Central point or sphere based on circles set - automate

Rhino Rhino for Windows
1

Hello,

is there any way to automate the process of spheres creation? I have a set of closed curves (circles). I would like to make spheres of all the selected circles (>100). Obviously it makes no sense to click each circle and create spheres.

I know how to automate it with AddSphere command in Rhino Python but I need central points of each circle for that operation. The suggestion how to create central points of each circle in the set would be also valuable.

Thanks in advance!

Kuba

2

Something like this should work…

import rhinoscriptsyntax as rs

#circles
def circ_filt(rhino_object, geometry, component_index):
    return geometry.IsCircle()

def AddSpheresToCircles():
    msg="Select circles to add spheres"
    crvs=rs.GetObjects(msg,4,preselect=True,custom_filter=circ_filt)
    if not crvs: return
    rs.EnableRedraw(False)
    for crv in crvs:
        ctr=rs.CircleCenterPoint(crv)
        rad=rs.CircleRadius(crv)
        rs.AddSphere(ctr,rad)
        #rs.AddPoint(ctr)  #optional to add a point object in center
AddSpheresToCircles()

–Mitch

3

Thanks for your quick answer. For some reason I cannot select any circles after running the script even after changing the filter in getobjects to 0 (all) and gettiing the defined message “Select circles to add spheres”. Any ideas why?

4

Okay, it looks like (for some reason), the curves that I have are not really circles… Any ideas how to fix this?

They are curves made with function TextObject (Braille font used).

5

Yep. If they will not simplify to circles with the native SimplifyCrv command, you can run the following script on them. Depending on how far out from a real circle they are, you will need to set a tolerance for the conversion at the command line. If you set the tolerance to 0, it will turn ANY closed planar curve into a circle…

SimplifyRecalcitrantCircles2.py (3.6 KB)

2 Likes
6

That is awesome! It works now. Looks like these “circles” were in reality polygons with like 20 sides…