ImplicitSurfaceNetwork/primitive_process/interface/subface/simple/cylinder_face.hpp

#pragma once

#include <base/subface.hpp>

namespace internal
{
// local: cylinder face x^2+y^2-1=0
struct cylinder_face_t final : subface {
    static constexpr uint64_t             max_degree  = 2;
    static constexpr equation_system_type eq_sys_type = equation_system_type::implicit;

    std::function<double(Eigen::Vector3d)>          fetch_sdf_evaluator() const override;
    std::function<Eigen::Vector3d(Eigen::Vector3d)> fetch_sdf_grad_evaluator() const override;

    // u: planar angle from x-axis to z-axis
    // v: depth/height from xz-plane to y-axis
    std::function<Eigen::Vector4d(double, double)> fetch_point_by_param_evaluator() const override;
    std::function<Eigen::Vector2d(Eigen::Vector3d)> fetch_param_mapping_evaluator() const override;

    std::function<constraint_curve_intermediate(double)> fetch_curve_constraint_evaluator(parameter_u_t constraint_var_type,
                                                                                          double        u) const override;
    std::function<constraint_curve_intermediate(double)> fetch_curve_constraint_evaluator(parameter_v_t constraint_var_type,
                                                                                          double        v) const override;
    std::function<equation_intermediate_t(constraint_curve_intermediate &&)> fetch_solver_evaluator() const override;
};
} // namespace internal

namespace detail
{
struct cylinder_surface_tag{};

template <>
struct tagged_hasher<internal::paired_model_matrix_ptr_t, cylinder_surface_tag> {
    size_t operator()(const internal::paired_model_matrix& block) const
    {
        auto R = block.world_to_local.linear().topLeftCorner<2, 3>(); // 2x3
        auto b = block.local_to_world.translation(); // 3x1
        
        Eigen::Matrix<double, 3, 4> hash_mat = Eigen::Matrix<double, 3, 4>::Zero();
        hash_mat.topLeftCorner<3, 3>() = R.transpose() * R;
        hash_mat.topRightCorner<2, 1>() = R * b;

        return hash_funcs(hash_mat);
    }
};
} // namespace detail