SPLINE <-> POLYLINE SPLINEABLE with pedit

Weslley X Wang

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Mar 26, 1998, 3:00:00 AM3/26/98

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who know the difference of the SPLINE and the POLYLINE changed with pedit
"SPLINE" option.

Wes

Hal S.

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Mar 27, 1998, 3:00:00 AM3/27/98

to Weslley X Wang

A spline is a smooth curve that is formed from the vertex point of a
polyline.
Hal

Vladimir Nesterovsky

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Mar 27, 1998, 3:00:00 AM3/27/98

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Splined polyline is a spline with control points only,
without fit points data.

------- Original message: -------
On Thu, 26 Mar 1998 16:52:48 -0600, - "Weslley X Wang"
<wesl...@aracnet.net> wrote in autodesk.autocad.customization:

>who know the difference of the SPLINE and the POLYLINE changed with pedit
>"SPLINE" option.

---
Live long and prosper :)
Vlad http://www.netvision.net.il/php/vnestr

Dirceu Calani

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Mar 27, 1998, 3:00:00 AM3/27/98

to Weslley X Wang

Weslley X Wang wrote:
>
> who know the difference of the SPLINE and the POLYLINE changed with pedit
> "SPLINE" option.
>

> Wes
When you do some plines without curves you can join them and in the
pedit command do the spline and transform them.

Reinaldo Togores

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Mar 29, 1998, 3:00:00 AM3/29/98

to Weslley X Wang

Hi Weslley:
Check my page on splines at:
http://personales.mundivia.es/personales/rtogores/
Hope it can help.

Weslley X Wang escribió:

> who know the difference of the SPLINE and the POLYLINE changed with pedit
> "SPLINE" option.
>
> Wes

--
Reinaldo Togores
Profesor Asociado de Técnicas de Expresión Gráfica
Universidad de Cantabria
URL: http://personales.mundivia.es/personales/rtogores/
teléfono (907) 830093

Ian Humes

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Mar 30, 1998, 3:00:00 AM3/30/98

to

Hi Weslley,

A Polyline that has been "splined" by pedit is an approximation to a true
spline, rather like using divide on a curve and joining up the points. The
accuracy of the approximation is set by the splinesegs system variable. As a

rough guide for the number of segments created after pedit>spline you should
multiple the splinesegs setting (default value 8) by one less than the number

of segments in the polyline. Using Pedit>spline with multi-element polylines

and a large value for the splinesegs system variable will create a polyline
with thousands of vertices. These sorts of entities can have a major impact
on
your machine, you can quite easily create more vertices in one object than
exist in the rest of the drawing.

A Spline is a smooth curve passing through or near to a set of control
points.
Creating true spline curves rather than editing polylines to approximate
splines has three advantages

1, Spline curves can be created by interpolating the spline through a set of
points that lie on the desired path of the curve. This method creates curved
boundaries far more accurately than polylines for both 2D drafting and 3D
modeling.

2, Splines can be edited easily either with the SPLINEDIT command or with
grips, and the spline definition is maintained. This definition is lost with
PEDIT-smoothed polylines. See "Editing Splines."

3, A drawing containing splines uses less disk space and memory than a
drawing
with smoothed polylines.

I hope that this helps to answer your question.

Ian Humes
Product Support Technician
Guildford - UK