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
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