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Create a fit point spline and a control point (CV) spline, and understand their differences.
Type:
Tutorial
Length:
4 min.
Transcript
00:04
Let's talk about splines.
00:06
A spine is defined
00:08
in the documentation for Autocad
00:10
as a smooth curve that passes through or near a
00:14
set of points that influence the shape of the curve.
00:20
You can think of it as Autocad smoothed it out.
00:24
For me, it's very different than curved segments within a polyline,
00:28
a spline smooths curves.
00:31
But when you click on it,
00:32
you will notice that the control points are not directly on the geometry.
00:37
Spines are used in situations where the appearance of smooth curve geometry is key
00:42
and they provide you with a quick and easy way to create those smooth curves.
00:47
Splines have been improved in recent versions of Autocad
00:50
and you can easily control them with grip editing.
00:55
When creating spines in Autocad,
00:58
you have the choice of using fit points or control points.
01:01
If you have a tight area to create a spine in,
01:04
you might want to use fit points as fit points
01:07
for a spine work in a similar way as poly lines
01:11
in that the vertices lie directly on the geometry of the spine.
01:17
Control points would be used in situations where you want
01:20
to have more control over the vertices through grip,
01:24
edits,
01:25
control points work a little bit differently as we will see shortly.
01:30
Let's create our first spline using the fit points option.
01:35
For this example,
01:36
we will go through using a Spline to create
01:39
a meandering sidewalk where smooth curve geometry is essential
01:45
to access this command. You can type in Spline
01:49
and then once you
01:51
click enter,
01:53
you can choose the method option
01:55
and then choose from fit
01:58
or CV,
02:02
specify our first point.
02:06
And as we drag the cursor along,
02:13
we get smooth curves.
02:17
Now to finish the meandering sidewalk, we can use the offset command
02:23
offset with a distance of five
02:30
and there we have it.
02:34
Once the spine has been created,
02:37
we can click on it
02:40
and notice the grips that it has,
02:44
you can change it from
02:45
fit to control vertices with the grips
02:50
and the grips are located directly
02:53
on top of the spine.
02:57
If we change it to control vertices,
03:01
then you can see the difference in where
03:05
the control points show up
03:11
next. We will create a Spline using the control points option
03:16
to access his command.
03:18
As before
03:19
you can simply type in Spline,
03:25
choose the method
03:27
and then choose CV,
03:31
click points on the screen.
03:34
And you can see that
03:36
this method acts a little bit more
03:40
like arcs
03:45
once created.
03:46
When you click on this type of spine, you can see that the
03:51
grips are not directly on top of the geometry.
03:57
The control vertices
03:59
as the name states gives you more control to grip, edit the vertices.
Video transcript
00:04
Let's talk about splines.
00:06
A spine is defined
00:08
in the documentation for Autocad
00:10
as a smooth curve that passes through or near a
00:14
set of points that influence the shape of the curve.
00:20
You can think of it as Autocad smoothed it out.
00:24
For me, it's very different than curved segments within a polyline,
00:28
a spline smooths curves.
00:31
But when you click on it,
00:32
you will notice that the control points are not directly on the geometry.
00:37
Spines are used in situations where the appearance of smooth curve geometry is key
00:42
and they provide you with a quick and easy way to create those smooth curves.
00:47
Splines have been improved in recent versions of Autocad
00:50
and you can easily control them with grip editing.
00:55
When creating spines in Autocad,
00:58
you have the choice of using fit points or control points.
01:01
If you have a tight area to create a spine in,
01:04
you might want to use fit points as fit points
01:07
for a spine work in a similar way as poly lines
01:11
in that the vertices lie directly on the geometry of the spine.
01:17
Control points would be used in situations where you want
01:20
to have more control over the vertices through grip,
01:24
edits,
01:25
control points work a little bit differently as we will see shortly.
01:30
Let's create our first spline using the fit points option.
01:35
For this example,
01:36
we will go through using a Spline to create
01:39
a meandering sidewalk where smooth curve geometry is essential
01:45
to access this command. You can type in Spline
01:49
and then once you
01:51
click enter,
01:53
you can choose the method option
01:55
and then choose from fit
01:58
or CV,
02:02
specify our first point.
02:06
And as we drag the cursor along,
02:13
we get smooth curves.
02:17
Now to finish the meandering sidewalk, we can use the offset command
02:23
offset with a distance of five
02:30
and there we have it.
02:34
Once the spine has been created,
02:37
we can click on it
02:40
and notice the grips that it has,
02:44
you can change it from
02:45
fit to control vertices with the grips
02:50
and the grips are located directly
02:53
on top of the spine.
02:57
If we change it to control vertices,
03:01
then you can see the difference in where
03:05
the control points show up
03:11
next. We will create a Spline using the control points option
03:16
to access his command.
03:18
As before
03:19
you can simply type in Spline,
03:25
choose the method
03:27
and then choose CV,
03:31
click points on the screen.
03:34
And you can see that
03:36
this method acts a little bit more
03:40
like arcs
03:45
once created.
03:46
When you click on this type of spine, you can see that the
03:51
grips are not directly on top of the geometry.
03:57
The control vertices
03:59
as the name states gives you more control to grip, edit the vertices.
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