A basic-live-cinder-json-saved-variable system using Simon Geilfus' Watchdog as a submodule.

ci::Var<float> mRadius{ 1.0f, "radius" };

In assets/, the parameter values are stored as follows in the live_vars.json file.

{
   "default" : {
      "radius" : "1.0",
   }
}

Editing and saving that file will update the value in real-time.