We are updating the lathe and prism documentation to reflect how the 
point order used in spline specifications can be used to flip the inside 
and outside of these shapes. Further, how bezier splines in lathes can 
have multiple loops/sets unlike other spline types.

The attached image uses both these techniques. Namely, there is a lathe 
with 5 bezier point loops - some in xy clockwise order and some 
reversed. The lathe is cut with a prism and the resulting intersection 
given both inside and outside textures. The bezier spline loop ordering 
controls where each of the two textures get used.

(Textures themselves come form Norbert's materials collection)

Bill P.

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