Hi
as far as I know the only published work in this area is by Eric De Kemp (eg Computers & Geosciences
Volume 26 Issue 5, June 2000 Pages 509 - 530 ) but from memory Gocad/Mira Mining Suite has built on his algorithms to allow this functionality. As to your choice of symbols, I personally find rectangulaire prisms with lineation traces easier to interpret in 3D, but as with all visualisation issues, this is a matter of personal taste.
cheers
Mark
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