Problem still present in Beta 4.
Wolf

Mark Weyer <wey### [at] informatikuni-freiburgde> wrote:
> Pentium with 300MHz, 64MB RAM
> Persistence of Vision(tm) Ray Tracer Version 3.6.beta.1 gcc@i686-pc-linux-gnu
> Redhat Linux
> /usr/local/share/povray-3.6
>
>
> I regularly use spheresweep with linear_spline and constant radius as
> a shorthand for spheres and cylinders. With 3.5 I never had problems.
> Below is a small scene that works well with 3.5 but has artifacts
> with 3.6. The artifacts go away by scaling or by rotating the entire
> scene.
>
>
>
> camera {
>    location -2*z
>    rotate -70*x
>    rotate 60*z
> }
>
> light_source {<1,-1,-1>*100  1}
> light_source {<0.5,0,1>*100  1/2}
>
> #declare X1=4/15;
> #declare Y1=0;
> #declare Z1=-7/20;
> #declare X2=19/40;
> #declare Y2=-1;
> #declare Z2=-3/20;
> #declare R=1/40;
>
> union {
>    box{-1 1-y pigment{rgb x}}
>    union {
>      sphere_sweep {
>        linear_spline 10
>        <X1,Y1,Z1> R  <X2,Y1,Z1> R  <X2,Y2,Z1> R  <X1,Y2,Z1> R  <X1,Y1,Z1> R
>        <X1,Y1,Z2> R  <X2,Y1,Z2> R  <X2,Y2,Z2> R  <X1,Y2,Z2> R  <X1,Y1,Z2> R
>      }
>      pigment{rgb 1}
>    }
>    rotate 225*z
> }
>
>
>
>
>
> --
> merge{#local i=-11;#while(i<11)#local
> i=i+.1;sphere{<i*(i*i*(.05-i*i*(4e-7*i*i+3e-4))-3)10*sin(i)30>.5}#end
> pigment{rgbt 1}interior{media{emission x}}hollow}//  Mark Weyer

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