- [Instructor] When working in sketches,
sometimes you want to take advantage
of construction geometry.
What is construction geometry?
So if you select any line or arc segment,
go over to the left,
you can see that it has an option here for construction.
What that essentially does is turn it from a solid line
to a dash line.
But what it also does is it exclude it from being used
in any features.
So what does this mean?
Here I have an extrusion and you can see its created by this
box and then a few holes inside of it.
If I accept this sketch we can see the various holes
that are inside of this.
If I go back into the sketch,
select some of these holes,
and then scroll down and change them to for construction.
I'm going to hit green for accept.
If I scroll in you can see now they have the dash lines.
This is going to take those holes out of that boss feature.
So I go ahead and accept you can see the features
are no longer there.
So when you are working with bosses sometimes you have the
ability to select contours.
So I can select the contour of that region.
You can see here that I can't select contours using
construction geometry.
So while that geometry might be good to have
in there for references,
I can dimension off that geometry or maybe if I'm using
convert entities and in an assembly or something like that
it can be very useful to have it in there but it's not
going to be able to be leverage
to create a feature for example.
So if I want to make a revolution or if I want to make a
cut or an extrusion the construction geometry is not going to
be able to be used to make those features.
It's also typically what you have when you have center lines
and things like that.
In our dropdown we have the center line option
that's not really a true center line or a midpoint line even
though you have the option to make it.
It's just a construction line that you can
create out in space.
So if you see here if I select this it just has
four construction just by deselecting that.
It's now a regular line entity.
So that's what construction geometry is.
It's just good to know the difference between that and
normal geometry.
And sometimes the features aren't showing up because
of your sketch.
You want to check and see if that's toggled on or off.