Forums >> Revit Building >> Technical Support >> LENGTH LIMITING IF STATEMENT

t1slc

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Joined: Sun, Feb 25, 2007
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I need to be able to limit the length of a component. The maximum length I can have is 6'. Anything shorther than that and it will be fine.

So how do I create an IF statement that will prevent someone from setting a lenght value greater than 6'? 

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qthdad

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Joined: Mon, Dec 10, 2007
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I think that you would need to have one parameter that accepts user input and another parameter that you use the IF statement in. Maybe

USER INPUT LENGTH: RequestedLength

COMPUTED LENGTH: ActualLength = IF (RequestedLength > 6', 6', RequestedLength)

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t1slc

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Joined: Sun, Feb 25, 2007
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It's starting to make some sense...still can't make it do what I want though.

Here is what I want: LENTH= IF(LENGTH < 6', LENGTH,0)

I want to define what the length is, but if I enter a value greater than 6' want it to fail or give me some error that won't allow the length to be greater than 6'. Since the geometery is tied to the LENGTH parameter that is the one I want to control. However, with this IF statement it gives me a circular reference error and won't let me do it. 

Here's what I have...

A component with geometry locked to LENGTH 

I created a MAX LENGTH parameter = 6

Then another parameter LENGTH USER VALUE = IF(LENGTH < MAX LENGTH, LENGTH, 0)

This will give me the correct value in the LENGTH USER VALUE, but that isn't tied to any geometery. If I try to do something like LENGTH USER VALUE = LENGTH, I get a circular reference error.

How do I do this? 

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qthdad

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Joined: Mon, Dec 10, 2007
64 Posts

How about this?

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