text: #pragma once
  
  #include "tree2/node/node.hpp"
  
  #include <array>
  #include <sstream>
  
  struct Plane : Node<> {};
  
  inline
  std::string glsl_expression(const Plane&, const std::string& arg) {
      auto ss = std::stringstream();
      ss << "sdf_plane(" 
      << arg <<  ")";
      return ss.str();
  }
  