- [Instructor] Sometimes once you create one sketch,
you want to replicate that same sketch on different faces
and maintain a relationship between them.
You can do this using a derived sketch.
Now, how you do that is
I'm first going to just make a random sketch on this face.
I'm going to make a little spline
with a little circle on the end.
Go ahead and click OK, and we've created that sketch.
And, like all the other sketches,
we can move it around in different positions,
scale it up and down,
do all kinds of stuff with this sketch.
Once we have that created,
I'm going to pick that sketch,
select this face over here while holding Ctrl.
Then, I'm going to go up to the Insert tab,
and down here we'll see that Derived Sketch
is now available.
I'm going to click on that,
and you'll see that another sketch has appeared
behind the original one that I created,
those two are now linked together.
I'm going to ahead and accept that sketch.
Now, you can see if I grab this and change this sketch
by dragging out this circle, for example,
it also updates.
If I select the entire sketch and move it up or down,
the sketch stays with it.
Also, if I scaled the sketch, it also maintains that scale,
so it's an exact replica of this sketch just on that plane.
Now, you don't have to do it in a plane that's parallel.
You can also do it in other planes.
I'm going to select that same sketch, select this face,
and, now, I'm going to go to Insert and hit Derived Sketch,
and, now, you can see I've got it in this direction,
and they're all based on the relative zero of those faces.
So I'm going to go ahead and hit accept,
and, again, I'm going to take this sketch,
and I'm going to move it.
And you can see as I move that sketch,
this sketch moves with it,
but also the one that I created on this face
moves to the left as well.
You can see that this is a pretty powerful tool
and gives you the ability
to link together a lot of things at once.
If you're working on, for example, a hull pattern
that needs to be matched across multiple parts,
you can create a derived sketch to do that.
If you want to handle some kind of change in dimension
as you drag one thing from one spot to another,
like we did here,
that can also be controlled by derived sketch.
Now, you can see it's probably not useful all of the time
in your day-to-day modeling,
but when you have those very specific
and advanced kinds of geometry,
this is going to be a very powerful tool
that you can use.