Lathes present artifacts with pov3.7beta4 which do not happen with
pov3.6. Here is an example (from trace_wicker.pov). 'sturm' does not
change anything:


#declare BottleLathe =
lathe{
	cubic_spline
	15,
	<0.036140,0.004819>,<0.228886,0.036140>,<0.293938,0.279482>,
	<0.106010,0.599923>,<0.055415,0.850493>,<0.103601,0.951684>,
	<0.072280,0.990234>,<0.038549,0.963731>,<0.062643,0.619197>,
	<0.277073,0.257798>,<0.185518,0.038549>,<0.014456,0.060233>,
	<0.036140,0.004819>,<0.228886,0.036140>,<0.293938,0.279482>
}

#declare BigBottle = object {
 BottleLathe
 scale 50
 pigment { rgb <0,1,0> } finish {phong .9}
}

object {BigBottle}

light_source {<100,300,200>, 1}
camera {location <100,100,100> direction z*3 look_at <0,25,0>}
plane {y,0 pigment { rgb 1 }}


-- 
                                                          - Warp

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