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    This has been an issue in the use of Revit for quite some time. I and others have questions like:
    • Why is there a category for Nurse Call Devices but not for numerous other needs?
    • Why can we not control what categories or instances we need to be cuttable?
    • Why do even cuttable categories work differently in various categories?
    • Why so much variation between the family categories in their ability to display?
    • Why does sharing a family change the rules of how it displays?
    • How are we to even know all the different results possible from each category?
    • Why does it need to be impossible to utilize the categories given to successfully complete a complex project?
    This all comes together to ask the biggest and most crucial question:
    If we are using BIM to create a virtual building to better the process and understanding of the components of the building, then why can we not trust the representation depicted in the families based on the preconceived determination of how different families are shown. Should they not all be a true section of the components wherever you are cutting them? If not, then the process is faulty and prone to error.
    So, lets take this issue to an example of work I am doing for a current project. We have terracotta and other materials that we want to panelize on the building but we want to see the actual cut through the material. If I have a thicker piece of terracotta than the others, as shown in the example below, then in most cases that piece will mask the piece being cut. These are all nested pieces of terracotta placed into the panel family of the same category so that they can be scheduled as their pieces as well as the whole panel.

    So with this piece, lets look at some various categories that could be used for this.
    Click Image to Open PDF
    Here is a closer look at the two categories that are the closest to the true need of being truely cuttable.

    The results are that the only category that can be trusted (other than some structural categories) is columns as long as you uncheck the show precut in plan option. Generic model works until you share the nested components and a non-cuttable family like furniture will almost work when you share the nested components as it will show a representation of the actual nested component but will not actually cut it. So, because of how Revit is designed it leaves you between a rock and a hard place with the decision of what odd category should be used to represent what you need.
    Anyone else have any thoughts or suggestions?

    Click here to view the entire blog post.

    Good post here!!! :thumbsup:
    -Alex Cunningham


      Thanks Alex.

      Been now wondering if you create an entire project using the architectural column category, would it be detrimental to the performance. Just a thought...

      BIM Manager
      Adaptive Practice Blog
      [email protected]


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