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Forums >> Revit Building >> Technical Support >> Specifying Numeric Parameters with Text
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Joined: Mon, Oct 9, 2006
12 Posts
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I have been trying to construct a family for a steel tubing and mesh wall system. I have started with the curtainwall panel and curtain wall door family templates. I am running into a few issues, though, with how to input parameter values, limiting parameter options, and being able to send human readable information to the schedule.
I have made the material parametric, so that when I go into the Type Properties window, I can link to the Materials Pallette. When the family is loaded into the project, though, all possible materials are available. Is there a way that I can limit this so that there is a specific list of materials available if someone wants to change the material while in the project? Is there a way to make a drop-down box of pre-determined materials rather than going to the Materials window?
The next problem, then, is: after the material is specified, is there a way to have that material choice dictate numeric parameters? I tried to set up an IF statement in my mesh thickness parameter that would refer to the material chosen and return a value based on wire gauges. Revit returned an error that formulas can ONLY use numeric or yes/no values, so using my Material parameter was not an option.
Piggy-backing on that issue, is it possible at all to use a text parameter to specify a numeric parameter value. In my example, I would like to be able to have the user input a wire gauge rather than an actual length value (e.g. enter "8 gauge" rather than "0.16" . Even better would be to have a parameter with a drop-down box of pre-determined gauges and have the material thickness base itself on the gauge chosen.
Thanks in advance for anyone that has any insight to this at all.
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Joined: Wed, Mar 29, 2006
197 Posts
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Wow. There is a lot here, and I can only help with a little of it. Try making a Family Type for each guage. Then in each type you can spec the thickness, and material that is oppropriate. This would answer your problems in the last 2 paragraphs.
As far as I know you will always be directed to the full material list from the properties menu. If each Family Type had it's own material specified, then users wouldn't need to go edit it.
Hope there is some help here for you.
ArchWestCY
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Joined: Mon, Oct 9, 2006
12 Posts
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That helps a little bit. The only problem that I have with it is that we are going to have a lot of different combinations. I am building a system for zoo animal holding caging. Depending on the animal there are going to be different specifics for the mesh opening size and the wire gauge. On top of that, there are going to be different needs for other portions of the family (specifically tubing width and depth). If I were to limit myself to family types rather than each piece being dynamic, I would both limit myself in options, and have a cumbersome number of family types to work with.
I was actually able to solve my specifying-gauge-not-actual-gauge-thickness problem by setting up an integer parameter and referencing it in the thickness dimansion parameter using a 23 statement deep nested IF statement for the formula, specifying each gauge. The limit there was that at some point I had to stop, so if someone puts an integer in higher than 22, it returns with the thickness for 22GA wire. Everything from 0GA to 22GA works fine, though... I don't think that we will have a case where we need cages made with smaller than 22GA, it really woudn't hold any animals in.
Thanks for the idea, I am still playing around with doing something like that.
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