>> Meshes silently drop degenerate triangles.  Keep in mind that there's more
>> ways for a triangle - especially a smooth triangle - to be degenerate than
>> just the obvious "collinear vertices" one.
> 
> Like?

If the normal vectors aren't all within 90 degrees of each other.

> begin 666 media.jpg

Please put binaries in the proper place.


--
#macro R(L P)sphere{L __}cylinder{L P __}#end#macro P(_1)union{R(z+_ z)R(-z _-z)
R(_-z*3_+z)torus{1__ clipped_by{plane{_ 0}}}translate z+_1}#end#macro S(_)9-(_1-
_)*(_1-_)#end#macro Z(_1 _ __)union{P(_)P(-_)R(y-z-1_)translate.1*_1-y*8pigment{
rgb<S(7)S(5)S(3)>}}#if(_1)Z(_1-__,_,__)#end#end Z(10x*-2,.2)camera{rotate x*90}

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