Returns the current value (Boolean, Double, String or other supported type) of the
specified parameter. This method provides access only to the
parameters of the CustomOperator.
For example, an Operator often has
parameters that allow the user or the plug-in to configure the
operator's behavior, such as "RecursionDepth", "UDivisions",
"Height" or "CenterX".
Note: It cannot be used to retrieve the value of parameters on any
other object in the scene. For that scenario the operator should
connect to the Parameter (or object
that owns the parameter) and use OperatorContext.GetInputValue
to retrieve the parameter value.