BarrierContactForm.hpp

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#pragma once
 
#include "ContactForm.hpp"
#include <ipc/potentials/barrier_potential.hpp>
 
namespace polyfem::solver
{
    class BarrierContactForm : public ContactForm
    {
    public:
        BarrierContactForm(const ipc::CollisionMesh &collision_mesh,
                    const double dhat,
                    const double avg_mass,
                    const bool use_area_weighting,
                    const bool use_improved_max_operator,
                    const bool use_physical_barrier,
                    const bool use_adaptive_barrier_stiffness,
                    const bool is_time_dependent,
                    const bool enable_shape_derivatives,
                    const ipc::BroadPhaseMethod broad_phase_method,
                    const double ccd_tolerance,
                    const int ccd_max_iterations);
 
        virtual std::string name() const override { return "barrier-contact"; }
 
        virtual void update_barrier_stiffness(const Eigen::VectorXd &x, const Eigen::MatrixXd &grad_energy) override;
 
        void post_step(const polysolve::nonlinear::PostStepData &data) override;
 
        bool use_convergent_formulation() const override { return use_area_weighting() && use_improved_max_operator() && use_physical_barrier(); }
 
        bool use_area_weighting() const { return collision_set().use_area_weighting();}
 
        bool use_improved_max_operator() const { return collision_set().use_improved_max_approximator();}
 
        bool use_physical_barrier() const { return barrier_potential_.use_physical_barrier(); }
        
        void force_shape_derivative(const ipc::NormalCollisions &collision_set, const Eigen::MatrixXd &solution, const Eigen::VectorXd &adjoint_sol, Eigen::VectorXd &term) const;
 
        const ipc::NormalCollisions &collision_set() const { return collision_set_; }
        const ipc::BarrierPotential &barrier_potential() const { return barrier_potential_; }
 
    protected:
        virtual double value_unweighted(const Eigen::VectorXd &x) const override;
 
        Eigen::VectorXd value_per_element_unweighted(const Eigen::VectorXd &x) const override;
 
        virtual void first_derivative_unweighted(const Eigen::VectorXd &x, Eigen::VectorXd &gradv) const override;
 
        virtual void second_derivative_unweighted(const Eigen::VectorXd &x, StiffnessMatrix &hessian) const override;
 
        void update_collision_set(const Eigen::MatrixXd &displaced_surface) override;
 
        ipc::NormalCollisions collision_set_;
 
        const ipc::BarrierPotential barrier_potential_;
    };
}