ConvexVolume.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
 
/*=============================================================================
    ConvexVolume.h: Convex volume definitions.
=============================================================================*/
 
struct FOutcode
{
private:
    bool bInside;
    bool bOutside;
 
public:
 
    // Constructor.
 
    FOutcode():
        bInside(false), bOutside(false)
    {}
    FOutcode(bool bInInside,bool bInOutside):
        bInside(bInInside), bOutside(bInOutside)
    {}
 
    // Accessors.
 
    void SetInside(bool bNewInside) { bInside = bNewInside; }
    void SetOutside(bool bNewOutside) { bOutside = bNewOutside; }
    bool GetInside() const { return bInside; }
    bool GetOutside() const { return bOutside; }
};
 
//
//  FConvexVolume
//
 
struct FConvexVolume
{
public:
 
    typedef TArray<FPlane,TInlineAllocator<6> > FPlaneArray;
    typedef TArray<FPlane,TInlineAllocator<8> > FPermutedPlaneArray;
 
    FPlaneArray Planes;
    FPermutedPlaneArray PermutedPlanes;
 
    FConvexVolume()
    {
//      int32 N = 5;
    }
 
    FConvexVolume(const TArray<FPlane, TInlineAllocator<6>>& InPlanes) :
        Planes( InPlanes )
    {
        Init();
    }
 
    ENGINE_API void Init(void);
 
    ENGINE_API bool ClipPolygon(class FPoly& Polygon) const;
 
    // Intersection tests.
 
    ENGINE_API FOutcode GetBoxIntersectionOutcode(const FVector& Origin,const FVector& Extent) const;
 
    ENGINE_API bool IntersectBox(const FVector& Origin,const FVector& Extent) const;
 
    ENGINE_API bool IntersectBox(const FVector& Origin,const FVector& Extent, bool& bOutFullyContained) const;
 
    ENGINE_API bool IntersectSphere(const FVector& Origin,const float& Radius) const;
 
    ENGINE_API bool IntersectSphere(const FVector& Origin,const float& Radius, bool& bOutFullyContained) const;
 
    ENGINE_API bool IntersectTriangle(const FVector& PointA, const FVector& PointB, const FVector& PointC, bool& bOutFullyContained) const;
 
    ENGINE_API bool IntersectLineSegment(const FVector& Start, const FVector& End) const;
 
    ENGINE_API float DistanceTo(const FVector& Point) const;
 
    ENGINE_API bool IntersectBox(const FVector& Origin,const FVector& Translation,const FVector& Extent) const;
 
    bool IntersectPoint(const FVector& Point) const
    {
        return IntersectSphere(Point, 0.0f);
    }
 
    friend ENGINE_API FArchive& operator<<(FArchive& Ar,FConvexVolume& ConvexVolume);
};
 
extern ENGINE_API void GetViewFrustumBounds(FConvexVolume& OutResult, const FMatrix& ViewProjectionMatrix, bool bUseNearPlane);
 
extern ENGINE_API void GetViewFrustumBounds(FConvexVolume& OutResult, const FMatrix& ViewProjectionMatrix, bool bUseNearPlane, bool bUseFarPlane);
 
extern ENGINE_API void GetViewFrustumBounds(FConvexVolume& OutResult, const FMatrix& ViewProjectionMatrix, const FPlane& InFarPlane, bool bOverrideFarPlane, bool bUseNearPlane);