In article <8F3BD8EFAseed7@204.213.191.228>, ing### [at] homenl (ingo) 
wrote:

> Still playing with the X', tying to make a texture with it. But I 
> encounter black lines and can't find a reason for it in the scene. 
> What causes it? Or is it inaccuracy of Povray (MegaPov)?

It is a precision problem, similar to the coincident surfaces problem. 
Try replacing xPigm with this version, scaled and translated to avoid 
the problem:
#declare xPigm =
function {
    pigment {
        object {Letter
            pigment {rgb 1}
            pigment {rgb 0}
        }
        warp {repeat x}
        warp {repeat y}
        scale < 1, 1.00002, 1>
        translate < 0,-0.00001, 0>
    } 
}

-- 
Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/

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