- [Instructor] Here we're going to discuss shell.
Shell's a very powerful tool in that it allows you to create
and sculpt one side of a model, and then,
by selecting faces on the opposite side,
the system will carve out to a continuous thickness
to the inside or the outside depending on how
you designed your part the value that you specify.
So there I have a two millimeter thick wall going
throughout the entire part.
You'll notice the wall that I selected is
the one that disappears.
So to make a modification I can either double-click
the shell in the tree, or in this case
because this an inside thickness,
I can double-click inside of the shell.
I can select additional faces to shell out as well.
Now I'm going to come back up to just before the shell,
I'm going to right mouse click on the pocket,
the final work object, and what I'm going
to do is I'm going to add in a couple
of fillets here and up here as well.
The reason why I'm doing this is so you can see that when
I come back down to the shell, right mouse click,
define a work object, all those tangent faces are selected.
Very similar to how the draft works.
Very similar to how the edge fillet worked.
If you have tangent-propagated faces
the system will automatically go through
and pick all of your tangent-propagated faces.
Now with the shell, double-click on it once again,
I'm going to go ahead and apply an outside thickness.
So I can go to the outside, come back in,
say zero to the inside thickness, and what's going
to happen is this going to grow from here out.
So there are times that you actually design a volume.
I've seen in the past where
your creating a specific amount of volume.
I need to carry a gallon of water.
So you design to a gallon, and then you do your shell
to the outside that way you have the proper volume
to the inside of your part,
and that's why you would use an outside shell.
It's a very handy tool.
Other things that you can do with a shell,
is you can have other thicknesses on faces.
So to do that, I'm going to go ahead and remove
these two edge fillets, and as you see
this is now default thickness to the outside.
Double-click on it.
I'm going to go ahead and make this two to the inside,
zero to the outside,
and other thickness faces allows me to pick a face.
In this case, I'll pick this face.
You'll notice it's a different color indicating that
it's going to be a different thickness.
As you do that you'll have multiple parameters set up.
This parameter is to the inside,
this parameter is to the outside.
It's a little tricky to tell the difference,
but currently I only have a two and a zero,
and I know that that two is to the inside
because those are the only parameters that I have available.
So when I double-click on this parameter,
remember if you see a value out on the screen
you can always double-click on it.
You can double-click on that value,
enter in the value that you want, select okay,
and now at this point you'll see the rest of
the model is at two millimeters,
and that other thickness face is at five millimeters.
So if you are creating an injection molded part,
creating a part with various thicknesses,
you can go in there and with one shell
generate various thicknesses based off the one shell.
One of the areas that I get confused at is when
you have tangent edges as such.
Doesn't necessarily like to break the tangencies.
It's also good modeling practice to not try
to break a tangency with a shell.
It's better to apply your shell to
the sharp edges when you're varying the thicknesses,
and then come back and apply your edge fillets to get
the appropriate edge fillet appropriate thickness.
The appropriate types of control on your part.
So order of operations is pretty important,
and you just want to make sure that if
you're varying thicknesses that you try
to have sharp edges that your varying thicknesses up to.