Tuesday, January 23, 2018

Data Mining Your Revit Model

Data Mining Your Revit Model

 
Revit is Database software that uses graphics and geometry as part of its system.  This leads to a very data rich model file.  There are a variety of different ways to get useful data from the Revit Model.  Revit can automatically schedule many elements of the model.  Revit can also do material take-offs of most elements that exist in the model.  Furthermore, Revit is also able to get useful information from reportable model data that doesn’t actually exist in the model.
 
There is information in the model that can be translated to provide different information that is useful to the manufacturer. For example; if I have the perimeter of a Curtain Wall Panel, then I can use that information to figure the length of gasket material or amount of adhesion material, and so on.  If we know how many fasteners it takes for the different mullion types and assemblies, we can add a parameter to include X amount of fasteners to each of the types. That information would only need to be added per type.  Then we can Schedule that information in the Curtain Wall Mullion Schedule.
 
Curtain Wall Panel take-offs do not automatically give perimeter information.  The following demonstrates how to mine your Revit model for useful information.  In this case we schedule the perimeter of the curtain wall panels.
 
Using Revit 2016 (This can also be done in earlier and later versions of Revit. Different year releases might not look identical.)
 
Step One
Click “View” then “Scheduled” then “Material Takeoff”.
 

 
Step Two
Select “Curtain Panels” from the “Category “ list.
 
 
 
Select “OK”
 
Step Three
Add the fields that you want to schedule.  Be sure to include “Height” and “Width”.  You will need them later to get the perimeter.  The “Family” and “Material Area” will also be useful for keeping track of types and ordering material.
 
 
 
Step Four
Select “Calculated Value”.  Name it “Perimeter”.  Set Discipline to “Common”, and Type to “Length”.
 
 
 
In the “Formula” area click the "three dot" button.   There you will see the parameters that can be used in a formula and are in the current scheduled fields.  First choose “Height” or “Width”.  Then choose the other. You can pick one at a time or just type in the formula by hand.  Be sure to match the text exactly or Revit won’t recognize it.  To get the perimeter you can use a few different formulas that will get the same result.  I use (Width + Height) * 2.  These formulas work like an Excel formula.


 
 
Edit the “Formula” field to show the calculation that you want.
 
 
                   
Select “OK.”
 
Step Five
Once the fields are set, it’s time to determine how to show the desired data.  Sorting helps to arrange the data in a very useful spreadsheet layout.  Select the Sorting/Grouping tab to arrange the data for the spreadsheet.  Under the "Sort by:" pull down menu select Family and select the options you would like to use.  It is important to check the box for “Footer” and “Grand Totals”.  Whether everything needs itemized or not is up to you.

 
Step Six
Select  Formatting.” Be sure to check the “Calculate Totals” box at the bottom, for fields that you want the material length or area for.

 

 
Bonus Step
Sometimes we need lengths or areas in a different unit of measure for special circumstances.  Revit can easily deliver the information that you need in any of the formats that you see in the image below.  In the “Field Format” you can get this information in either Imperial or Metric.
 
 
 
Scheduling these factors is very useful for the folks involved in the project.  Area can be used for ordering material like glazing or coatings. Width can be used to find the longest span for the structural folks. Perimeter can be used for ordering material like gaskets or adhesion material.   

 
 

 
Once we think through the list of data that our manufacturers may need we can come up with a way to mine that information from our Revit “Database” Model.  We can get most of what we need from Scheduling the Curtain Wall Panels or Mullions.
 
I invite your questions or comments.

2 comments:

  1. Hi,
    Is there any way to add parameters to Curtain wall mullions? For example, a text parameter to indicate some small technical detail? Or a yes/no parameter that says if the mullion needs to be ordered from a specific manufacturer?
    Thanks for your help!

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  2. Yes. There are ways to do what you are asking about. I think to get those things to be schedulable, you have to be carful of where you put the information and how much you try to do with one family. If you make different family files with the differing Parameter information, it should work. I think that if you try to make one or a few families that try to do it all; then it won't work well. The risk is when we try to make a magic set of parameters or one element that can do many things. Keep each family as simple as possible. The problems come when we try to do too much. One little thing wrong and the program wont even let you load the family, Curtain Wall components are very sensitive.

    These things can be done.

    Regards

    Nardo

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