message: Cmdline option to activate depth of field
diff: @@ -176,6 +176,14 @@ struct renderer : viewer_type
  cl::init(this->use_headlight)
  ) );
  + add_cmdline_option( cl::makeOption<bool&>(
  + cl::Parser<>(),
  + "dof",
  + cl::Desc("Activate depth of field"),
  + cl::ArgRequired,
  + cl::init(this->use_dof)
  + ) );
  +
  add_cmdline_option( cl::makeOption<unsigned&>(
  cl::Parser<>(),
  "bounces",
  