Small shpes converted to a circle

Rhino Rhino for Windows
1

So I’m working on these panels that have thousands of leaf like shapes. Once the shape is smaller than my 1/8" cutter on my CNC I want to just drill a hole, to do this I need to convert all of these little shapes into a circle. does anyone have a technique for addressing this type of situation.

I would ideally like to be able to search the file and get a circle drop in the center of the shape.

Thanks in advance.

Bill Paquette

2

Hi William - sounds like a script to me - if the shapes are closed curves (?), then possibly replacing each one that is smaller than a certain area, or bounding box areal, with a circle centered on the curves bounding box center or area-centroid would do it - does that sound like it might be the thing?

@wbp1000 - here’s a quick rework of an old RhinoScript, just guessing a bit at what you want, assuming I am correct that the curves are closed and planar- save, then drag and drop this onto Rhino, it will add ReplaceSmallCurves as an alias to run the script.

Set a minimum radius, then a minimum area for the curves to replace. If that does about the right thing, we can tune it up in a Python that lets you select a curve to set the smallest, something like that…

ReplaceSmallCurves.rvb (2.2 KB)

-Pascal

3

Wow, That’s Awesome, thank you. As I’m learning to hone my skills I’m constantly amazed at the rich features you have developed.

4

I am trying to do this or something similar. I have polysurfaces inserted from Sketchup with polygonal holes. I would like to convert these polygonal holes to either a round hole, a circle, or a point at the center. I don’t mind if i need to dupfaceborder and work with 2D. I just need usable geometry to drive CAM for a drilling function., so a point at the center of each polygon would be great or converting them to circles or holes. I tried the script as is in Rhino8 and could not get it to work with my geometry. I have 5mm holes, 8mm holes and 32mm holes.

5

please post some sample geometry

6

polygonal hole example.3dm (2.1 MB)

7

polygonal hole example -02.3dm (1.5 MB)

8

this can be solved by scripting or grasshopper.
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