how can i get Center Line?

Replies to This Discussion

Permalink Reply by David Rutten on December 23, 2016 at 4:22am

There's nothing in the Rhino SDK that will help you, you'll need to develop some sort of algorithm from scratch. This sounds like it would be pretty difficult, unless you can make a lot of assumptions for the specific cases you'll be needing this for (ie. walls never thicker than x mm, walls never shorter than y mm, walls always at 90 degrees angles, ...)

Permalink Reply by mark zirinsky on December 23, 2016 at 6:17am

There is a way, using veronai, to find the center line, I believe one of Daniel Piker's older posts show this method. Also, if you look at the method shown a few days ago by Shridhar Mamidalaa for producing beveled text from a curve, then extract or calculate the 'centerline ridge', that will also give you the centerline, more accurately than the veronai method.

another way, if you will always be working  with linear walls (no curves), is to calculate midpoints of the endlines of the wall, perpendicular to the long axis of each wall segment, then connect the dots. Or, if you can filter out the discontinuities, try using the "tween curves" component.

Permalink Reply by Anders Holden Deleuran on December 23, 2016 at 9:25am

Depending on your needs, the Medial Axis or the Straight Skeleton might work for you. There are several algorithms for calculating these. I remember seeing a couple of medial axis implementations on the forum, believe they all use the subdivision/voronoi method.