[test]
fn a_trimmed_cone_face_is_restored_to_its_span() {
let line = vec![Seg2::Line { a: Vec2::new(5.0, 0.0), b: Vec2::new(10.0, 10.0) }];
@@ -214,7 +214,7 @@ mod tests {
let cut = crate::trim(&sheet, &tool, Vec3::new(5.0 * c, 5.0 * s, 0.0)).unwrap();
let face = face_at(&cut, Vec3::new(5.5 * c, 5.5 * s, -1.0));
let restored = untrim(&cut, face, UntrimHoles::All, true, false).unwrap();
let want = 0.5 * 125f64.sqrt() * 5.6;
let want = 125f64.sqrt() * 5.6;
let a = measure(&restored).unwrap().area;
assert!(rel(a, want) < 1e-3, "{a} vs {want}"); // (measured on meshes)
let bb = measure(&restored).unwrap().bbox;