AutoCAD 2000/2000i/2002 Archive

AutoCAD 2000/2000i/2002 Archive

Reply
*Schafer, Sam
Message 1 of 7 (205 Views)

How to draw a parabola

205 Views, 6 Replies
09-09-2003 05:16 AM
Hi;

Is there a short sweet way to draw a true parabola in plain vanilla Autocad
(similar to how you draw a true ellipse)?

Thanks in advance,

Sam Schafer
*hjs
Message 2 of 7 (205 Views)

Re: How to draw a parabola

09-09-2003 06:44 PM in reply to: *Schafer, Sam
Slicing a cone??
regards
Jochen

"Sam Schafer" schrieb im Newsbeitrag
news:EC916BAE14C5B6A57880723DAB8D57D7@in.WebX.maYIadrTaRb...
> Hi;
>
> Is there a short sweet way to draw a true parabola in plain vanilla
Autocad
> (similar to how you draw a true ellipse)?
>
> Thanks in advance,
>
> Sam Schafer
>
>
*Schafer, Sam
Message 3 of 7 (205 Views)

Re:

09-09-2003 08:48 PM in reply to: *Schafer, Sam
Exactly. What I'm given are a set of nodes along the parabola, but I have
to actually construct the parabolic curve, and have it match up with other
trades. It's an architectural application, so the smoothness of the curve
is just as important as the node locations.

Fun, hey?

Sam

"hjs" wrote in message
news:73DCBE8432C8D2BFDDAB19245ED7396A@in.WebX.maYIadrTaRb...
> Slicing a cone??
> regards
> Jochen
>
> "Sam Schafer" schrieb im Newsbeitrag
> news:EC916BAE14C5B6A57880723DAB8D57D7@in.WebX.maYIadrTaRb...
> > Hi;
> >
> > Is there a short sweet way to draw a true parabola in plain vanilla
> Autocad
> > (similar to how you draw a true ellipse)?
> >
> > Thanks in advance,
> >
> > Sam Schafer
> >
> >
>
>
Distinguished Contributor
old-cadaver
Posts: 5,183
Registered: ‎12-12-2003
Message 4 of 7 (205 Views)

Re:

09-09-2003 10:16 PM in reply to: *Schafer, Sam
>>It's an architectural application, so the smoothness of the curve is just as important as the node locations.<<

Then you need to construct it in the same manner in which you expect the guys building it will construct it onsite.
Distinguished Contributor
SAM90
Posts: 408
Registered: ‎11-11-2003
Message 5 of 7 (205 Views)

Re:

09-09-2003 11:15 PM in reply to: *Schafer, Sam
Trace the parabola with a spline snapping to a suitable grid density then use the toLerance option to smooth it off. Just do half then mirror it.
If you list it, it lists the control points. - Kev
Distinguished Contributor
SAM90
Posts: 408
Registered: ‎11-11-2003
Message 6 of 7 (205 Views)

Re:

09-10-2003 12:20 AM in reply to: *Schafer, Sam
...of course, the control points will not aid construction unless the toLerance options is set to zero.
*jochen
Message 7 of 7 (205 Views)

Re:

09-11-2003 03:12 AM in reply to: *Schafer, Sam
Draw the corresponding cone and slice it (it takes some mathematics to get
the parameters) explode the resulting solid and so you will get a spline
describing your parabola very closely.
Regards
Jochen
www.black-cad.de

"hjs" schrieb im Newsbeitrag
news:73DCBE8432C8D2BFDDAB19245ED7396A@in.WebX.maYIadrTaRb...
> Slicing a cone??
> regards
> Jochen
>
> "Sam Schafer" schrieb im Newsbeitrag
> news:EC916BAE14C5B6A57880723DAB8D57D7@in.WebX.maYIadrTaRb...
> > Hi;
> >
> > Is there a short sweet way to draw a true parabola in plain vanilla
> Autocad
> > (similar to how you draw a true ellipse)?
> >
> > Thanks in advance,
> >
> > Sam Schafer
> >
> >
>
>
Post to the Community

Have questions about Autodesk products? Ask the community.

New Post
Announcements
Are You Going To Be @ AU 2014? Feel free to drop by our AU topic post and share your plans, plug a class that you're teaching, or simply check out who else from the community might be in attendance. Ohh and don't forgot to stop by the Autodesk Help | Learn | Collaborate booths in the Exhibit Hall and meet our community team if you get a chance!