I’d like to check whether a group is mirrored or not. select groups: done checking if familyinstance.facingorientation doesn’t work (probably because it’s a group) So I figured if I’m able to check a group’s orgin point I can check if it’s mirrored or not. (the x-vector points to the right: not …

Very clever @Andreas_Dieckmann so here’s a revised version of my previous post: [image] Given one instance of the group, you get to know wether any other instance of the group is mirrored or not! import clr clr.AddReference('RevitAPI') from Autodesk.Revit.DB import* clr.AddReference('RevitNodes'…

Yes, it matters a great deal. Imagine that in a group instance you’re checking the first family instance has been excluded. In that case you would compare the first family instance in your reference group with the second family instance in your test group. If both the first and the second family ins…

Agreed @Andreas_Dieckmann , that does matter indeed. :+1:

@Andreas_Dieckmann , I want to spice things up. Or better said, the mirrored check has to be done on the first familyinstance of the group, not the ‘nested’ familyinstance of the group. So if in group curtain wall with custom family instance’s (so non system panel, let’s say a window) door with s…

Not sure I understand. You’re saying elements in curtain walls would have to be ignored because they behave differently?

Yes. indeed. All elements in curtain walls should be ignored (because they shouldn’t trigger the mirrored decision). So I create a group [A] containing a window family (test) a curtain wall (wally) a door as panel in (wally). I consider that group to be the ‘non mirrored version’. Next I crea…

I wonder if this applies to other types of assemblies as well like trusses or beam systems… I’ll add a check to disqualify family instances depending on their host type. For starters this would be curtain walls, curtain systems and glazed roofs.

@3Pinter I ran a test and it looks like doors in curtain walls are not an issue as their behaviour is ecatly the same as that of doors hosted in standard walls: [grafik]

@Andreas_Dieckmann , Hmmm, I don’t get the same results. I did a test where I only group a curtainwall (with a custom door panel (family instance)). Flipping that door resuls in a flipped status, while it’s actually not a flipped version of the whole curtain wall. [Knipsel] So H40 has been duplic…

Now I see what you did. You can’t compare instances of different group types. The node should return nulls in such cases.

Group is mirrored (or not)

Revit

lUNi September 30, 2017, 11:21am 38

Thanks!

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Group is mirrored (or not)

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