BIM_SIG_034 Special Interest Group November 2013

In this session the attendees wanted to look at section viewports, using the clip cube to make section viewports, how to move section markers, and how to use class overrides in viewports. For this session I used to three-story building that I have used previously.

These topics are extremely useful to get right, especially understanding how the section and section markers work, and understanding correctly how class overrides and viewports should be used.

Topics covered:

  • using the clip cube preference
  • using the Clip Cube quick preference
  • moving the clip cube
  • using the clip cube to create a Section Viewport
  • Section Viewport dialog box
  • editing the layers on the Section Viewport dialog box
  • understanding the Section Viewport settings
  • Section Line Instances…
  • moving the section line instances
  • using a reference plan to create section viewports
  • editing the section by editing the section makers in the viewport annotations
  • editing the section line instances with the reshape tool
  • controlling the section line instances
  • save the clip cube with a saved view
  • you can do most of your work in 3D now with the clip cube
  • class overrides in viewports
  • using class overrides on the section style class
  • embedded design layer viewport settings only affects viewports that have Design Layer Viewports on them
  • controlling line weights of objects beyond the section plane
  • creating a special class to control line weights of objects in elevation
  • controlling the graphics on the roof using class overrides
  • ensure object are using class attributes
  • removing areas of slab for stairs
  • finding errors in the slab cutout
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6 thoughts on “BIM_SIG_034 Special Interest Group November 2013

  1. Hi Jonatahan,
    we saw that it’s possible to change the appearance of lines belonging to sections, editing class style with class overrides. But my question is:
    is there a way to assign different lines of a section to different classes? I mean: it’s not desirable that glasses of windows, for example, have the same thickness than the edges of walls. In the same way I control them in plants using different classes how can I do in sections?
    Thanks again for your work!!

    • If I understand you correctly, you want to change the assignment of objects in the section. The answer is that this is not possible. You have to create your objects in the design layer with the correct class is assigned. But in the example you give, it is easy to create different classes for the components of the window, so that the frame of the window has a different class than the glass. Once you have created the objects with the correct classes then it is possible to go to the section viewport and use class overrides to control the line weight of the objects.

  2. What I wanted to do is assign different line weights to different objects that have been cut by the section plane. So, what you suggested me is to assign different classes to various objects during the drawing. But that only works for objects beyond the section plane. What I found out looking in advanced properties of section is the possibility to create a MERGED CROSS SECTION and assign two different classes for STRUCTURAL and NON STRUCTURAL objects. I wished I could assign more than two classes to objects in the section plane, but that is a good beginning.
    I wished I explained clearly enough,

    • then use the class overrides. The movie shows you the easiest way to do it, but you can also use the original classes of the objects and then use the normal class overrides on on a viewport

  3. Hello Jonathan,

    I am working with a skewed floor plan so when you take a section or elevation viewport only a portion of it shows as “perpendicular” to the sheet. Is it possible to create a “polygon” section cut so that you can always keep the view perpendicular to the page?


    • Sorry, no. But what you can do is to create two sections, one for each part of the plan, then join the two viewports on the sheet layer.

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