topic Re: Stair family with multiple variations formula in Revit Architecture Forum

Stair family with multiple variations formula

J450NP13 — Mon, 02 May 2016 16:52:50 GMT

I am modeling a set of stairs with steps going up to a porch at first floor height. I want to make the porches height parametric and the steps to change with the height of the porch.

Everything is working....but I cannot figure out how to use the formula to make the first two steps visibility on or off when the porch is lower and only needs one step.

Re: Stair family with multiple variations formula

L.Maas — Mon, 02 May 2016 17:02:53 GMT

If you can post what you have up to now we can have a look what is possible.

Re: Stair family with multiple variations formula

J450NP13 — Mon, 02 May 2016 17:04:57 GMT

Here is the family. This is only a test for workflow purposes.

Re: Stair family with multiple variations formula

L.Maas — Mon, 02 May 2016 17:47:32 GMT

Just a possible solution

If you need to build in possibility of (many) more steps I probably would start to look at a nested whereby you control the stairs section in the nested component.

Re: Stair family with multiple variations formula

J450NP13 — Tue, 03 May 2016 14:27:45 GMT

I can't seem to understand your logic behind the code you're writing. I am pretty quick when it comes to understanding programming...but I'm not getting it.

Re: Stair family with multiple variations formula

L.Maas — Tue, 03 May 2016 15:21:09 GMT

Basically what I am doing is the following:

-Determine the amount of steps needed. Below or equal to 0' 6" 0 steps, Higher than 0' 6" 1 step, Higher than 1' 1" 2 steps, Higher than 1' 8" 3 steps

-When the foundation height gets below 1' 8" I hide step 1 and lower step 2 from 1' 2" to 0' 7" and step 3 from 1' 7" to 1' 2".

-When the foundation height gets below 1' 1" I hide step 1 and step 2 and lower step 3 to 0' 7".

See attached example

Re: Stair family with multiple variations formula

J450NP13 — Tue, 03 May 2016 15:23:51 GMT

Ok, I understand that.

What is the "Steps Needed" Parameter?

Re: Stair family with multiple variations formula

L.Maas — Tue, 03 May 2016 15:31:17 GMT

I use that as an intermediary step to calculate if I need 1, 2 or 3 steps, based on the foundation height.

You could incorpotate this calculation in the the Visble_Step1, Visble_Step2 and Visble_Step3 formulas

Re: Stair family with multiple variations formula

J450NP13 — Tue, 03 May 2016 15:34:53 GMT

I understand now.

Isn't there a way I can just create a formula that if I select that specific family in the name box that it just automatically hides those steps by putting that formula in their formula boxes? Instead of depending on the height of the foundation?

Re: Stair family with multiple variations formula

J450NP13 — Tue, 03 May 2016 15:44:56 GMT

What is the "Steps Needed" parameter type? An int? What is the parameter grouped under?

Re: Stair family with multiple variations formula

L.Maas — Tue, 03 May 2016 15:58:45 GMT

You can check it easily.

It is an integer. It is grouped under Other. You can edit it and group it under another category if you like (e.g. constraints).

Re: Stair family with multiple variations formula

J450NP13 — Tue, 03 May 2016 17:44:58 GMT

Ok, I am getting it. I see how Steps Needed you're declareing what it is.

But I am not getting the formula in the dimensions for the steps.

Re: Stair family with multiple variations formula

L.Maas — Tue, 03 May 2016 18:25:32 GMT

The Step 2 Rise formula:

-If "Visble_Step1 "is visble (i.e. is true, thus has a checkmark) then the height of this step should be 0' 11" otherwise it should be 0' 7"

-Because we hide step 1, step 2 becomes th first step and should be lower

-When step 1 is visble (at 0 '7") step 2 must be higher, thus 0'11"

The Step 3 Rise formula:

-If "Visble_Step1" is visible/true then the height of this third step should be 1' 7". (We have three steps)

If "Visble Step 2" is visible/true but not "Visble_Step1" then third step should be 1' 2" (We have two steps)

If not than third step should be 0' 7" (We have zero or one step)

-The if statement stops when a true statement is observed.

-When "Visble_Step1" is visible/true then automatically step 2 is also visible/true thus step 3 must be highest at 1' 7"

-When Step 1 is not visble/false then revit goes to check next statement. If step 2 is visible (step 1 was already checked not to be visible) thus we have two steps thus Step 3 must be 1' 2" .

-When Step 1 and Step 2 are not visble then we only have step 3 left and it shall be 0' 7" (If it is even lower than also this step will be hidden)

Try to experiment with the family and see what it does and how it works.

Re: Stair family with multiple variations formula

J450NP13 — Tue, 03 May 2016 18:29:40 GMT

Thank you.

I see how the syntax is now...I really appreciate it.

Re: Stair family with multiple variations formula

J450NP13 — Wed, 04 May 2016 17:31:35 GMT

Louis,

When I do that it has an issue with constriants and then wants to delete the extrusions.

Re: Stair family with multiple variations formula

L.Maas — Wed, 04 May 2016 22:43:36 GMT

A few posts back I uploaded a modified version of the stairs (Stairs_test2.rfa). Did you have a look at that one?

Re: Stair family with multiple variations formula

J450NP13 — Thu, 05 May 2016 12:42:08 GMT

I'm in 2015

Re: Stair family with multiple variations formula

L.Maas — Thu, 05 May 2016 13:02:55 GMT

Do not have 2015 available at the moment.

Upload your family with what you have got so far and I will have a look

Re: Stair family with multiple variations formula

J450NP13 — Thu, 05 May 2016 13:06:47 GMT

Here is what I have.

Re: Stair family with multiple variations formula

L.Maas — Thu, 05 May 2016 13:23:17 GMT

Strange. I opened your family (in Revit 2017) and added the two formulas for "Step 2 RISE" and "Step 3 RISE" as in the screenshot.

I get no errors.

What do you do to get those errors?