Revit: Family Curves and Formulas
Illustration by Richard Downs

Revit: Family Curves and Formulas

with Paul F. Aubin

Video: Creating the framework for a Gothic-style arch

So let's continue our exploration of various arch And the one called back, I'm going to rename as top.
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  1. 5m 3s
    1. Welcome
      1m 21s
    2. What you should know before watching this course
      1m 36s
    3. Using the exercise files
    4. Units of measurement used in this course
      1m 16s
  2. 42m 42s
    1. Creating seed families
      8m 22s
    2. Understanding automatic sketch dimensions
      7m 43s
    3. Creating circles
      7m 44s
    4. Creating ellipses
      5m 18s
    5. Constraining simple open curves
      9m 8s
    6. Using arc angles and radius
      4m 27s
  3. 25m 56s
    1. Controlling rotation
      7m 39s
    2. Creating a door swing
      5m 12s
    3. Adding geometry to work planes
      6m 32s
    4. Rotating a curve
      6m 33s
  4. 32m 6s
    1. Working with segmental arches
      9m 29s
    2. Creating Roman- and Moorish-style arches
      3m 26s
    3. Creating the framework for a Gothic-style arch
      3m 35s
    4. Making a Gothic arch
      7m 50s
    5. Making elliptical arches
      7m 46s
  5. 36m 35s
    1. Introducing formulas
      7m 16s
    2. Using profile families
      5m 53s
    3. Devising the strategy for ovolo curves
      4m 31s
    4. Building an ovolo profile
      11m 22s
    5. Using an ovolo profile to shape a sweep
      7m 33s
  6. 16m 34s
    1. Understanding cyma curves
      4m 58s
    2. Building profile references for a cyma curve
      5m 38s
    3. Building a cyma profile family
      5m 58s
  7. 38m 21s
    1. Using fixed proportion and scaling
      6m 19s
    2. Leveraging equality dimensions
      6m 51s
    3. Understanding splines and fixed proportions
      8m 49s
    4. Incorporating variable proportions
      8m 4s
    5. Combining scale and proportion
      8m 18s
  8. 33m 26s
    1. Creating a three-center arch
      5m 52s
    2. Using a profile to make a door opening
      6m 37s
    3. Creating a profile-based door panel
      4m 54s
    4. Configuring molding profiles
      6m 26s
    5. Creating door molding sweeps
      9m 37s
  9. 1m 6s
    1. Next steps
      1m 6s

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Watch the Online Video Course Revit: Family Curves and Formulas
3h 51m Intermediate Mar 20, 2014

Viewers: in countries Watching now:

Have you ever tried to control the shape of a curved form in the Family Editor? If so, you know that flexing them sometimes throws you a curve ball. In this course, Paul F. Aubin explores several techniques to tame your unruly parametric curves. This includes examples of circles, arcs, arches, splines, and even complex curves like cyma moldings. The real power comes in with formulas, profile families, and proportions, which allow you to mathematically control your curves. At the end of this course, we can't guarantee you'll never have misbehaving curves, but we'll give you several useful tools to help tame them.

Topics include:
  • Creating seed families
  • Creating circles, ellipses, and arcs
  • Controlling rotation
  • Working with segmental and elliptical arches
  • Using profile families
  • Working with cyma curves
  • Using fixed proportion and scaling
Revit Architecture Revit Structure Revit MEP
Paul F. Aubin

Creating the framework for a Gothic-style arch

So let's continue our exploration of various arch shapes, and move on to a Gothic arch. So the challenge here is that at the top of the Gothic arch, it has to come to a point, so we can't use just a single curve in this case. We're actually going to need two curves. However, don't let that fool you it's really basically the same approach that we've just completed in the previous two movies. In other words, if we look carefully at the Gothic arch it's basically two segmental arches, at an angle, that are touching one another to make that point at the top.

So let's take a look at that. So I'm back in the Face Based seed family, and this is in the Seed Families folder with the exercise files, and its back to the original version of it, so you'd want to do a save as to create your Gothic arch. Next, I want to make a few changes, like we had done previously, so that the basic set up is going to be similar to the segmental arch approach that we took a few movies ago. So I'm going to delete the front reference plane here, and I'm going to rename a couple of these. So the center front back, I'm going to rename as spring line.

And the one called back, I'm going to rename as top. I'm going to take this dimension and I'm going to label it with the H dimension to make that the height. Now these dimensions here, I want to take both of those and just sort of drag those up a little bit to get them out of the way. And then I'm going to take the height and I'm going to flex that to about two. So I now have a square in here but really what I want to think about is the diagonal from this point right here down to this point right here.

And I essentially want to create two diagonal arches, two segmental arches. So we're going to borrow some techniques that we've done in some of the previous movies. The first is to use a reference line to create the structure for this arch. So I'm going to click on the Reference Line tool. I'm going to start right here at the intersection of spring line and left. Snap to that. Snap to the center and top intersection, and then back down here to the right and spring line intersection.

Cancel out of there, and we get a bunch of automatic sketch dimensions that appear. So to get rid of those, we'll just align and lock. There's going to be several of these, so be patient. Remember, it's always reference plane to point, reference plane, end point, lock. Reference plane, endpoint, lock. And you keep doing this until you either get this error, or until all of the blue automatic sketch dimensions go away. So if I get this error that's fine, I'll just click cancel. That means I'm good in that direction, but I still need to go in this direction.

Right? And see if I do it again, because I have two touching end points there, I may or may not get that error there. So in this case I'm fine, did it in both directions and in this one in both directions. So sometimes it'll display that error, because it automatically is associated with some other object, it's fine don't panic, just click to cancel and keep going. So now at this point, you know, if I just want to test this out real quick. You know, if I flex, that's what I'm looking for. Is I want this triangle to adjust when things flex, okay? And if we flex it in this direction, you'll see it stays a triangle, and it stays attached at those points.

And that's what I'm looking for. So we've got the basic framework working for our Gothic arch and we're ready to start building the geometry. And that task we will save for the next movie.

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