If your rectangle ribbon has the same length and width than original curves lofted maybe deformation will be insignificant!

Use Unwrap curve for have their length http://moi3d.com/forum/messages.php?webtag=MOI&msg=5136.1

Hi Tom,

> Ís there a solution if the rails keep exactly the same distance from each other ?

I'm not really sure but it doesn't seem likely if the rails are non-planar.

If the exact rail distance is the same as the side of your square it might then be possible to put ruling lines between the rails but if you then try to put 2 corner points on one of those ruling lines, the other side isn't going to touch the rails that are constantly bending.

I just don't see how it's possible to have all 4 corner points all exactly touching a rail, probably the best result that you could get would be some kind of very specialized shape fitting function that tried to reduce the distance the corners were away from the rails.

- Michael

Seems to be that my idea / approach itself was wrong and that it is just
impossible to achieve what I had put in my mind.

Thank you both Pilou and Michael !

Maybe another solution
Build a median curve from your 2 original curves

Array Curve your object

There is also Copy (an object) to Points http://kyticka.webzdarma.cz/3d/moi/#CopyToPoints
but not sure the orientation will be always good even you take the center of gravity as your curve is some circonvoluted! ;)

>>Maybe another solution
Build a median curve from your 2 original curves
Array Curve your object<<

I tried that did not really work>>There is also Copy (an object) to Points http://kyticka.webzdarma.cz/3d/moi/#CopyToPoints
but not sure the orientation will be always good even you take the center of gravity as your curve is some circonvoluted! ;)<<

Good tip, will have a look !

I think a way to go will be to create a zigzagged edged curve to embed the gems which
follows the contour of the original curve.

There is an ArrayGem script.
- B

I have tried it for my purpose but did work as I expected, will have a look again.

Hi Tom,
I used the array gem command to get the following result.
I lofted between your 2 curves to give a surface.
Produced a curve in the middle of your 2 curves using the iso tool .
Added a base diameter to your gem and then ran the script.
Hope this helps.
Barry

Looks awesome - possible I made a mistake when I tried out the arraygem !

Hi
Same result here
I join the 3dm file

Thank you for adding your file, Finema - great !