Change Arrowhead parameter for all family types of a family

[cescobar]

@john_pierson was very kind to start guiding me in this endeavor in a previous thread and think it’s best I start a new thread as that one was already solved.
I’m trying to change all the arrowhead parameter of all the types of a specific generic annotation family without having to go one by one for each type.
After a quick tutorial, I started experimenting with the Revit nodes in the latest version of Dynamo. I got this far:

It was suggested that I use “Arrowhead Assigner” and would like to know how to incorportate it or if I’m even going down the right path.

Thank you, everyone!

[Brendan_Cassidy]

The arrowhead parameter requires a element instead of a string so you have to get the arrowhead element and plug that into the value.

[Kulkul]

Hi @cescobar

And also Remember your setting the family type so you should do this changes before you assign arrowhead element types.

[cescobar]

Thanks @Brendan_Cassidy
How do I get the element of a specific arrowhead so that I can plug that in?

[john_pierson]

[cescobar]

Thanks, @john_pierson!

I love how everyone is so helpful and responsive in this community.

It’s pretty exciting when you see it do its magic.

[john_pierson]

Awesome thing. This was actually the first thing I did when I learned Dynamo. Ah, the memories!

Great work!

[Kulkul]

@cescobar Could you please mark @john_pierson reply as solution. Thanks!

Here is how to mark.

[cescobar]

Thank you as well @Kulkul.

[eric_koehne]

I have a dead-line and was wondering if someone would be so link as to upload this DYN.

[cescobar]

Change Arrowheads in Family Types - Keynote-Blocknote Tag - RM.dyn (7.5 KB)
You’ll have to tinker with it a little. Hope this helps.

[rgesner]

John’s nodes and the Rhythm Arrowhead Assigner both work great (thanks to both), EXCEPT …

…after a lot of poking into this and searching, I still can’t find any way to set leader arrowheads to “None”.
I can’t find an ElementType for None to use in John’s nodes, and the Rhythm Arrowhead Assigner fails with “None” as an input.

Any solution for None would be wonderful.

• Rusty

[robertkang26]

Hi, This is a great start.
I changed great number of mine to be consistant however after 200ish changed, it starts to erase associated note blocks. Literally, deletes the family.

Would you know what is causing this? I am thinking element ownership or there’s a threshold on the number of items you can change?

Would anyone know?

[cescobar]

I haven’t experienced this or maybe didn’t notice. Do you mean that it deleted some elements (instances of the family) or the entire family from the model?

[robertkang26]

It deletes entire family from the model.

So, if I had the note block on the legend and also a user referenced on multiple views, they are all gone. I think it is the dynamo language issue or there is a flaw in the algorythm.

[Brendan_Cassidy]

If you are having a issue that is away from the original post you should start up a new topic.

Setting a parameter that accepts elements can be set to null via some python code and utilizing “InvalidElementId” which can be found within the SDK for revit.