Mass.hpp

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#pragma once
 
#include <polyfem/assembler/Assembler.hpp>
#include <polyfem/assembler/MatParams.hpp>
#include <polyfem/utils/AutodiffTypes.hpp>
 
namespace polyfem::assembler
{
    class Mass : public LinearAssembler
    {
    public:
        using LinearAssembler::assemble;
 
        Eigen::Matrix<double, Eigen::Dynamic, 1, 0, 9, 1>
        assemble(const LinearAssemblerData &data) const override;
 
        Eigen::Matrix<double, Eigen::Dynamic, 1, 0, 3, 1> compute_rhs(const AutodiffHessianPt &pt) const override;
 
        void add_multimaterial(const int index, const json &params, const Units &units) override;
 
        const Density &density() const { return density_; }
 
        std::string name() const override { return "Mass"; }
        virtual std::map<std::string, ParamFunc> parameters() const override;
 
    private:
        // class that stores and compute density per point
        Density density_;
    };
} // namespace polyfem::assembler