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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.
We've talked about creating seed families quite a bit in the course so far. And in the last movie we created a segmental arch. Well once you have a segmental arch, it could actually become the seed for other shapes of arches. So the segmental could easily become a Roman arch or a Moorish arch just by varying the parameters inside that file. So, in this movie, let's take a look at how we can do that. So, I've got a file here called Segmental and it's just the endpoint from where we left off in the end of the last movie.
What we can do is take this and save it as and give it a name as either Roman or Moorish and then just simply vary the settings. So you can do a save as, as a family. Put it on my desktop. I'll call it Roman. And now all I have to do is go to family types and I'll flex it first. So I'm going to take the height, and I'll make it 1, because the width is 2. Let's apply that. In order to get a Roman arch you just need the height to be half the width. Now if you just want to ensure that it stays that way, we can put a formula over here.
So I'm going to take the formula column next to h, and simply put in w divided by 2. You could just as easily put a formula here. H times 2, but don't put both. So, it's really up to you. They're both going to do the same thing. H times 2, that's just the star key. Either one will do the trick. And now, if you apply that, nothing will change, because I haven't changed the numbers, let's try a different number. Let's try 3 for the width, click apply, notice that will make the height 1 in a half.
Try .75 for the height, click apply, that'll make the width 1 in a half, and so, they really can't get out of sync because of the formula, and again, whether you put the height times 2, or the width divided by 2, you'll get the same result. So that gives you your Roman arch. If you save it again, for your moorish example, now the trick is to make sure that the height is actually larger than the width. So if you make it larger, what'll start to happen is it will push it up above that top point where we're at right now.
And it will start to make the arch sort of bulge out a little bit. So let me remove the formula and let me take the height here and I'm going to make that 2 and click apply. And do you see how that starts to balloon the arch out. Now 2 is probably getting to be close to the upper limit. At some point this might fail, if you put in numbers that are too extreme. Because, you have to remember that at some point it still needs to create an arc. So, we're still working within the limitations of a circle here. So, you know, if you put in 17 here, I doubt that that would work.
But, you have to, you know, kind of keep that in mind. But, if you want to, you could actually build a formula to describe what proportion you are after. So if you had a certain proportion in mind between the width and the height then you can put that in the formula. Again using either division or multiplication. But in this case I'm just going to sort of flex it manually here. So what about 1.75? You can see that it makes it a little shallower but you get the general idea. So if we make the height larger than the width we get a moorish shape.
If we make the height less than the width, we get a segmental. If we make it exactly half, we get a Roman arch. So, one single approach, one single family, can actually become three very different shapes of arches.
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