CurveBooleanUnion fails unexpectedly on Mac WIP

Rhino Rhino for Mac
#1

CurveBooleanUnion fails to produce a result for the attached input.

bu.3dm (40.5 KB)

I’m using the following python script to execute the CurveBooleanUnion command.

import rhinoscriptsyntax as rs

def Test():
    crvs = rs.GetObjects("Curves", rs.filter.curve)
    u = rs.CurveBooleanUnion(crvs)
    if u:
        rs.SelectObject(u)
    else:
        rs.MessageBox("Union failed")


# Check to see if this file is being executed as the "Main" python
# script instead of being used as a module by some other python script
# This allows us to use the module which ever way we want.
if __name__ == '__main__':
    Test()

# NOTE: see UseModule.py sample for using this script as a module

I’ve looked at the CurveBooleanUnion code in curve.py and it seems like the underlying Rhino function must be failing to return any valid curves.

#2

not exactly sure why your model is failing but if you draw a couple of circles which intersect, the code works.

#3

Yes, it works for every simple example I have tried, but it fails consistently in my particular use case. Based on trial and error, I noticed that it seems to fail when combining shapes that have very small differences.

#4

The difference between your curves is the same as the absolute file tolerance in some areas. If you tighten the absolute tolerance to .001, your script succeeds.

http://wiki.mcneel.com/rhino/faqtolerances

HTH, --Mitch