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CultMath tests: LOD-far depth agreement asserted under the headline's 2x contract

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Pins LodStep's footprint branch, which only bites at LOD-far.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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Meta Vens 2026-10-16 17:17:01 +02:00
commit 658c09ecd3
1 changed files with 5 additions and 2 deletions
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7
packages/cultmath/tests/CultMath.Tests/NoiseBoundTests.cs
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@ -18,7 +18,8 @@ namespace CultMath.Tests;
/// mutations of the test's own fields and marches: w(z0) for w(z1) in VoidField.WeightBound must fail
/// WeightBoundEnclosesOneSignedNoise; CarveRadius for HollowRadius in the lo test of VoidField.Compose
/// and BodyDepth without |dir| must fail AnalyticBodyMatchesFineMarch; the footprint march's pre-body
/// integration dropped, or LodStep doubled, must fail IntervalSkipHalvesEvaluations's depth agreement.
/// integration dropped, or LodStep doubled, must fail IntervalSkipHalvesEvaluations's depth agreement; LodStep's
/// footprint z theta scaled x2 (or x4) must fail it at LOD-far.
/// </summary>
public sealed class NoiseBoundTests
{
@ -2982,7 +2983,9 @@ public sealed class NoiseBoundTests
}
var lodFar = VoidField.LodFar();
ReportVoid($"{lodFar.Name} N=8 (LOD far)", Run(lodFar, 8, 32, 0x701D, lod: true));
var far = Run(lodFar, 8, 32, 0x701D, lod: true);
ReportVoid($"{lodFar.Name} N=8 (LOD far)", far);
Assert.True(far.MaxLodDepthError <= 2.0 * far.MaxRefDepthError, $"at LOD-far, the one field where LodStep's footprint branch bites, the footprint-aware march's optical depth is off the converged march's by {far.MaxLodDepthError:G6} relative, more than twice the fixed-step march's {far.MaxRefDepthError:G6}");
var shipped = VoidField.Shipped();
var headline = Run(shipped, 8, 200, 0x5417, lod: true);