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</o:shapelayout></xml><![endif]--></head><body lang=EN-NZ link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><div><p class=MsoNormal>“Could someone maybe explain what the difference is between 3D and LRUD envelope?<o:p></o:p></p></div><div><p class=MsoNormal>I get how 3D probably works based on the rendered 3D view of the cave. But how can the LRUD thing work when I only use splays instead of LRUD? Does it just pick some particular or average splay and use it as a LRUD measurement? The results are so vastly different.”<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>My inference is that if you enter LRUD for a piece of passage, that is used to calculate volume, and if you have splays, those are used. Hence the result just follows the type of data entered. My datasets usually result in one or the other being zero, because they only have either splays or LRUD. Some datasets have only a few LRUD and many kilometres of splays. These naturally (and presumably appropriately) report volumes with orders of magnitude difference.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Bruce<o:p></o:p></p></div></div></body></html>