NEW in 3ds Max 2015: The following functions provide access to File Dialog, Custom Gamma and Meta Data of Render Elements.
ElementFileDialog <render_element>
Opens the Save File Dialog of the specified render element instance.
ElementGetCustomGamma <render_element>
Returns the Custom Gamma value of the specified render element instance.
If no custom Gamma has been defined, returns 0.0.
ElementSetCustomGamma <render_element> <gamma>
Sets the Custom Gamma value of the specified render element instance to the float value given by the second argument.
ElementGetMetaData <render_element>
Returns an array containing the Meta Data of the specified render element instance.
If no Meta Data is defined, returns an empty array #().
ElementSetMetaData <render_element> <metaData_array>
Sets the Meta Data of the specified render element instance to the array values given by the second argument.