<html><body><div style="color:#000; background-color:#fff; font-family:bookman old style, new york, times, serif;font-size:12pt">hi,<br><br>it just happened that i was asked to estimate the volume of a "cave"<br>(actually a small mine).<br><br>therion dxf export is a triangulated surface of the cave wall.<br>if the surface were oriented<br>it would be extremely easy to compute the volume.<br>(the surface of a real cave is always orientable: no klein cave).<br><br>all recent versions of therion produce nice-looking dxf.<br>i tried 5.3.5 and the volume seemed reasonable.<br>then i tried 5.3.11 and i got an unreasonable value (there is also <br>a commented option for new 3d, and the result was even more unreasonable).<br><br>so i checked the dxf files.<br>it seems that none of them is oriented.<br>is it possible to make therion produce an oriented surface?<br>thanks.<br><br>marco<br><div style="font-family: bookman old style, new york, times, serif;
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