<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">Hello,<DIV> What is the fastest method to determine if a point is inside or outside a closed surface? I have tried the celllocator and the obbtree but both seem to take a little while. Is there a better method to determine the inside/outside calculation? Are the previous two methods highly dependent on the configuration parameters? If so is the automatic setting pretty good at determining good parameters for a broad range of datasets? Thanks for the help.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Doug</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><DIV> <SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Doug McCorkle - Research Assistant</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Iowa State University</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Virtual Engineering Research Group</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR class="khtml-block-placeholder"></DIV><BR class="Apple-interchange-newline"></SPAN> </DIV><BR></DIV></BODY></HTML>