No problem. FYI, nsphere extension should now compile with current develop and master branches. However this means that it may not work with older Boost releases.Hi Adam, Thnx for the help. First I'll try the simple upgrade for a custom circle/sphere class and see how it's going to affect the timings. After I'll look into R tree node visitor and try to write my own node visitor. If I have any questions I'll try the Gitter chat.