CollectionBoundsFacade.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
#include "Containers/UnrealString.h"
#include "Containers/Array.h"
#include "Math/MathFwd.h"
#include "GeometryCollection/ManagedArrayAccessor.h"
#include "GeometryCollection/ManagedArrayCollection.h"
#include "GeometryCollection/Facades/CollectionSelectionFacade.h"
#include "Chaos/Triangle.h"
 
namespace GeometryCollection::Facades
{
 
    class FBoundsFacade
    {
    public:
 
        CHAOS_API FBoundsFacade(FManagedArrayCollection& InSelf);
        CHAOS_API FBoundsFacade(const FManagedArrayCollection& InSelf);
 
        CHAOS_API void DefineSchema();
 
        bool IsConst() const { return BoundingBoxAttribute.IsConst(); }
 
        CHAOS_API bool IsValid() const;     
 
        CHAOS_API void UpdateBoundingBox();
 
        const TManagedArray< FBox >& GetBoundingBoxes() const { return BoundingBoxAttribute.Get(); }
 
        CHAOS_API TArray<FVector> GetCentroids() const;
 
        CHAOS_API FBox GetBoundingBoxInCollectionSpace() const;
 
        static CHAOS_API TArray<FVector> GetBoundingBoxVertexPositions(const FBox& InBox);
 
        const TManagedArray< int32 >& GetTransformToGeometryIndex() const { return TransformToGeometryIndexAttribute.Get(); }
 
        CHAOS_API FSphere GetBoundingSphereInCollectionSpace();
 
        CHAOS_API FBox ComputeBoundingBox(const TArray<FVector> InPoints);
 
    protected:
 
        void UpdateTransformBasedBoundingBox();
 
        void UpdateVertexBasedBoundingBox();
 
    private:
        FSphere ComputeBoundingSphere(const FBox& InBoundingBox);
 
        void ComputeBoundingSphereImpl(const TArray<FVector>& InVertices, FSphere& OutSphere) const;
        void ComputeBoundingSphereImpl2(const TArray<FVector>& InVertices, FSphere& OutSphere) const;
        void ComputeBoundingSphere(const TArray<FVector>& InVertices, FSphere& OutSphere) const ;
 
    private:
        const FManagedArrayCollection& ConstCollection;
        FManagedArrayCollection* Collection = nullptr;
 
        TManagedArrayAccessor<FBox>         BoundingBoxAttribute;
        TManagedArrayAccessor<FVector3f>    VertexAttribute;
        TManagedArrayAccessor<int32>        BoneMapAttribute;
        TManagedArrayAccessor<int32>        TransformToGeometryIndexAttribute;
        TManagedArrayAccessor<int32>        VertexStartAttribute;
        TManagedArrayAccessor<int32>        VertexCountAttribute;
    };
 
}