Function ParameterAsReal(expression: String, index: Integer, [calc:Boolean=FALSE]) : Real
Returns an Real extracted from the expression.
This function extracts a Real at index (begins counting at 1) from an expression such as ",param1, param2, param3"
For an example, see ExpressionParameters.
If calc is set to TRUE, any expression in the parameter is calculated. This is useful for real-time scripting.