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Repeating part at odd intervals along spline
I'm modeling a roller coaster and have a number of parts that I need to repeat some fifty times. Trouble is.. the pattern is not at regular intervals along a symmetrical path but at odd intervals along an arbitrary spline and at varying angles (tangent to the track). I haven't seen a feature in Onshape that allows me to do exactly this so I'm exploring partial suggestions that simplify the task as much as possible. Or maybe there is a feature made just for this and I missed it?
My best idea at this point is to use a regular pattern along a spline to quickly create the right number of part copies and then to transform each individually---meaning to translate and rotate each. It's better than nothing but it will take a while to do. Better ideas would be much appreciated. Thanks to anyone who can at least point me in the right direction!
You'll notice in that link (a frozen snapshot of the model as it is now) that the columns don't quite touch the spline that now stands for the track. My goal is to add the connection plates at spline level and to then fill the gap between the plates and the columns underneath them. The spacing between columns is variable (to my surprise, but that is how this particular coaster was designed, it seems, without regular patterns).