Box3.h

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/*************************************************************************
> File Name: Box3.h
> Project Name: CubbyFlow
> Author: Chan-Ho Chris Ohk
> Purpose: 3-D box geometry.
> Created Time: 2017/06/21
> Copyright (c) 2018, Chan-Ho Chris Ohk
*************************************************************************/
#ifndef CUBBYFLOW_BOX3_H
#define CUBBYFLOW_BOX3_H

#include <Core/Surface/Surface3.h>

namespace CubbyFlow
{
    class Box3 final : public Surface3
    {
    public:
        class Builder;

        BoundingBox3D bound = BoundingBox3D(Vector3D(), Vector3D(1.0, 1.0, 1.0));

        Box3(const Transform3& transform = Transform3(), bool isNormalFlipped = false);

        Box3(const Vector3D& lowerCorner, const Vector3D& upperCorner,
            const Transform3& transform = Transform3(), bool isNormalFlipped = false);

        explicit Box3(const BoundingBox3D& boundingBox, const Transform3& transform = Transform3(), bool isNormalFlipped = false);

        Box3(const Box3& other);

        static Builder GetBuilder();

    protected:
        // Surface3 implementations
        Vector3D ClosestPointLocal(const Vector3D& otherPoint) const override;

        bool IntersectsLocal(const Ray3D& ray) const override;

        BoundingBox3D BoundingBoxLocal() const override;

        Vector3D ClosestNormalLocal(const Vector3D& otherPoint) const override;

        SurfaceRayIntersection3 ClosestIntersectionLocal(const Ray3D& ray) const override;
    };

    using Box3Ptr = std::shared_ptr<Box3>;
    
    class Box3::Builder final : public SurfaceBuilderBase3<Box3::Builder>
    {
    public:
        Builder& WithLowerCorner(const Vector3D& pt);

        Builder& WithUpperCorner(const Vector3D& pt);

        Builder& WithBoundingBox(const BoundingBox3D& bbox);

        Box3 Build() const;

        Box3Ptr MakeShared() const;

    private:
        Vector3D m_lowerCorner{ 0, 0, 0 };
        Vector3D m_upperCorner{ 1, 1, 1 };
    };
}

#endif