Draw a knot in 3D.

Knot-related Computing
1

http://www.google.de/imgres?imgurl=http://www.thebest3d.com/curvy/tutorials/knot/Clipboard01.jpg&imgrefurl=http://www.thebest3d.com/curvy/tutorials/knot/index.html&h=768&w=1024&tbnid=fOJdIhyupXiZFM:&tbnh=90&tbnw=120&usg=__H-tv5ESeuHomXexLIh2lNqw9iDg=&docid=3euO_Tfmd3sSiM&sa=X&ved=0CEAQ9QEwA2oVChMI96zI-KCoxwIVhEAaCh1bewNZ

http://curvy3d.com/index.html

2

Sadly, only for Windows and Mac, and it will knock you back a hefty ?100.

3

Houdini Apprentice is free. You don’t need to understand everything about this complicated program. Just add a curve (change its type to “bezier”) and after that add a sweep node. The current version allows you to specify the cross section is a circle. This is a very easy way to create a 3D knot.

4

Great program possibilities.
https://youtu.be/uBHf7bFLmo8

5

i never tried it, but if gave up on how i draw now
i was going to go with Blender .

6

I prefer FreeCAD

7

ABOK #2209 / #2210
Optimal geometry.
One segment repeated many times.

8

All the stuff i do is in 2D w/layers of some convoluted, process i made up.

But do able
Many, open source 3d modeling for drawings, animation, autocad knock offs etc. Many draw pipes etc.
always a hefty l-earning curve of their own
i end up crawling back to what i think i know!

https://upload.wikimedia.org/wikipedia/commons/0/03/Tumble_Hitch_for_Quick_Release.png