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• Basic types: int, bool, float, Color (3 float RGB), AColor (4 float ARGB), Vector (3 float), string (UTF-8), Matrix (3 Vectors), Transform (a Matrix and a Vector for translation).
• Objects: references to other plugin instances.
• Typed lists: The typed lists in App SDK are IntList, FloatList, ColorList, VectorList, TransformList and VectorList PluginList.
• Generic heterogeneous lists: The In C++, the App SDK uses a generic type class called Value for items in a generic list. In C#, Python and Node.js, native language types are used (lists or arrays). Note that generic lists can be nested.
• Output parameters
  : These are additional values generated by a given plugin which may be used as input by others. For example the TexAColorOp plugin (described in section 5.2) can be referenced directly as a texture, resulting in its default color texture output, but you can also refer to any of its other outputs, like sum, difference, maximum etc. for different results (Note: in some cases connecting an output parameter to an input parameter may not work directly, so you'd have to make the connection through a wrapper plugin like TexAColor or TexFloat).
  In AppSDK output parameters are represented by the PluginRef type which combines a plugin reference and an output name.

Parameter polymorphism is an important feature of V-Ray. Texture parameters accept simple (basic) values, so instead of creating an additional texture plugin which generates a single color you just set a Color value to the texture slot. Same goes for float textures and single float values etc. You can also set the value of a texture parameter to an output parameter as described above.

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