C# data types

[onrender]

Is it the answer?

This method is instance, not static?

Findclippingplanesforviewport" method

You should use doc.FindClippingPlanesForViewport(viewe.ActiveViewport) The FindClippingPlanesForViewport method is an instance method, not a static method. If it were static you could use it like your code above. But now, you need an instance of the class RhinoDoc and call the method on that instance.