> This is odd as cylinders are internally represented as cones with two
> equal radii.
>
> Peter Popov
> ICQ: 15002700

And manually bounding each cone by the corresponding cylinder removes the whole
problem (-UR setting necessary)...
BTW, manually bounding the cones speeds them all, see below (compare slow_cone_finite
and slow_cone_finite_bounded for instance).
This problem may have been with POV since the very beginning but until POV 3.0 few
people ventured to make scenes with tens of thousands of cones so it never appeared.

G.

camera {location  -z*1000} light_source{<1,1,-1>*1000 color 2} background{rgb 1}
#declare slow_cone_infinite= cone{0 ,15,<8,90,8> ,14.9}
#declare slow_cone_infinite_bounded= cone{0 ,15,<8,90,8> ,14.9
bounded_by{cylinder{0,<8,90,8> ,15}}}
#declare slow_cone_finite= cone{0 ,15,<8,90,8> ,14.8}
#declare slow_cone_finite_bounded= cone{0 ,15,<8,90,8> ,14.8
bounded_by{cylinder{0,<8,90,8> ,15}}}
#declare fast_cone= cone{0 ,15,<8,90,8> ,10}
#declare fast_cone_bounded= cone{0 ,15,<8,90,8> ,10 bounded_by{cylinder{0,<8,90,8>
,15}}}

#declare testcone=object{slow_cone_infinite}
#declare testcone=object{slow_cone_finite}
#declare testcone=object{fast_cone}

#declare testcone=object{slow_cone_infinite_bounded}
#declare testcone=object{slow_cone_finite_bounded}
#declare testcone=object{fast_cone_bounded}

#declare i=-10;#while (i<10) #declare j=0;#while (j<200)
object{testcone translate <i,0,j>*35 pigment{rgb<1,0,0>}}
#declare j=j+1;#end #declare i=i+1;#end

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