### Author Topic: ==={Challenge}===Helix on top of helix  (Read 1724 times)

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#### Jeremy Dunn

• Newt
• Posts: 31
##### ==={Challenge}===Helix on top of helix
« on: April 06, 2019, 06:30:47 PM »
In AutoCAD we can draw a helix (or spring shape). The challenge here is to be able to define a 2nd order helix on top of the 1st helix so that you have a helix which in turn is twisting along a helical path. Ideally the user should be able to define the 2nd helix by radius and turns per turn of the basis helix. If you are really daring try to write a routine where you can draw an nth order fractal helix. Let the programs begin!

#### ribarm

• Gator
• Posts: 3180
• Marko Ribar, architect
##### Re: ==={Challenge}===Helix on top of helix
« Reply #1 on: April 07, 2019, 12:30:50 AM »
There is this lisp by GP (Gian Paolo Cattaneo)... It's called helix along path - HELIX2.LSP... You can draw path as helix and apply lisp so result will be helix along helix...

HTH., M.R.
Marko Ribar, d.i.a. (graduated engineer of architecture)

#### Jeremy Dunn

• Newt
• Posts: 31
##### Re: ==={Challenge}===Helix on top of helix
« Reply #2 on: April 07, 2019, 04:25:32 AM »
I tried to download the program but it was no longer available.

#### ribarm

• Gator
• Posts: 3180
• Marko Ribar, architect
##### Re: ==={Challenge}===Helix on top of helix
« Reply #3 on: April 07, 2019, 06:12:43 AM »
I tried to download the program but it was no longer available.

I've found it in my library... Hope GP won't mind posting it here...

HTH.
Marko Ribar, d.i.a. (graduated engineer of architecture)