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8fd2394228
- Add MakeBoundsFromIndices() utility functions to TAxisAlignedBox3 to simplify computing bounding-box of point sets - FDynamicMesh3::GetVertexFrame() can now take an externally-provided normal, and so now can be used without computing VertexNormals attribute - Add FModuloIteration to IteratorUtil for doing quasi-random-ish iterations over index ranges - Add CollectVertexPositions() to MeshIndexUtil.h, for creating arrays/sets of vertex positions as a one-liner - Add FMeshWeights::CotanWeightsBlendSafe() to support cotan-based smoothing of arbitrary properties - Add TMinVolumeBox3::SolveSubsample() which will (quasi-randomly) subsample a set of the input points to reduce cost of box computation #rb david.hill #rnx #jira none [CL 16450731 by Ryan Schmidt in ue5-main branch]
65 lines
2.5 KiB
C++
65 lines
2.5 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreMinimal.h"
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#include "VectorTypes.h"
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#include "OrientedBoxTypes.h"
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#include "Templates/PimplPtr.h"
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class FProgressCancel;
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namespace UE {
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namespace Geometry {
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template <typename RealType> struct TMinVolumeBox3Internal;
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/**
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* Calculate a Minimal-Volume Oriented Box for a set of 3D points.
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* This internally first computes the Convex Hull of the point set.
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* The minimal box is then guaranteed to be aligned with one of the faces of the convex hull.
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* Note that this is increasingly expensive as the Convex Hull face count increases.
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*/
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template<typename RealType>
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class TMinVolumeBox3
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{
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public:
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/**
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* Calculate the minimal box for the given point set.
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* @param NumPoints number of points in the set, ie GetPointFunc can be called for any integer in range [0...NumPoints)
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* @param GetPointFunc function that returns a 3D point for a valid Index
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* @param bUseExactBox If true, high-precision number types are used for the minimal-box calculation, rather than doubles. This is *much* slower but more accurate (but not recommended).
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* @return true if minimal box was found
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*/
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bool Solve(int32 NumPoints, TFunctionRef<FVector3<RealType>(int32)> GetPointFunc, bool bUseExactBox = false, FProgressCancel* Progress = nullptr);
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/**
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* Calculate the minimal box for a Subsampling of MaxPoints points of a point set
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* @param NumPoints number of points in the set, ie GetPointFunc can be called for any integer in range [0...NumPoints)
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* @param NumSamplePoints maximum number of points to sample from NumPoints. Currently a random-ish subset is selected.
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* @param GetPointFunc function that returns a 3D point for a valid Index
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* @param bUseExactBox If true, high-precision number types are used for the minimal-box calculation, rather than doubles. This is *much* slower but more accurate (but not recommended).
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* @return true if minimal box was found
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*/
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bool SolveSubsample(int32 NumPoints, int32 NumSamplePoints, TFunctionRef<FVector3<RealType>(int32)> GetPointFunc, bool bUseExactBox = false, FProgressCancel* Progress = nullptr);
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/** @return true if minimal box is available */
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bool IsSolutionAvailable() const;
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/** @return minimal box in BoxOut */
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void GetResult(TOrientedBox3<RealType>& BoxOut);
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protected:
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void Initialize(int32 NumPoints, bool bUseExactBox);
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TPimplPtr<TMinVolumeBox3Internal<RealType>> Internal;
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};
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typedef TMinVolumeBox3<float> FMinVolumeBox3f;
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typedef TMinVolumeBox3<double> FMinVolumeBox3d;
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} // end namespace UE::Geometry
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} // end namespace UE
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