- [Instructor] Often times, you end up with surfaces
that no longer have clean meeting conditions
across the boundaries.
This is an extreme case, just for demonstration purposes.
You can see there's a large gap.
If you'd made small modifications to the adjacent surfaces,
you may not have the continuity
required across those boundaries,
and to get those continuities back,
we use a tool called Match Surface.
With this, you select the edge you want to move
to the edge you want to move to,
and as soon as I do that, it moves that edge
to the adjacent surface.
Here you can see it's making its curvature continuous.
Now, also at the same time, I have this little information
that pops up, it says your surface is overconstrained.
The reason why it's overconstrained is this goes
all the way back to our continuities.
If I'm imposing a curvature continuity,
it requires a bit of math.
Well this is telling me that there's not enough math
on that surface, so as soon as I increase it,
I'll just click on it with my mouse button one.
It removes that information,
and shifted the surface slightly,
and the surface is now curvature continuous
across that boundary.
If I came in and said project endpoints,
it remembers where those endpoints were
from the initial surface, and it just projects them
over to that adjacent surface, so it doesn't necessarily
mean it has to run across the entire boundary,
and with that, I can now do some adjusting of that
across that edge as well.
You can just remove that, and it'll take it
all the way to those endpoints.
Even if that's not turned on,
I can still do those adjustments.
I'm going to select OK, and you'll notice the surface
is still there, there's no history here,
it's just adjusting the surface.
I'll do another match, and I want to take this,
now as soon as I pick this, you'll notice it says free.
I just came in and put in a curvature continuity across
this boundary.
If I don't come in here and right mouse click
and constrain that with curvature, it's going to move,
which we don't want to have happen,
so before I select the next surface, I constrain
that curvature continuity, I come to the next surface,
pick the edge I want to go to, and it goes and tries
to impose curvature on this side.
Now once again, I get that little information,
again, I don't have enough math across this surface
in order to meet the requirements of holding curvature
at both ends, so for that I have to increase,
you'll see the surface shifted a little bit,
and I have to do another increase.
Remember, if I want curvature at both ends,
at a minimum, I have to have a sixth order
or a fifth degree surface running in that direction.
And for that, once I get that, you'll see I no longer
have that information, its curvature across both ends,
and now my surface is U2, or perfectly smooth,
across those boundaries.
Select OK, and again note there's no history to this tool,
so if I were to make additional modifications to
this surface or this surface, I would have to go back there
and do the match once again.