& Construction
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Integrated BIM tools, including Revit, AutoCAD, and Civil 3D
& Manufacturing
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Professional CAD/CAM tools built on Inventor and AutoCAD
Transcript
00:03
Curves can be used to extrude, sweep and revolve SubD shapes.
00:08
On the shelf, this Curve tool here is set to degree 1
00:12
and that will create straight line polygonal curves.
00:15
And so I can trace this roof shape, for example
00:18
and also specify the SubD layout at the same time.
00:23
So I'll use Extrude first and I'll double-click to open the options
00:27
and I'll need to make sure that the Pick type is set to Curves / Surfaces.
00:33
And then I just extrude with the manipulator
00:36
and the faces are created exactly where my curved segments were placed.
00:41
And the nice thing about Extrude is that I can just hit Extrude Again or space bar
00:45
and continue building up the roof shape.
00:49
And because these second and third extrusions were from the SubD edges,
00:53
they'll be welded together to create a smooth shape.
00:58
Now, I don't have to use a degree 1 curve. I could change the settings here
01:04
or I can use the curve tools on the palette.
01:08
And I like to use the Edit Point Curve which defaults to degree 3.
01:13
So if I want to do this hood, I can just place a start
01:16
and end point
01:18
and then pick and move the interior CVs.
01:21
And I'm going to give it a little bit of an extreme shape here.
01:25
So this time when I use Extrude on this curve
01:29
because it's a smooth curve, it's got to be rebuilt into flat divisions.
01:39
maybe four.
01:41
And then with this uniform mode,
01:43
initially, it's giving me equally spaced faces.
01:47
But because I've got more shape at the front of the curve here,
01:50
I can use this Curvature Bias slider to change
01:53
the spacing to give me a much better match.
01:56
And there's also a Parametric option
01:59
which takes the internal curve structure to define the face spacing.
02:04
But you do need to keep this option window open to make these changes.
02:08
There's no Query Edit History to reopen it
02:12
and there's also no history link with the curve either,
02:15
so changing the curve shape won't update the subdivision.
02:20
So I can have a look at the wheel arch curve now.
02:23
And I can use this Circle tool which defaults to degree 5
02:27
so I'll just take that and place it in the side view
02:30
and scale it up.
02:33
So that's a smooth curve.
02:34
But I can always decide later if I want to change
02:37
it to a polygonal curve by using the Control Panel here
02:40
to put the degree back to 1.
02:44
If I want to remove these lower segments,
02:47
then on the palette, I can use the Object Edit Detach tool
02:51
and use Ctrl-snap on this point and go
02:55
and the same on this one.
02:57
And that separates that part which I can then just delete.
03:03
So then I can move that out to where the wheel arch should be.
03:07
And then I'll just move these bottom CVs inwards a bit
03:12
and then I'll just close the palette
03:14
and I'll use Extrude again.
03:17
And here I have a choice of Normal or Global direction,
03:21
but I'll typically change this on the manipulator.
03:25
So if I switch to Normal here,
03:27
I can grow this SubD
03:29
out nicely from the curve
03:31
and then maybe just move it inwards a bit to create a wheel arch rim.
03:38
Now, if I have a look at the back here,
03:40
I've got some curves I can use with Sweep.
03:44
So I'll open Sweep and I'll start by selecting
03:47
the profile curve or curves here and then Done.
03:52
And then I'll select just a single rail to start with
03:56
and build it.
03:58
And because this was a smooth curve, then I need to choose how many divisions I want.
04:02
So maybe four.
04:05
And if I take a look in the top view,
04:07
you can see that the Parallel mode keeps the profile parallel
04:12
and Radial maintains the angle to the rail.
04:18
So I'll do a Next
04:19
and select this profile.
04:22
And this time I'll use two rails and I've got to be
04:25
careful to select the curve and not the SubD edge here.
04:29
And that then sweeps between those two rails.
04:34
Up at the front, I've got some tire curves that I can revolve
04:38
and I'll just do a Hide Unselected
04:41
and a Look At.
04:44
So this is a degree 3 curve with quite a detailed shape
04:48
and a pivot point here in the center.
04:51
So I'll just use the Revolve tool
04:54
and it defaults to the Z axis
04:57
so I can change that to Y.
04:59
And this Local Pivot setting here uses the curve pivot point as the revolve center.
05:05
So I could change that using Move Pivot before I revolve
05:10
or in my case,
05:11
I can use the Global option because the wheel is centered on the grid axes
05:18
and I've got a bit of zig-zagging here
05:20
so I can change any of these settings. So I'm gonna use the Curvature Bias
05:25
and I often find that just below one gives the best result
05:30
and you can have a look at the limit surfaces to refine that further.
05:35
So then I can do the other curve as well to complete the tire.
05:43
So curves are a useful way to get started with your initial SubD shapes.
00:03
Curves can be used to extrude, sweep and revolve SubD shapes.
00:08
On the shelf, this Curve tool here is set to degree 1
00:12
and that will create straight line polygonal curves.
00:15
And so I can trace this roof shape, for example
00:18
and also specify the SubD layout at the same time.
00:23
So I'll use Extrude first and I'll double-click to open the options
00:27
and I'll need to make sure that the Pick type is set to Curves / Surfaces.
00:33
And then I just extrude with the manipulator
00:36
and the faces are created exactly where my curved segments were placed.
00:41
And the nice thing about Extrude is that I can just hit Extrude Again or space bar
00:45
and continue building up the roof shape.
00:49
And because these second and third extrusions were from the SubD edges,
00:53
they'll be welded together to create a smooth shape.
00:58
Now, I don't have to use a degree 1 curve. I could change the settings here
01:04
or I can use the curve tools on the palette.
01:08
And I like to use the Edit Point Curve which defaults to degree 3.
01:13
So if I want to do this hood, I can just place a start
01:16
and end point
01:18
and then pick and move the interior CVs.
01:21
And I'm going to give it a little bit of an extreme shape here.
01:25
So this time when I use Extrude on this curve
01:29
because it's a smooth curve, it's got to be rebuilt into flat divisions.
01:39
maybe four.
01:41
And then with this uniform mode,
01:43
initially, it's giving me equally spaced faces.
01:47
But because I've got more shape at the front of the curve here,
01:50
I can use this Curvature Bias slider to change
01:53
the spacing to give me a much better match.
01:56
And there's also a Parametric option
01:59
which takes the internal curve structure to define the face spacing.
02:04
But you do need to keep this option window open to make these changes.
02:08
There's no Query Edit History to reopen it
02:12
and there's also no history link with the curve either,
02:15
so changing the curve shape won't update the subdivision.
02:20
So I can have a look at the wheel arch curve now.
02:23
And I can use this Circle tool which defaults to degree 5
02:27
so I'll just take that and place it in the side view
02:30
and scale it up.
02:33
So that's a smooth curve.
02:34
But I can always decide later if I want to change
02:37
it to a polygonal curve by using the Control Panel here
02:40
to put the degree back to 1.
02:44
If I want to remove these lower segments,
02:47
then on the palette, I can use the Object Edit Detach tool
02:51
and use Ctrl-snap on this point and go
02:55
and the same on this one.
02:57
And that separates that part which I can then just delete.
03:03
So then I can move that out to where the wheel arch should be.
03:07
And then I'll just move these bottom CVs inwards a bit
03:12
and then I'll just close the palette
03:14
and I'll use Extrude again.
03:17
And here I have a choice of Normal or Global direction,
03:21
but I'll typically change this on the manipulator.
03:25
So if I switch to Normal here,
03:27
I can grow this SubD
03:29
out nicely from the curve
03:31
and then maybe just move it inwards a bit to create a wheel arch rim.
03:38
Now, if I have a look at the back here,
03:40
I've got some curves I can use with Sweep.
03:44
So I'll open Sweep and I'll start by selecting
03:47
the profile curve or curves here and then Done.
03:52
And then I'll select just a single rail to start with
03:56
and build it.
03:58
And because this was a smooth curve, then I need to choose how many divisions I want.
04:02
So maybe four.
04:05
And if I take a look in the top view,
04:07
you can see that the Parallel mode keeps the profile parallel
04:12
and Radial maintains the angle to the rail.
04:18
So I'll do a Next
04:19
and select this profile.
04:22
And this time I'll use two rails and I've got to be
04:25
careful to select the curve and not the SubD edge here.
04:29
And that then sweeps between those two rails.
04:34
Up at the front, I've got some tire curves that I can revolve
04:38
and I'll just do a Hide Unselected
04:41
and a Look At.
04:44
So this is a degree 3 curve with quite a detailed shape
04:48
and a pivot point here in the center.
04:51
So I'll just use the Revolve tool
04:54
and it defaults to the Z axis
04:57
so I can change that to Y.
04:59
And this Local Pivot setting here uses the curve pivot point as the revolve center.
05:05
So I could change that using Move Pivot before I revolve
05:10
or in my case,
05:11
I can use the Global option because the wheel is centered on the grid axes
05:18
and I've got a bit of zig-zagging here
05:20
so I can change any of these settings. So I'm gonna use the Curvature Bias
05:25
and I often find that just below one gives the best result
05:30
and you can have a look at the limit surfaces to refine that further.
05:35
So then I can do the other curve as well to complete the tire.
05:43
So curves are a useful way to get started with your initial SubD shapes.
Required for course completion