ImplicitSurfaceSet3.h

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/*************************************************************************
> File Name: ImplicitSurfaceSet3.h
> Project Name: CubbyFlow
> Author: Dongmin Kim
> Purpose: 3-D implicit surface set.
> Created Time: 2017/04/18
> Copyright (c) 2018, Dongmin Kim
*************************************************************************/
#ifndef CUBBYFLOW_IMPLICIT_SURFACE_SET3_H
#define CUBBYFLOW_IMPLICIT_SURFACE_SET3_H

#include <Core/Geometry/BVH3.h>
#include <Core/Surface/ImplicitSurface3.h>

#include <vector>

namespace CubbyFlow
{
    class ImplicitSurfaceSet3 final : public ImplicitSurface3
    {
    public:
        class Builder;

        ImplicitSurfaceSet3();

        ImplicitSurfaceSet3(
            const std::vector<ImplicitSurface3Ptr>& surfaces,
            const Transform3& transform = Transform3(),
            bool isNormalFlipped = false);

        ImplicitSurfaceSet3(
            const std::vector<Surface3Ptr>& surfaces,
            const Transform3& transform = Transform3(),
            bool isNormalFlipped = false);

        ImplicitSurfaceSet3(const ImplicitSurfaceSet3& other);

        void UpdateQueryEngine() override;

        size_t NumberOfSurfaces() const;

        const ImplicitSurface3Ptr& SurfaceAt(size_t i) const;

        void AddExplicitSurface(const Surface3Ptr& surface);

        void AddSurface(const ImplicitSurface3Ptr& surface);

        static Builder GetBuilder();

    private:
        std::vector<ImplicitSurface3Ptr> m_surfaces;
        mutable BVH3<ImplicitSurface3Ptr> m_bvh;
        mutable bool m_bvhInvalidated = true;

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

        BoundingBox3D BoundingBoxLocal() const override;

        double ClosestDistanceLocal(const Vector3D& otherPoint) const override;

        bool IntersectsLocal(const Ray3D& ray) const override;

        Vector3D ClosestNormalLocal(const Vector3D& otherPoint) const override;

        SurfaceRayIntersection3 ClosestIntersectionLocal(const Ray3D& ray) const override;

        // ImplicitSurface3 implementations.
        double SignedDistanceLocal(const Vector3D& otherPoint) const override;

        void InvalidateBVH() const;

        void BuildBVH() const;
    };

    using ImplicitSurfaceSet3Ptr = std::shared_ptr<ImplicitSurfaceSet3>;

    class ImplicitSurfaceSet3::Builder final : public SurfaceBuilderBase3<ImplicitSurfaceSet3::Builder>
    {
    public:
        Builder& WithSurfaces(const std::vector<ImplicitSurface3Ptr>& surfaces);

        Builder& WithExplicitSurfaces(const std::vector<Surface3Ptr>& surfaces);

        ImplicitSurfaceSet3 Build() const;

        ImplicitSurfaceSet3Ptr MakeShared() const;

    private:
        bool m_isNormalFlipped = false;
        std::vector<ImplicitSurface3Ptr> m_surfaces;
    };
}

#endif