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## AutoCAD 2007/2008/2009 DWG Format

Member
Posts: 4
Registered: ‎10-24-2010

# How to draw shapes using equations?

239 Views, 4 Replies
01-23-2013 07:54 PM

Hello,

I want to draw an exponential taper 2D structure having a particulare taper equation.

How can I draw such shapes?

Thank you for your help.

Regards,

Nirmal.

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*Expert Elite*
Posts: 21,908
Registered: ‎04-20-2006

# Re: How to draw shapes using equations?

01-29-2013 09:07 AM in reply to: nirmalp

Calculate a few points and then place a spline between the points.

Calculate twice as many points and create a new spline.

Is there a significant (manufacturable, measurable (using standard measuring tools - not AutoCAD) difference between the two curves?

If not then you might try again with half as many points as the first curve.

You could find out that you need to calculate far fewer points than you might think.

Please mark this response as "Accept as Solution" if it answers your question.
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Member
Posts: 4
Registered: ‎10-24-2010

# Re: How to draw shapes using equations?

01-29-2013 10:15 AM in reply to: JDMather

Hello,

Thank you for your reply.

I am designing the optical waveguide & it design changes might affect my final feild response after passing through all the components.

I have all the co-ordinates/points(around 7000) for the curve:

Can I plot all the points using some function line pline or spline?

If yes, can you elaborate the way to enter the co-ordinates?

Somebody suggested me to copy paste x & y co-ordinates. but I am not able to do that.

Thank you.

Regards,

Nirmal.

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*Expert Elite*
Posts: 5,313
Registered: ‎09-16-2009

# Re: How to draw shapes using equations?

01-30-2013 06:13 AM in reply to: nirmalp

Get 30 free trial C3D and bring in the points if they are that many.

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*Expert Elite*
Posts: 21,908
Registered: ‎04-20-2006

# Re: How to draw shapes using equations?

01-30-2013 08:43 AM in reply to: nirmalp

nirmalp wrote:

Hello,

I am designing the optical waveguide & it design changes might affect my final feild response after passing through all the components.

I have all the co-ordinates/points(around 7000) for the curve:

Nirmal.

I think something like Autodesk Inventor would be a better tool for this application.
I'm sure there is probably a list out there that willl draw a spline from a list of points, but -

where did these points come from?  Caculated? Scanned point cloud?

If calculated I'll wager that just as good results could be obtained from 70 points and maybe far far fewer.

In Inventor you can enter points from Excel

or

enter Equations directly.

The advantage to the second method is if you need to tweek the numbers - the model will automatically update.

If you must use AutoCAD this might help http://www.google.com/#hl=en&tbo=d&output=search&sclient=psy-ab&q=autocad+spline+from+excel&oq=autoc...

Please mark this response as "Accept as Solution" if it answers your question.
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http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm
http://www.autodesk.com/edcommunity
Still waiting for -Draft option on any Rib feature.
Please use plain text.