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Thread: Difference between nurbs,Polygon tris,subdivision

  1. #1
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    Difference between nurbs,Polygon tris,subdivision

    Hi everyone,
    i am new here.
    I want to know,when i create a house with all accessories and many different family in revit,
    what is the geometry of my house.
    I was selling my model to my client,but he asked me what is the geometry of the model.I don't understand him.
    please help me if you know what it means.
    Thank you.

  2. #2
    Member d.stairmand's Avatar
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    Best to just man up & ask the guy what he means!
    "Geometry of the Model" can mean many different things

    Just ask him, and if you do get an answer - please let us know of the outcome

  3. #3
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    Quote Originally Posted by d.stairmand View Post
    Best to just man up & ask the guy what he means!
    "Geometry of the Model" can mean many different things

    Just ask him, and if you do get an answer - please let us know of the outcome


    he said,is it nurbs,polygon tris or subdivision

  4. #4
    Moderator DaveP's Avatar
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    Maybe a better question to ask is why do they want to know and what do they intend to do with this information?
    Internally, Revit is...Revit. There's really nothing you can do with a Revit model other that use it in Revit, or export it to some other format.
    Depending on how you export it you can get a file with varying formats. I'm not familiar with your other options, but I do not think you can get a nurbs file out of Revit.
    Nurbs stands for Non-Uniform Rational Basis Spline which while it can represent a straight line or flat surface, more often is used for "wavy" forms - which Revit doesn't do very well.

  5. #5
    Forum Addict elton williams's Avatar
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    Revit for the most part is a proprietary format SOLID modeller, whereas many other modelling softwares are SURFACE modellers and use geometry forms such as NURBS, T-splines, Sub-D etc. and allow for easy manipulation of vertices, edges, polygons etc.

    Revit has it's own version of verticies (points), edges, faces and forms available within the conceptual massing environment, however they are still using unique Revit formatting and won't convert / relate directly to other formats without external processes.

    Topography in Revit is it's own weird approximated & triangulated SURFACE thing.

    Exports from Revit (DWG,SAT,FBX etc) will usually result in either (always planar) quad or triangular faces of SOLID geometry having both a FRONT and BACK face (excluding topo). Curved surfaces of any Revit geometry will also triangulate upon export. This is often annoying to others (such as image renderers or facade engineers) as file size can be quite large and difficult to work with in their own chosen software.

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