Extrude faces in Alias

00:03

In a previous video, we were extruding from curves.

00:07

And this pick type setting is important because if

00:10

I now select here on this wheel arch,

00:13

you can see that it's picked the limit surfaces

00:15

instead of the control cage edges.

00:18

And I don't get the result that I want.

00:21

So undo that

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and then if I change the pick type here to Edges, this time,

00:26

it picks the control cage edges as I wanted

00:29

and extrudes as I'd expect.

00:33

Now All would seem like a good general setting.

00:36

But what happens is you tend to end up having the Pick Chooser always popping up

00:40

for the surface, the edge or the face and this becomes a bit inefficient.

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So one of the best ways to work is to close Extrude

00:50

and then pick the objects and turn on the controls display

00:54

and then use the Pick tool, so I'll do edge loops here,

00:58

because when I then go to the Extrude tool,

01:01

the option gets automatically set correctly

01:04

and then I can do the extrude.

01:09

So if we now have a look at the roof

01:11

this time, I'll start with the tool and set it to Edges.

01:15

But note that it's not edge loops. So the first click will turn the controls on,

01:19

but then I have to select edge by edge.

01:23

But I can use Shift to select the last edge with my Add

01:26

mouse button

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to pick the whole edge loop.

01:29

So that Add mouse button is whatever you've got set to Add in the Selection Options.

01:35

And the default is the middle mouse button,

01:37

but you may have them set differently, so make sure you check that.

01:41

Then I can do the extrude.

01:43

And I'm gonna have a look at these two options.

01:47

Weld Together refers to in-between the new faces.

01:51

So these are welded together and smooth.

01:54

So if I turn that off, you can see that now the edges aren't welded.

01:58

So you're almost always going to keep that on.

02:02

But also the new extrude is welded to the original, so it's a smooth connection.

02:07

But if you turn on Edges As New Bodies, then it gets created as a new separate SubD.

02:14

But you need to be careful that when you do the next extrude, that you take that off

02:18

if you want them to continue being connected.

02:24

And the tip here is that if you make a mistake with the manipulator like this,

02:28

you can't just undo the transform.

02:31

Instead, the last extrude gets undone and you get taken out of the tool.

02:38

You can also extrude from faces.

02:40

So if we have a look at this sat nav shape

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it tends to work well on closed forms like this.

02:46

So I can pick these two central faces

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and then like before the Extrude

02:51

tool automatically switches

02:52

to whatever I've got selected, so in this case faces.

02:57

So what happens is that those faces get moved

02:60

and their new faces are added in the gap that's created.

03:04

So I can shrink that down and quite easily create a protrusion for the antenna.

03:13

But if we have a look at the hood,

03:14

this is built in one half with an open edge here on the center line.

03:19

So if I want to create a hood scoop

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then I can pick these three faces

03:24

and just raise that up a bit.

03:27

But then when I shade the limit surfaces, it looks a bit strange round here.

03:32

But you can see why in box mode because

03:34

it's just created these extra faces on the inside.

03:37

And I can just delete those,

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but I can't select because the vertex display was

03:42

only temporary whilst the extrude tool is active.

03:45

So I need to pick the object and display the vertices

03:47

first and then I can just pick and delete those faces.