Extract curves from point cloud

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Extract curves from point cloud

benoit duinat
Hi, 

I'm trying to get the position of 4 points that represent breaking point from curves in the point cloud. I used projection to have all points in the same plan, and now I would like to find the closest polyline that match the point cloud, to find the coordinates of these 4 points.
I tried Ransac without succes because the lines are not straight, any ideas on how I could perfom that.

Thanks
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Duinat Benoit
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