Ripley's K in R^3?

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Ripley's K in R^3?
Does anyone have code for calculating Ripley's K on point processes in R^3?
'Kfn' in the package 'spatial' only handles point processes in R^2.

A colleague is interested in using this as a first step in analyzing the
3-d display of shrub branch tips.  The tricky part is determining the
appropriate edge correction for the vertical dimension as the toroidal
correction doesn't really make sense.

Cheers and Happy Holidays,

Joel H. Reynolds, Biometrician

Division of Natural Resources
US Fish & Wildlife Service
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