Simple example of sphere_sweep cubic spline problem I told of earlier, if
rendered using beta 6. Does not show same in official 3.7 or previous beta 5.

/* begin */
#version 3.7; // or 3.71

global_settings {assumed_gamma 1}

#local SplineType=1;

#local Scale=12.3; // larger scale worsens defect

light_source {<5,10,-20>*Scale, 1}

camera {
 location <0,0,-4*Scale>
 look_at 0
}

/* defect(?) of sphere_sweep cubic spline at center */

sphere_sweep
{
 #if (SplineType) cubic_spline 9,
 #else linear_spline 9,
 #end
 <-3,0,0>,0.1,
 <-2.5,0.5,0>,0.1,
 <-2,-0.2,0>,0.1,
 <-1,0.3,0>,0.1,
 <-0.5,-0.4,0>,0.1,
 <1,0.6,0>,0.1,
 <1.5,-0.1,0>,0.1,
 <2.5,0.3,0>,0.1,
 <3,0,0>,0.1,
 //tolerance 12.3 // uncomment, higher number lessens defect
 // and object might disappear if number very big
 pigment {rgb <1,1,1>}
 scale <1,1,1>*Scale
}
/* end */

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