openscad/openscad — pull request #639 by OskarLinde (2014-02-05 16:33:09+00:00)
Title: Performance: Speed up CGAL n-ary union

By utilizing CGAL::Nef_nary_union_3, n-ary union of many objects becomes significantly
faster (more than twice as fast in a test of 20 objects).

A further optimization potential lies in sorting the unioned objects based on proximity.