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Thread: Creating a simple precast family - not so simple!

  1.    #11
    Moderator Robin Deurloo's Avatar
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    Oh and was it Revit 2019 that started complaining about dimensions and parameters being attached to model data when you edit a family?
    So even Autodesk thinks it is a bad idea and they still think that importing dwg's is a good idea

  2.    #12
    Forum Co-Founder Twiceroadsfool's Avatar
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    It was 2018...
    Robin Deurloo likes this.

  3.    #13
    Moderator cellophane's Avatar
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    Quote Originally Posted by Steve_Stafford View Post
    Build the Bones (ref planes/lines), attach Muscle (dimensions/parameters) then add the Skin (solids/voids/lines).
    That is still my favorite analogy for building families!
    cganiere likes this.

  4.    #14
    Forum Co-Founder Alfredo Medina's Avatar
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    Quote Originally Posted by Dlowery View Post
    I sometimes wonder why there are so many techniques for this. I have seen plenty of videos that recommend NOT using reference planes, and currently, my family has none and it seems to work perfectly, not to mention it looks cleaner. I wonder if it's going to bite me later.
    "Plenty of videos that recommend NOT using reference planes?" Where have you been studying about families? It makes a difference what resources you use.

  5.    #15
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    Quote Originally Posted by Alfredo Medina View Post
    "Plenty of videos that recommend NOT using reference planes?" Where have you been studying about families? It makes a difference what resources you use.
    I have seen Revit families that dimension directly to the extrusion lines in sketch mode. And when I have tried it, it seemed to work well. In fact the only reason I use reference planes/lines now is because everyone says to do so.

    Either way, my real problem still persists. I have not created the family I want yet...

    People have said on here to use assemblies, but I need to have a parameter for unit volume and weight that goes in a schedule, and I am not sure if I can do that since there are multiple units in the assembly.

    What I really want is to have one family with multiple component ends so that I can stretch each dropstem to a reference plane. As it is now, I can snap the component end onto a line or plane, but that's just for the main part of the beam, and that gets cut off anyway. So, all I have to control the dropstems is shape handles, and I cannot stretch them and get them to snap onto a point, which is what need to happen. If I could only figure out a way to get a shape handle to snap to something...
    Attached Thumbnails Attached Thumbnails Creating a simple precast family - not so simple!-5.jpg  

  6.    #16
    Mr. Revit OpEd
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    Revit is pretty tolerant of varying techniques for constraining solids/voids. The last few releases have started generating warnings when ill advised constraints exist.

    For each separate form you want to control separately you need a unique parameter (instance to have grips) and a unique Reference Plane or Line assigned to at least Weak or Strong (preset names like Right Left are strong). The preset names allow for dimensions to "jump" from reference to reference. An example is a door family where you apply a dimension to the centerline but can click on the dimension blue dot on the witness line and have the witness line jump to a side...repeat and it jumps to the other side...repeat it returns to center.

    I show in a blog post how a Reference Line and Reference Plane are different as they apply to the display of grips.
    cellophane likes this.

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