<div dir="ltr"><div>Hi, <br></div><div><br></div><div>Thank you for the very useful "volume statistics" tool!</div><div><br></div><div>I was wondering: how is the volume computed in Loch?</div><div><br></div><div>Looking at Loch-generated models in Paraview, it seems to me that Loch creates the volumes by joining every station to the splays radiating from the previous and next stations, creating a sequence of pyramid-like solids, like in this schematics:</div><div><img src="cid:ii_kzvsiogq1" alt="image.png" width="563" height="257"><br></div><div>(black=centreline shots, dashed grey=splay shots). <br></div><div>Does each of these "pyramids" contribute to the total with its own volume?<br></div><div>With this method, the mesh would contain intersecting volumes. To simplify, if we imagine a cone with apex at the stations, the cones intersect:</div><div><img src="cid:ii_kzvt2s5k2" alt="image.png" width="563" height="176"></div><div>How does the computation of the total volume deal with the intersections of the cones? <br></div><div>Does it somehow avoid the double-counting coming from the intersecting regions?</div><div><br></div><div>Thank you,</div><div>Best,</div><div>Francesco<br></div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Feb 20, 2022 at 4:08 PM Tarquin Wilton-Jones via Therion <<a href="mailto:therion@speleo.sk">therion@speleo.sk</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">"added support for cave volume calculation (Tools → Survey statistics)"<div dir="auto"><br></div><div dir="auto">Awesome addition.</div><div dir="auto"><br></div><div dir="auto">Could someone maybe explain what the difference is between 3D and LRUD envelope?</div><div dir="auto">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. Sometimes much bigger (one of my simple caves) sometimes much smaller ( a pothole).</div><div><br></div></div>_______________________________________________<br>
Therion mailing list<br>
<a href="mailto:Therion@speleo.sk" target="_blank">Therion@speleo.sk</a><br>
<a href="https://mailman.speleo.sk/listinfo/therion" rel="noreferrer" target="_blank">https://mailman.speleo.sk/listinfo/therion</a><br>
</blockquote></div>