Forums >> Revit Building >> Technical Support >> yes/no formula

vidhikholia

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Joined: Mon, Mar 28, 2011
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Trying to find a formula for this situation....

AA, BB & CC are parameters

when CC is turned on, BB and AA turns on;

when BB is turned on, AA turns on and CC turns off;

when AA is turned on, BB and CC turns off.

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gebber

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Joined: Thu, Jan 24, 2008
144 Posts

there are many ways easiest way I gues is;

select AA, in the properties go to, visible and click the box @ the end of the line.

ad parameter and call it AA and set it as a visibility .

do the same with BB & CC.

Whebn these 3 parameters are set go to the Family Types, under family types choose new and call it AA, make sure you check the box with AA and uncheck the boxes BB & CC. repeat this for BB & CC.

load the family in a project to see the results

(in the family you can check wich ellement shows by checking if it has a grey or black outerline)

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frifer

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Joined: Mon, Jul 30, 2012
107 Posts

hi! not sure of what i am saying beacuse i am pretty new with revit! i think that your request creates internal conflicts because when CC is turned on it turns on AA wich then turns off CC.. so basically you cannot turn on CC..

what i would do is create three more variables. (on off switches) like this:

SwitchAA

SwitchBB

SwitchCC

AA

BB

CC

and would put these formulas for these:

SwitchAA: if (OR(SwitchBB , SwitchCC), 2<1,1<2 )

SwitchBB: if (OR(SwitchAA , SwitchCC), 2<1,1<2 )

SwitchCC: if (OR(SwitchAA , SwitchBB), 2<1,1<2 )

AA: if(OR(OR(SwitchAA, SwitchBB),SwitchCC),1<2,2<1)

BB: if(AND(OR (SwitchBB, SwitchCC), NOT SwitchAA) ,1<2,2<1)

CC: if(AND(AND(OR(SwitchCC, SwitchBB), NOT SwitchAA),NOT SwitchBB),1<2,2<1)

i did not test it so it might need a few modifications. hope you get what i mean. if you try to explain better what you are trying to achive it might be easier to help...

regards

Igor

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frifer

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Joined: Mon, Jul 30, 2012
107 Posts

just tried, it does not work. its a circular reference.. sorry

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frifer

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Joined: Mon, Jul 30, 2012
107 Posts

here we go.. tested and works.. hope it is what you need!

Attached Images

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vidhikholia

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Joined: Mon, Mar 28, 2011
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@gebber: I already did that but wanted something which would be automatic like with formulas. Thanx for the reply.

@frifer: ur formula worked like a charm! thanks alot!

Kind Regards,

Vidhi

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gebber

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Joined: Thu, Jan 24, 2008
144 Posts

@ frifer nice formula,

Anyhow, what advantage does this give you?

Now the family contains calculations wich slow up the model and costs a lot of extra time, besides when a 3rd party has to work with it it takes a lot of time to figure out how this works.

This is why I try to keep it as basic and simple as I can.

I agree it's the most beautifull way to create it like frifer discribes.

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frifer

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Joined: Mon, Jul 30, 2012
107 Posts

i would create it with a single parameter insted of the 6 yes/no boxes. i posted that as solution since it was the request.

so instead of having all the switch variables etc i would use a integer that can be a value between 1 and 3 and based on that change all the other variables.

it avoids having multiple checkboxes on at the same time while only one is actually changeing something because it has a higher priority.

so, if AA BB and CC are just some variables in the model and not the checkboxes:

Switch on number (is an integer between 1 and 3)

AA: if(Switch on number = 1, 2345 mm, 6541 mm)

BB: if(Switch on number = 2, 2645 mm, 1541 mm)

CC: if(Switch on number = 3, 345 mm, 641 mm)

in case of switches its even easier:

Switch:  if(Switch on number = 1,1<2, 2<1)

its easy tu understand, to use, and to implement.

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