Features in Civil 3D 2015 - Assembly Frequency

Zen Admin
Zen Admin

by Graham Riddleston

When designing corridors in Civil 3D one of the most important controls available to the engineer is the frequency at which the assemblies are applied. If you set an interval too small the corridor will take longer to process and look cluttered but if the interval is too large, curves will appear with ‘jagged’ edges:

In designs that contain a variety of curve sizes the assembly frequency might be set correctly for small radii and junction designs but might be too close for larger curves:

In earlier versions of Civil 3D frequencies could be set manually on a curve by curve basis but this was a time consuming exercise.

Now in Civil 3D 2015 a new feature is available which allows the assembly frequency to be set by Curvature Value (i.e. a Mid Ordinate distance). This is in addition to the traditional fixed interval method (or a combination of both can also be used):

This means that by using a single setting (I used a curvature value of 0.02m and 10m interval on straights and transitions I can achieve suitable assembly frequencies for all the curves in my design.


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  • Comment author
    Kevin Barnett

    but what does 0.02 in "BY CURVATURE" mean? Would be great to see a diagram showing the 0.02.

  • Comment author
    Graham Riddleston

    Hi Kevin,
    Thanks for your question. I've just written a white paper to help explain assembly frequencies in a bit more detail. Hope it helps


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