Bonchellon
a95b299680
Editor plugin that detects geometrically-identical sibling StaticMeshes across a level, rebases each placement onto one canonical mesh with a corrected transform (W' = D * W, verified by exact vertex matching), and can collapse groups into HISM. Native Slate tool panel + BlueprintCallable UOptimizerSubsystem. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
54 lines
2.2 KiB
C++
54 lines
2.2 KiB
C++
// Copyright IHY.
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#pragma once
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#include "CoreMinimal.h"
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class UStaticMesh;
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/**
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* Rotation/translation-invariant geometry fingerprint of a single UStaticMesh, plus the
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* (lazily loaded) welded vertex cloud used for exact pairwise verification.
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*
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* Source is always LOD0 FMeshDescription (the imported authoring geometry) so the fingerprint
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* is stable across LOD reduction / Nanite / build settings. Render data is a tagged fallback.
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*/
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struct FOptMeshGeom
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{
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static constexpr int32 NumRadialBins = 16;
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bool bValid = false;
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bool bRenderDerived = false; // true if extracted from render data (compare only against other render-derived)
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int32 RawVertexCount = 0;
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int32 WeldedVertexCount = 0; // unique positions after welding -> the hard fingerprint gate
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int32 TriangleCount = 0;
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double SurfaceArea = 0.0; // local space, rigid-invariant, scales as s^2
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double Volume = 0.0; // |signed tetrahedron sum|, scales as s^3
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FVector Centroid = FVector::ZeroVector; // mean of welded positions (local origin for cov/hist)
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double EigenValues[3] = { 0.0, 0.0, 0.0 }; // covariance eigenvalues, sorted DESC (rotation-invariant)
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double RadialHistogram[NumRadialBins] = { 0.0 }; // normalized hist of |v - centroid|
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FBox LocalBounds = FBox(ForceInit);
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// Heavy payload, populated only when this mesh enters pairwise recovery (bWantPositions).
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TArray<FVector> Positions; // welded unique positions, local space
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// Material / section signature (NOT part of geometry grouping; used to partition for HISM).
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uint32 MaterialHash = 0;
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int32 SectionCount = 0;
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};
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namespace OptimizerGeometry
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{
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/**
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* Extract the fingerprint (and optionally the welded position cloud) for a static mesh.
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* @param WeldEps position weld grid in cm.
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* @param bWantPositions also fill Out.Positions (the expensive part) for verification.
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* @return false if no usable geometry could be read.
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*/
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bool ExtractGeom(const UStaticMesh* Mesh, float WeldEps, bool bWantPositions, FOptMeshGeom& Out);
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/** Symmetric 3x3 Jacobi eigensolver. Eigenvalues returned sorted DESC; eigenvectors as columns of OutVecs. */
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void SymmetricEigen3x3(const double M[3][3], double OutValues[3], double OutVecs[3][3]);
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}
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