IntrRay3OrientedBox3.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "BoxTypes.h"
#include "IntrRay3AxisAlignedBox3.h"
#include "OrientedBoxTypes.h"
#include "VectorUtil.h"
 
namespace UE
{
namespace Geometry
{
 
using namespace UE::Math;
 
template <typename RealType>
class TIntrRay3OrientedBox3
{
public:
 
    static bool FindIntersection(
        const TRay<RealType>& Ray, 
        const TOrientedBox3<RealType>& Box,
        RealType& RayParamOut)
    {
        const TVector<RealType> OriginOffset = Ray.Origin - Box.Frame.Origin;
 
        const TVector<RealType> Axis0 = Box.Frame.GetAxis(0);
        const TVector<RealType> Axis1 = Box.Frame.GetAxis(1);
        const TVector<RealType> Axis2 = Box.Frame.GetAxis(2);
 
        const TVector<RealType> Origin = TVector<RealType>(
            TVector<RealType>::DotProduct(OriginOffset, Axis0),
            TVector<RealType>::DotProduct(OriginOffset, Axis1),
            TVector<RealType>::DotProduct(OriginOffset, Axis2));
 
        const TVector<RealType> Direction = TVector<RealType>(
            TVector<RealType>::DotProduct(Ray.Direction, Axis0),
            TVector<RealType>::DotProduct(Ray.Direction, Axis1),
            TVector<RealType>::DotProduct(Ray.Direction, Axis2));
 
        const TRay<RealType> AdjustedRay(Origin, Direction);
 
        const TAxisAlignedBox3<RealType> AxisAlignedBox(
            TVector<RealType>(-Box.Extents.X, -Box.Extents.Y, -Box.Extents.Z),
            TVector<RealType>(Box.Extents.X, Box.Extents.Y, Box.Extents.Z));
 
        return TIntrRay3AxisAlignedBox3<RealType>::FindIntersection(AdjustedRay, AxisAlignedBox, RayParamOut);
    }
};
 
typedef TIntrRay3OrientedBox3<float> FIntrRay3OrientedBox3f;
typedef TIntrRay3OrientedBox3<double> FIntrRay3OrientedBox3d;
 
} // end namespace UE::Geometry
} // end namespace UE