topic Parametric Family - Formula in Revit Architecture Forum

Parametric Family - Formula

cklLJAHD — Thu, 30 Mar 2023 08:39:12 GMT

Hello,

I am making a parametric industrial bookshelf, which is produced in 2030 mm, 3030 mm and so on in length.

I want to make it round down or up like for example:

Length is above 2500 and it rounds to 3030 and if under, it rounds to 2030.

I have tried following formula, but can't get it to work:

IF (Length<2500, IF true, Length = 2030, IF false, Length = 3030)

IF (Length<2500, Length = 2030)

IF (Length <2500, Length = 2030) IF (Length <2500, Length = 3030)

Any help is appreciated!

Best Regards,

Re: Parametric Family - Formula

MetalFingerz — Thu, 30 Mar 2023 08:19:41 GMT

Hi @cklLJAHD ,

The IF condition follows this structure :

IF(<condition>, <result if condition is true>, <result if condition is false>)

So for your issue, it would look like this :

IF(Length < 2500, 2030, 3030)

Because your condition is "Length < 2500", if the Length is actually inferior 2500 then the Length parameter should be 2030 otherwise, it would be 3030.

EDIT :

Forgot to note that you should use a second parameter for your test as you cannot self reference one. So you need to have :

- Length for your input

- LengthCondition (or name it whatever you want) for the formula

It's the LengthCondition that should be the label of the dimension in your object.

Re: Parametric Family - Formula

FuldenYilmaz — Thu, 30 Mar 2023 08:13:15 GMT

For the process, You should use some sub-parameters, yes no parameters. You can control the links. Or you can send the family I try to write the formula.

https://forums.autodesk.com/t5/revit-mep-forum/if-then-formula-and-quot-yes-no-quot-parameter/td-p/2662720

https://help.autodesk.com/view/RVT/2020/ENU/?guid=GUID-A0FA7A2C-9C1D-40F3-A808-73CD0A4A3F20

If the explanation and links above help, please close the case as answered, if the problem still persists, I expect you to share more details with me.

I wish you good work.

Best regards,

Fulden Yılmaz MSc. Architect - BIM Consultant

Re: Parametric Family - Formula

cklLJAHD — Thu, 30 Mar 2023 08:38:39 GMT

It simply states that: 'There is circular chain of references among formulas'.

I have edited the post to include the files.

Re: Parametric Family - Formula

cklLJAHD — Thu, 30 Mar 2023 08:40:08 GMT

I have attached the files, since I am not entirely sure what to do since this is the first time using several formulas.

Re: Parametric Family - Formula

FuldenYilmaz — Thu, 30 Mar 2023 08:54:40 GMT

I wrote and uploaded, I hope it is okey.

Let me know if you have more questions on this topic, otherwise please accept as a solution so that others can benefit from this information.

Best regards,

Fulden Yılmaz MSc. Architect - BIM Consultant

Re: Parametric Family - Formula

mhiserZFHXS — Thu, 30 Mar 2023 13:04:44 GMT

@cklLJAHD wrote:
It simply states that: 'There is circular chain of references among formulas'.
I have edited the post to include the files.

You need to follow @MetalFingerz post more closely, as that is the solution.