Sphere3.h

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/*************************************************************************
> File Name: Sphere3.h
> Project Name: CubbyFlow
> Author: Chan-Ho Chris Ohk
> Purpose: 3-D sphere geometry.
> Created Time: 2017/04/04
> Copyright (c) 2018, Chan-Ho Chris Ohk
*************************************************************************/
#ifndef CUBBYFLOW_SPHERE3_H
#define CUBBYFLOW_SPHERE3_H

#include <Core/Surface/Surface3.h>

namespace CubbyFlow
{
    class Sphere3 final : public Surface3
    {
    public:
        class Builder;

        Vector3D center;

        double radius = 1.0;

        Sphere3(
            const Transform3& transform = Transform3(),
            bool isNormalFlipped = false);

        Sphere3(
            const Vector3D& center,
            double radius,
            const Transform3& transform = Transform3(),
            bool isNormalFlipped = false);

        Sphere3(const Sphere3& other);

        static Builder GetBuilder();

    private:
        Vector3D ClosestPointLocal(const Vector3D& otherPoint) const override;

        double ClosestDistanceLocal(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 Sphere3Ptr = std::shared_ptr<Sphere3>;

    class Sphere3::Builder final : public SurfaceBuilderBase3<Sphere3::Builder>
    {
    public:
        Builder& WithCenter(const Vector3D& center);

        Builder& WithRadius(double radius);

        Sphere3 Build() const;

        Sphere3Ptr MakeShared() const;

    private:
        Vector3D m_center = { 0, 0, 0 };
        double m_radius = 0.0;
    };
}

#endif