- [Instructor] One very important technique to remember
is that when you're building anything class A style,
you need to overbuild your primary slabs.
You basically have primaries,
these big overbuilt slabs,
secondaries, which are the blends that run in between
those slabs, and then tertiary surfaces like these corners.
These are typically your smallest corners.
And as we build things, we want to make sure that these slabs,
these patches, the layout of these things,
encompasses as much of the part cleanly
to give us nice, smooth primary slabs.
Something that looks good, has a nice touch to it as well.
When we build our secondaries,
these, we basically are taking the math
from this surface, the math from this surface,
creating that blend.
So this blend is going to be a result of the complexity
from these two surfaces.
So that's why it's important to use as simple the math
as possible for these primary slabs.
So when you're laying out your primary patches
and you're looking at the part,
it's very important to, again, try to capture as much
of the intent in your primaries as you can,
notice where the accelerations happen,
and then start laying out your secondaries.
Now, as your secondaries start forming these corners,
these tertiary surfaces are going to be the result.
As you can see in this case, we have these three blends,
and this primary slab.
These are typically going to be the most complex surfaces.
They're also the smallest surfaces.
So you want to make sure that the more complex surfaces,
the greater the transitions.
Those happen as you get into more of the granular detail
of your parts.
So make sure your primaries are primaries,
make sure your blends are blends,
make sure your tertiaries are tertiaries.
You don't want to try to build this all
with one big, giant surface.
You'll never get it to look good.
It'll have all sorts of crazy, wild undulations.
So your primary slabs need to break up the part
into its constituent components,
and then again, bring everything together using blends
and tertiary surfaces.