Hello! I just started learning Dynamo and I’m in love with it. I’m wondering if it’s possible to create a filled region over a wall automatically with Dynamo by just choosing the wall type?
Example:
It would be ideal if I could just chose the wall type and it does this instantly for that wall.
Is this even possible?
Thanks in advance 
you could change the “cut” pattern in the view template? this will also save you time if the wall thickness / layout changes?
You could get the face references of the walls and turn them into polycurves and then make a filled region.
However, unless you’ve got a really specific need for that or are just doing as a ‘something interesting to try in Dynamo’ exercise, then I’d avoid filled regions. This is the sort of thing you could handle natively in Revit with filters in your VG/templates. Even setting up Dynamo to do ‘override graphics in view’ for you would likely be a better solution than filled regions, but I’d probably even avoid that if possible.
No, it’s not possible for a specific need. So I need to create a filled region over the wall. Do you know how can I automate that with Dynamo? To just select the wall type and it does it for you? Is it even possible?
I need it for a specific need.
Is this the node that get the face references of the walls you are talking about?
I can’t figure out how to create the polycurves from face references.
Hi Alban! Thank you for the great advice
I managed to create a script that works! The only problem is that it looks like this:
Is creates a separate filled region for every wall instead of creating one single filled region for all walls.
Is this possible to fix somehow?
Surface.Union (or something similar, can’t recall the exact name) will merge those surfaces into a single surface.
No I have never tried PolySurface.ByJoinedSurfaces before. I tried using it now but it gives me the same result:
I can’t find any node with the name Surface.Union but there are many similiar and I’m not sure which one it is because I don’t understand how they work 
Is it any of these:
i think you need to use List.Flatten before the Polysurface node
BEFORE the polysurface node
(it will make a list of surface instead of a list of list, then a single surface))
The node I was referring to is Surface.ByUnion. It will probably just do the same thing as the Polysurface node, so either or there.
Hi @Hamish !
I can’t find the Surface.ByUnion. From what package is it?
I tried using the Polysurface node but I get an error as you can see above in my previous comment
It’s an OOTB node.
