SumModel.hpp

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#pragma once
 
#include <polyfem/assembler/AssemblerUtils.hpp>
#include <polyfem/basis/Basis.hpp>
 
namespace polyfem::assembler
{
    class SumModel : public NLAssembler, ElasticityAssembler
    {
    public:
        using NLAssembler::assemble_energy;
        using NLAssembler::assemble_gradient;
        using NLAssembler::assemble_hessian;
 
        // compute elastic energy
        double compute_energy(const NonLinearAssemblerData &data) const override;
        // necessary for mixing linear model with non-linear collision response
        Eigen::MatrixXd assemble_hessian(const NonLinearAssemblerData &data) const override;
        // compute gradient of elastic energy, as assembler
        Eigen::VectorXd assemble_gradient(const NonLinearAssemblerData &data) const override;
 
        // uses autodiff to compute the rhs for a fabricated solution
        // uses autogenerated code to compute div(sigma)
        // pt is the evaluation of the solution at a point
        VectorNd compute_rhs(const AutodiffHessianPt &pt) const override;
 
        // initialize material parameter
        void add_multimaterial(const int index, const json &params, const Units &units) override;
 
        std::string name() const override { return "MaterialSum"; }
        bool allow_inversion() const override { return true; }
        std::map<std::string, ParamFunc> parameters() const override;
 
    protected:
        void assign_stress_tensor(const OutputData &data,
                                  const int all_size,
                                  const ElasticityTensorType &type,
                                  Eigen::MatrixXd &all,
                                  const std::function<Eigen::MatrixXd(const Eigen::MatrixXd &)> &fun) const override;
 
    private:
        std::vector<std::shared_ptr<assembler::NLAssembler>> assemblers_;
    };
    class SumModel : public NLAssembler, ElasticityAssembler {…};
} // namespace polyfem::assembler