& 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
00:01
The Skin tool has this Crown Mode option,
00:04
and this becomes available once we've built the skin surface.
00:08
If I turn on the CVs,
00:10
you can see that a default skin creates a straight line ruled surface.
00:15
But when I add some crown, I get this extra row of CV S in the middle
00:19
which creates this arc shape.
00:22
And I can work with this either in the model
00:24
window by flipping the crown or adjusting the value of it
00:30
or over here in the control window.
00:33
And here I've also got a Crown Position slider
00:36
and this will adjust the position of that center row
00:38
of CVs to nudge the shape up or down.
00:42
And to explain Proportional and Absolute,
00:45
I'm gonna switch to this simpler example here.
00:48
If we use Proportional, then this crown value determines a crown height,
00:53
that's always going to be a proportion of the width of the skin surface
00:58
With Absolute, that crown value is just the distance in model units.
01:03
So here I've just got exactly five mm
01:05
for the height.
01:08
But this really only makes a difference
01:10
if the width of the skin varies along its length.
01:16
So here you can see the Proportional is
01:18
maintaining a more consistent cross section shape.
01:25
So finally, I'll have a look at this roof surface
01:28
and
01:29
I'll apply some crown.
01:33
And, it may be that I don't want this pure arc shape.
01:37
And so here I have the Crown Shape value, and as soon as it goes away from one,
01:42
you can see that it creates
01:44
an extra row of CVs to create a degree-3 surface
01:47
and I can change the position of those CVs.
01:50
And that allows me to create a more peaky surface
01:54
or one with the curvature pushed outwards,
01:56
which is more typical for an automotive centerline surface.
02:00
And if I type a value of 1
02:02
and I get that back to a degree-2 surface.
02:05
Now, the Freeform Blend tool when it's set to Position and to Position
02:10
also has the option of this Crown Mode and it works in exactly the same way.
00:01
The Skin tool has this Crown Mode option,
00:04
and this becomes available once we've built the skin surface.
00:08
If I turn on the CVs,
00:10
you can see that a default skin creates a straight line ruled surface.
00:15
But when I add some crown, I get this extra row of CV S in the middle
00:19
which creates this arc shape.
00:22
And I can work with this either in the model
00:24
window by flipping the crown or adjusting the value of it
00:30
or over here in the control window.
00:33
And here I've also got a Crown Position slider
00:36
and this will adjust the position of that center row
00:38
of CVs to nudge the shape up or down.
00:42
And to explain Proportional and Absolute,
00:45
I'm gonna switch to this simpler example here.
00:48
If we use Proportional, then this crown value determines a crown height,
00:53
that's always going to be a proportion of the width of the skin surface
00:58
With Absolute, that crown value is just the distance in model units.
01:03
So here I've just got exactly five mm
01:05
for the height.
01:08
But this really only makes a difference
01:10
if the width of the skin varies along its length.
01:16
So here you can see the Proportional is
01:18
maintaining a more consistent cross section shape.
01:25
So finally, I'll have a look at this roof surface
01:28
and
01:29
I'll apply some crown.
01:33
And, it may be that I don't want this pure arc shape.
01:37
And so here I have the Crown Shape value, and as soon as it goes away from one,
01:42
you can see that it creates
01:44
an extra row of CVs to create a degree-3 surface
01:47
and I can change the position of those CVs.
01:50
And that allows me to create a more peaky surface
01:54
or one with the curvature pushed outwards,
01:56
which is more typical for an automotive centerline surface.
02:00
And if I type a value of 1
02:02
and I get that back to a degree-2 surface.
02:05
Now, the Freeform Blend tool when it's set to Position and to Position
02:10
also has the option of this Crown Mode and it works in exactly the same way.
Required for course completion