<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">How do you create a mask image from a polygon surface?<DIV><BR class="khtml-block-placeholder"></DIV><DIV>Doug</DIV><DIV><BR><DIV><DIV>On Sep 21, 2006, at 8:46 PM, Yixun Liu wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><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><FONT face="Bookman Old Style"><SPAN class="Apple-style-span" style="font-family: Bookman Old Style; ">Hi,</SPAN></FONT></DIV><DIV><FONT face="Bookman Old Style"><SPAN class="Apple-style-span" style="font-family: Bookman Old Style; ">If the surface is represented by a mask image you can determine its location according to its intensity. If this surface is a polygon surface you can preprocess it to a mask image.</SPAN></FONT></DIV><DIV><FONT face="Bookman Old Style"></FONT> </DIV><DIV><FONT face="Bookman Old Style"><SPAN class="Apple-style-span" style="font-family: Bookman Old Style; ">Hope it help.</SPAN></FONT></DIV><DIV><FONT face="Bookman Old Style"></FONT> </DIV><DIV><FONT face="Bookman Old Style"><SPAN class="Apple-style-span" style="font-family: Bookman Old Style; ">Yixun Liu</SPAN></FONT></DIV><BR class="Apple-interchange-newline"></SPAN></BLOCKQUOTE></DIV><DIV><BR class="khtml-block-placeholder"></DIV><BR></DIV></BODY></HTML>