These pages give some foundational knowledge about the building blocks of the App SDK - plugins and events: PluginsDescribes the plugins - the building blocks in a V-Ray scene. Plugin ParametersDescribes the parameter types, how to manipulate parameters, default values and other details. Plugin CategoriesDescribes the categories to which plugins can belong. Plugins can be Lights, Materials, Textures, etc. EventsDescribes how to handle events and gives notes about performance and thread safety. Plugins, Classes and Categories APIDescribes some aspects of the plugins, classes and categories API in Python and Node.js