I was wondering if any progress has been made on 3d fairing of data sets. If one starts with ship coordinates in F-I-S+ format, the rounding transforms continuous curves into steps and zig-zags. Rounding causes most pronounced errors at the bow where things are closer together where even differenc…

Could you post an image or Rhino file to give us an idea of your goal?

Here is an example image. It shows a set of data points. The input data has been rounded. This causes zigzags or steps where the data should be smooth. The curvature graph shows these effect. I could run the FAIR command on a curve. then generate new points from the intersection of the curve. Howev…

One approach: Create a set of edge curves. First create polylines around the boundary from the input points on the edges. Use FitCrv to obtain a NURBS curve from the polyline. The polyline is used as the input to FitCrv because “When the input to the FitCrv command is a polyline, the FitCrv command…

You’re measuring points from a construction drawing? This is very inaccurate you know that right? Not only that these drawings are scaled but there’s also significant mistake in them for sure. Such mistakes become huge when scaling back to 1:1. Even when using OffsetTable you simply can’t get accu…

Offsets on construction drawings are traditionally created by someone measuring the lines plan. The accuracy is limited by the accuracy of the lines plan which is a scale drawing, the accuracy of the measurements, and any rounding/truncation. Typically the rounding/truncation will be smaller the the…

Yep, that’s the problem. When there is a long, gentle slope, you get steps. Where there are curve, you get zigzags. PLUS, there is the problem of intersecting parts. I am trying to see if anyone has come up with a good way to deal with this yet.

Is this of any use here? https://www.rhino3d.com/resources/?id=737

3d Fairing of Table of Offsets

Rhino Rhino for Windows

davidcockey (David Cockey) March 27, 2019, 2:51am 4

Are you working with offsets from construction plans, or offsets from measurements of an actual vessel?

Curvy hull design

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3d Fairing of Table of Offsets

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