[Therion] the volume of a cave

[Marco Corvi]

hi,

it just happened that i was asked to estimate the volume of a "cave"
(actually a small mine).

therion dxf export is a triangulated surface of the cave wall.
if the surface were oriented
it would be extremely easy to compute the volume.
(the surface of a real cave is always orientable: no klein cave).

all recent versions of therion produce nice-looking dxf.
i tried 5.3.5 and the volume seemed reasonable.
then i tried 5.3.11 and i got an unreasonable value (there is also 
a commented option for new 3d, and the result was even more unreasonable).

so i checked the dxf files.
it seems that none of them is oriented.
is it possible to make therion produce an oriented surface?
thanks.

marco
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