finding P1/P2 on elliptical curve ?

Replies to This Discussion

Permalink Reply by David Rutten on May 7, 2014 at 7:04am

Hi Gerhard,

how are P1 and P2 defined? P2 is clearly the end of the major axis, but what is P1?

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David Rutten

david@mcneel.com

Permalink Reply by Gerhard on May 7, 2014 at 7:10am

Hi David,

the distance between P1 und P2 is constant. The length/angle of black lines are fixed.

Gerhard

Permalink Reply by Danny Boyes on May 7, 2014 at 7:21am

This might be a job for Kangaroo

Permalink Reply by David Rutten on May 7, 2014 at 7:55am

Sounds like a job for bicycle repair man!

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David Rutten

david@mcneel.com

Attachments:

• ellipse_section.gh, 12 KB

Permalink Reply by Danny Boyes on May 7, 2014 at 8:21am

...why he's mending it with his own hands!

some how I know you were going to bring him up

:)

Happy Mac day

Permalink Reply by Gerhard on May 7, 2014 at 8:39am

Thank you, David.

First step is done, but a have to do this for various positions. p. ex. P3 P4 P5 P6.......

Permalink Reply by David Rutten on May 7, 2014 at 9:28am

Well you can use my file to measure the distance between P1 and P2, then you can use Circle/Ellipse intersection to find any other two pairs. Only problem is you'll probably get two answers for the intersection, so you need to fire out a way to reject the one you don't like.

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David Rutten

david@mcneel.com

Permalink Reply by Gerhard on May 7, 2014 at 10:43am

Hi David,

Thanks a lot for your help. I'll will follow your proposal.

Gerhard