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Forums >> Community >> Newbies >> Instance or Type parameter?
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Joined: Wed, Aug 22, 2007
28 Posts
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I think this may be a very simple question, but I want to be absolutely sure before I start creating more and more complex families and explaining the procedure to others. What are ‘type’ specific parameters and when do I want to use them? What are ‘instance’ specific parameters and when do I want to use that? Simple, but in-depth answer would be awesome!!!
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Joined: Thu, Nov 10, 2005
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Ok im going to use an example of a Countertop. Most coutertops you will use in a project will have a few different depths and a few different hights off the floor...this would be a good use for Type Parameters. While something like the lenght of the coutertop may vary all over the place and you may never have any countertop that is the same exact length as another...this is a good use for Instance Parameters. For another example we will use windows/doors (similar) Height and Width of doors and windows are fairly standard and wont have a million different types in a projcet, doors are typicaly 3-0 7-0 and vary slightly from there. Where as the thickness varies what the walls are, one layer of gyp, two layers of gyp, 6" stud, 3" stud, 1' concrete so thickness would be a good thing for instance. The difference between the two is type paramter if changed will change all instances of that type lets say your door is 3-0 7-0 and you have it as a type and you change that door to actually be 3-1 7-0, all doors with the type 3-0 7-0 will be changed to a width of 3-1. Instance will only change the one object and will have no effect on any of the other objects. Hope that helps and was simple, in-depth, and not too long of an explanation.
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Joined: Wed, Aug 22, 2007
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Okay so to relay that back to you: if I am creating a custom W-flange beam, the depth of the beam and width of the flange will all be ‘type’ parameters. That way a 12 x 19 is a ‘type’ as a 16 x 16 would be another ‘type.’ In order to define these parameters the reference plane or dimension lines that are used to define the beam’s depth and width have to be deemed as ‘type’ when I add a parameter to them. Now if I were to create an angled dimension that would depend on how the beam was positioned in the model and would vary from beam to beam, that dimension parameter would be deemed as an ‘instance.’ Instances can also include material types if I want the materials to change from one object to another. Also, when creating windows with mullions I may want to control the mullion width as a ‘type’, but the mullion offset from the window height and width as an ‘instance.’ That way when someone changes the height and width, (or type) of the window, the mullion offset can adjust according to a formula. Did I grasp this clear enough?
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Joined: Thu, Nov 10, 2005
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Yes, seems like you got a pretty good grasp on it now. The only thing is, is when you dimension and add a parameter make sure the dimension is going to refrence planes that the model is attached/locked to. DO NOT dimension and and a paramter when the dimension is just dimensioning to lines of the object, your family will not always work if you do that.
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Joined: Wed, Aug 22, 2007
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Yeah, I’ve got a handle on aligning and locking the dimension to the appropriate reference plane. Thank you so much for your quick and great explanation. I need as much confidence with Revit as I can get.
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