obj_writer.hpp

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#ifndef GENERATOR_OBJWRITER_HPP
#define GENERATOR_OBJWRITER_HPP
 
#include <sstream>
 
#include "mesh_vertex.hpp"
#include "triangle.hpp"
 
namespace generator
{
 
class obj_writer_t
{
public:
    obj_writer_t();
 
    template<typename Mesh>
    void write_mesh(const Mesh& mesh)
    {
        int newBase = base_;
 
        for(const mesh_vertex_t& vertex : mesh.vertices())
        {
            ++newBase;
 
            ss_ << "v " << vertex.position[0] << " " << vertex.position[1] << " " << vertex.position[2] << "\n";
 
            ss_ << "vn " << vertex.normal[0] << " " << vertex.normal[1] << " " << vertex.normal[2] << "\n";
 
            ss_ << "vt " << vertex.tex_coord[0] << " " << vertex.tex_coord[1] << "\n";
        }
 
        for(const triangle_t& triangle : mesh.triangles())
        {
            auto t = triangle.vertices + base_;
            ss_ << "f " << t[0] << "/" << t[0] << "/" << t[0] << " " << t[1] << "/" << t[1] << "/" << t[1] << " "
                << t[2] << "/" << t[2] << "/" << t[2] << "\n";
        }
 
        base_ = newBase;
    }
 
    std::string str()
    {
        return ss_.str();
    }
 
private:
    int base_;
 
    std::stringstream ss_;
};
} // namespace generator
 
#endif