Need help with Element.SetParameterByName

Revit
1

hi there
I have a problem with changing the instance parameter to curtain grid family, the angel’s changes in dynamo between the normal and sunbath, but the instance parameter on Revit won’t change, I used spring element type to make the Element.SetParameterByName node work, but still the family parameter won’t change!

Capture.JPG993×482 155 KB

here it is some images shows nodes and how the normal lines and curves appear on revit, but still NCP value dose not change , thanks for your help ^^
note: i got those nodes from a website for profissor Roh

2

First question, why you use elementType.duplicate from Springs? You probably want to filter element types by boolmask, but not sure.

3

thanks for replying Tomas, I will give it a try. but i think i will get an “no function called” error

4

Capture.png3566×1812 426 KB
and there it is !

5

Your parameter name needs to match exactly: NCP not ncp.

6

thanks for replying @Nick_Boyts , i solved by using "spring null set parameter "