Dear All,

The following scene contains a thin line where there should be no line.
I have tried this in various combinations and the problem seems to be
in the rotation. Rotating the prism by -90.01 degrees causes the problem to
go away. This problem also occurs using 3.0 which I still have on disk.
Is there any way around this ?

#include "colors.inc"
background {White}
light_source { <400,300,-300> color White }
camera { orthographic
 up <0,600,0>
 right <800,0,0>
 location  <400,300,-600>
 look_at  <400,300,0> }
prism { linear_sweep linear_spline 0,0.1,5
 ,<200,85>
 ,<200,115>
 ,<400,315>
 ,<400,285>
 ,<200,85>
 pigment { Red }
    rotate <-90,0,0>
    }

Regards,

    Nigel.

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