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Forums >> Revit Building >> Technical Support >> If parameter usage
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Joined: Thu, May 28, 2009
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Hey, I'm feeling kinda stupid today and I'm banging my head against a family parameter issue.
I'm working on a countertop/sink family, and I want to constrain the sink spacing in a way such that they cannot be placed outside of the plane of the countertop. Right now the sinks are flexible, but if you drag the sink off the plane of the counter, the nested void family has nothing to cut and the family crashes. Bam.
Therefore, I want to add an If parameter to the dimensions of the sink so that they cannot pass the edge of the counter. However, IF parameters require two outcomes.
My parameter should read something like:
If ((sink offset) > (counter length)) , ((counter length)-1') , (?????)
Basically, I don't want the "If not true" value to be a rigid, constrained value, but the formula syntax requires it. So how do I allow my family to have flexible value that only get constrained when they break a certain value?
Edited on: Fri, Aug 28, 2015 at 2:10:16 PM
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Joined: Tue, May 16, 2006
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sink offset rteplaces ????
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If I do that, it tells me I have a circular chain of references. So I can't reference the same paramater the formula is for. I wish! I basically only want the first half of an IF statement.
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Joined: Tue, May 16, 2006
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Will it work if it is (sink offset)*1 ? or + 0"
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Still no luck there. I'm thinking that maybe I can use a progression of variables, like... "Sink Centerline"="Sink Offset" and all math affects "Sink Centerline" so that "Sink Offset" is always a stump, but I feel like I'm going down the rabbit hole.
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I don't understand why the nested famil crashes? My standard countertop has a nested face based void that can be placed off the countertop if you don't want it.
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That's precisely what I have--a face based void sweep that cuts a hole in the countertop for the sink to sit in--but it cannot leave its host surface. I get a "Can't cut instance(s) of sink void out of its host." error in the family editor.
Is your void nested in your sink, maybe? and then the countertop?
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I should add that my family has up to 4 sinks, and while it's easy to hide and unhide sinks, I wasn't able to hide and unhide cut geometry, since a hidden cut is still a cut. What I've done is move the void cuts so t hat they're still interacting/cutting the host countertop in the backsplash where it isn't visible.
My countertop file is in my uploaded files section if you're curious. I'd reupload by I'm currently in the process of mangling the one on my computer.
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