Triangle3.h

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/*************************************************************************
> File Name: Triangle3.h
> Project Name: CubbyFlow
> Author: Chan-Ho Chris Ohk
> Purpose: 3-D triangle geometry.
> Created Time: 2017/04/04
> Copyright (c) 2018, Chan-Ho Chris Ohk
*************************************************************************/
#ifndef CUBBYFLOW_TRIANGLE3_H
#define CUBBYFLOW_TRIANGLE3_H

#include <Core/Surface/Surface3.h>

namespace CubbyFlow
{
    class Triangle3 final : public Surface3
    {
    public:
        class Builder;

        std::array<Vector3D, 3> points;

        std::array<Vector3D, 3> normals;

        std::array<Vector2D, 3> uvs;

        Triangle3(
            const Transform3& transform = Transform3(),
            bool isNormalFlipped = false);

        Triangle3(
            const std::array<Vector3D, 3>& points,
            const std::array<Vector3D, 3>& normals,
            const std::array<Vector2D, 3>& uvs,
            const Transform3& transform = Transform3(),
            bool isNormalFlipped = false);

        Triangle3(const Triangle3& other);

        double Area() const;

        void GetBarycentricCoords(
            const Vector3D& pt,
            double* b0,
            double* b1,
            double* b2) const;

        Vector3D FaceNormal() const;

        void SetNormalsToFaceNormal();

        static Builder GetBuilder();

    protected:
        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 Triangle3Ptr = std::shared_ptr<Triangle3>;

    class Triangle3::Builder final : public SurfaceBuilderBase3<Triangle3::Builder>
    {
    public:
        Builder& WithPoints(const std::array<Vector3D, 3>& points);

        Builder& WithNormals(const std::array<Vector3D, 3>& normals);

        Builder& WithUVs(const std::array<Vector2D, 3>& uvs);

        Triangle3 Build() const;

        Triangle3Ptr MakeShared() const;

    private:
        std::array<Vector3D, 3> m_points;
        std::array<Vector3D, 3> m_normals;
        std::array<Vector2D, 3> m_uvs;
    };
}

#endif