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Add a balanced test assembly

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This test assembly reveals one way that the engine can stall, indicated
by a long plateau in the loss history. You can make the plateau even
longer by shrinking the inner spheres.
This commit is contained in:
Aaron Fenyes 2025-07-03 16:27:28 -07:00
parent fae3f4531e
commit 27a8cbfd69
1 changed files with 64 additions and 0 deletions
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64
app-proto/src/add_remove.rs
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@ -238,6 +238,68 @@ fn load_pointed_assemb(assembly: &Assembly) {
}
}
/* DEBUG */
// the initial configuration of this test assembly deliberately violates the
// constraints, so loading the assembly will trigger a non-trivial realization
fn load_balanced_assemb(assembly: &Assembly) {
// create the spheres
const R_OUTER: f64 = 10.0;
const R_INNER: f64 = 4.0;
let spheres = [
Sphere::new(
"outer".to_string(),
"Outer".to_string(),
[0.75_f32, 0.75_f32, 0.75_f32],
engine::sphere(0.0, 0.0, 0.0, R_OUTER)
),
Sphere::new(
"a".to_string(),
"A".to_string(),
[1.00_f32, 0.00_f32, 0.25_f32],
engine::sphere(0.0, 4.0, 0.0, R_INNER)
),
Sphere::new(
"b".to_string(),
"B".to_string(),
[0.00_f32, 0.25_f32, 1.00_f32],
engine::sphere(0.0, -4.0, 0.0, R_INNER)
),
];
for sphere in spheres {
let _ = assembly.try_insert_element(sphere);
}
// get references to the spheres
let [outer, a, b] = ["outer", "a", "b"].map(
|id| assembly.elements_by_id.with_untracked(
|elts_by_id| elts_by_id[id].clone()
)
);
// fix the diameters of the outer, sun, and moon spheres
for (sphere, radius) in [
(outer.clone(), R_OUTER),
(a.clone(), R_INNER),
(b.clone(), R_INNER)
] {
let curvature_regulator = sphere.regulators().with_untracked(
|regs| regs.first().unwrap().clone()
);
let curvature = 0.5 / radius;
curvature_regulator.set_point().set(
SpecifiedValue::try_from(curvature.to_string()).unwrap()
);
}
// set the inversive distances between the spheres. as described above, the
// initial configuration deliberately violates these constraints
for inner in [a, b] {
let tangency = InversiveDistanceRegulator::new([outer.clone(), inner]);
tangency.set_point.set(SpecifiedValue::try_from("1".to_string()).unwrap());
assembly.insert_regulator(Rc::new(tangency));
}
}
// setting the inversive distances between the vertices to -2 gives a regular
// tetrahedron with side length 1, whose insphere and circumsphere have radii
// sqrt(1/6) and sqrt(3/2), respectively. to measure those radii, set an
@ -507,6 +569,7 @@ pub fn AddRemove() -> View {
"general" => load_gen_assemb(assembly),
"low-curv" => load_low_curv_assemb(assembly),
"pointed" => load_pointed_assemb(assembly),
"balanced" => load_balanced_assemb(assembly),
"radius-ratio" => load_radius_ratio_assemb(assembly),
"irisawa-hexlet" => load_irisawa_hexlet_assemb(assembly),
_ => ()
@ -560,6 +623,7 @@ pub fn AddRemove() -> View {
option(value="general") { "General" }
option(value="low-curv") { "Low-curvature" }
option(value="pointed") { "Pointed" }
option(value="balanced") { "Balanced" }
option(value="radius-ratio") { "Radius ratio" }
option(value="irisawa-hexlet") { "Irisawa hexlet" }
option(value="empty") { "Empty" }