How can I select a nested family type by a parameter

[MiWolff]

In a door family, I have a numerical parameter that contains a number that determines whether the door handles are standard handle bars, knobs or public building type bars or combinations of any. The number 10 would select a standard handle on the inside and exterior sides of the leaf and leave "DD" in a shared parameter that is used in our door schedules. To have this same parameter also choose the family type of the door handles, I tried to make another if(condition,this,that) formula but ran into a 'Inconsistent units' error.

How can that be fixed?

[Ilic.Andrej]

You re gonna have to forget about the family/type parameter. Associate the nested family parameters with the host family parameters. Then, you can play with the formulas. Those can be put in the nested family or host family (depending on your strategy). The idea is to have yes/no parameters which constrain the geometry visibility while having formulas like: 

code.Drücker=10

Based on what I understood while reading your post and observing the family that you created, I think it was a mistake to create code.Drücker as a number parameter. It should be integer.

[FAIR59 · Accepted solution]

You can make the nested-family dependent on the code-drucker parameter.

• In the Griffe-family, make the reference plane through the centre of the handle [Defines Origin]

In the door family:

• Make the code-drucker type of parameter: Integer .
• Make as many parameters (type of parameter : Family<Doors>) as there are choices. {  Griffe_1, Griffe_2 etc.}
• Label the nested_TurGriff family { Griffe_Formula }
• Make formula to choose nested family, using if- statements. (see picture)

 

[MiWolff]

Brilliant this is exactly what I wanted. I'd love to click this as 'Accept as answer' but that button does not seem to be around. Just after posting this the button in question showed up - seemingly you need to be logged in first ;-).

[Anonymous]

You are a genius! I've been trying to change family for the whole day before your post.

[snehil_jalanMP5D2]

Thanks for the solution. I was facing the same issue. I need to ask further if the same thing can be possible without the parameters you made for every type and instead use a formula directly to call specific type of nested family.

P.S. I have similar family with 12 types where the names of types are similar to that in parent family.

[sdewittHX66A]

I have the same question as snehil.  is it possible for me to right a formula saying something similar to...
 if (DECK EXTERIOR, <family type(x)>, <family type(y)>)
the goal is to "hard code" the family type selection based on a few yes/no parameters...

[RSomppi]

It's possible but gets quite complicated very quickly.

[sdewittHX66A]

any examples you can share

[RSomppi]

Even if I could share my families, they probably wouldn't help much. There are a number of ways to accomplish it. I got the information I needed from a couple of sources online. Alfredo Medina has a couple of good articals.

[dtiemeyer]

Is there a way to read the value of the selected nested family and produce a result?  And if so, what is the correct syntax? For example, related to post 3 above:

If (Griffe_1<Doors> = a_Turgriffe_r172 : KB, "X", "Y")

[MiWolff]

@dtiemeyer I am afraid your approach is to Revit like comparing two text parameters. The whole value selects entities, families, text values thing is run by a number determining the outcome. Btw. the number parameter does not need to be an integer - it just looks prettier not having decimals.

[dtiemeyer]

Thanks @MiWolff , that's what I was afraid of, but not surprised.