Hi Joerg, so kind of like the snake or Tron lightcycle games where a path is grown leaving a trail behind which you don't want to run into?

Is it required that the closed curve must be made of line segments and not a continuous smooth curve? What if the closed curve is a circle for example?

One thing I noticed is if you put in diagonal lines like this:



Move the diagonal for the start down one step, a quick way to do this is to type 20 and push Enter, that will make a distance constraint active for the next point pick and then you can drag the line down one step:



You now have all the necessary structure to draw the spiral in one single polyline. Before placing the first polyline point type in r20,-20 and push Enter. That will enable an x,y offset to be applied to the next point pick:



From then on straight snap and intersection object snap will give the needed points:







- Michael

Thanks Michael,
a good idea with the diagonal lines for the example (rectangle).

The problem is that I'm looking for a solution that is also working for closed curves that were designed with a Freeform line. Here the the line behind the outline needs to be a child of the outline. Next line needs to be a child of the first child, etc.

I had in mind that such a function was/is existing in MoI or as script from Max Smirnov.

But thanks a lot for your trying to find a solution,

Joerg

Hi Joerg,

re:
> The problem is that I'm looking for a solution that is also working for closed curves that were
> designed with a Freeform line. Here the the line behind the outline needs to be a child of
> the outline. Next line needs to be a child of the first child, etc.

Do you have an example drawing of this type?


> I had in mind that such a function was/is existing in MoI or as script from Max Smirnov.

There is an OffsetMultiStep script here:
https://moi3d.com/forum/index.php?webtag=MOI&msg=4898.19

But it isn't very much like a continuous spiral.

- Michael

If you can figure out how to get the coords for your path, you can use a point file and import point file as polylines to generate the path

Maybe with more discussion we can get a result for you.

Like basically these points can be generated easily by my CAM software with a pocketing operation

Must be a bunch of free options available to do this

There is even a guy in this forum trying to develop a "toolpath" plugin!