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Forums >> Revit Building >> Technical Support >> Graphically drive family objects?
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Joined: Tue, Feb 3, 2009
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So I guess one can define families where geometry is driven by parameters, that is numerically. Any way to do it the other way around? Say line a is half the length of line b, so that adjusting line b graphically will automatically adjust line a to half the length of line b? thnx REV2009
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Sure, just set the length of line a or whatever to = LENGTH /2 Then just make them instance parameters instead of type. This will allow you to grip edit the length.
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hey - thnx for the reply however> I cannot seem to get this to work - I might be doing it wrong, but I end up with this error message: "Instance Parameters can't be used in Type Parameter formulas." would you mind breaking it down for me, step by step? cheers
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" hey - thnx for the reply however> I cannot seem to get this to work - I might be doing it wrong, but I end up with this error message: "Instance Parameters can't be used in Type Parameter formulas." would you mind breaking it down for me, step by step? cheers " Both parameters should be the same type, "length of line" and "Length", so just put the other instance as well..
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Joao Cercas
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I am getting this all wrong - maybe for clarification I'll list my step and perhaps you guys can point out where I'm going wrong with this? 1: launch RevArch2009 2: New family: Generic model 3: drawing 2 model lines 4: make temp dimension from line A permanent 5: adding parameter to dimension of line A - selecting family parameter, name: FullLength, type of parameter: predefined as "Length", selecting "instance", and "group parameter under" = "other" 6: at this point line A cannot be edited graphically by dragging its end vertices 7: make temp dimension from line B permanent 8: adding parameter to dimension of line B using same settings as mentioned in step 5 above, but usung name "HalfLength" 9: opening up dialog "family types" 10: under formula for parameter "HalfLength" set to "FullLength / 2" 11: now line B is set to half the length of line A as planned 12: BUT neither line (intention was line A) can be edited graphically by pulling its vertices, which was the point of this exercise so what am I doing wrong? do I need to save or load the family into a project file? hlp pls...
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Yes, you need to load it into a project to be able to grip edit it. When you are in the family editor, once you parameterize a dimension or whatever, the lable becomes a property of the family which is why you need to access the Family Types dialog to flex the family.
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Alright - I gave it a shot. I set up my two lines with instance parameters, one being set to be the half of the other. I have loaded this generic family into a project and placed an instance of this family into the drawing. I can change the one parameter numerically in the Element Properties dialog, but when I just select the family instance itself, I only get a middle shape handle for each of the lines. One can use these to move the entire family around, but I do not get access to endpoint handles that would allow me to drag the "master" line in order to have the other line adjust to have the new length of the master automatically (which is what I was aiming for) Is there an optionin Revit that needs to be turned on for "all shape handles" to display, or did I miss a step? thankful for (yet more) feedback
Edited on: Thu, Feb 26, 2009 at 3:36:55 PM
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If you use reference planes in your family and dimension these, then align the lines to the reference planes it will work.
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"If you use reference planes in your family and dimension these, then align the lines to the reference planes it will work." YES - that's it! Thank you so much - now I am finally getting the hang of how this Revit thing is thinking! sweet
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