In article <3a689206@news.povray.org>, "Mark M. Wilson" 
<mrm### [at] worldnetattnet> wrote:




As long as you don't need an angle >= 180, you can just use an 
intersection or difference with two planes:
(this macro is untested!)
#macro TorusArc(MajorRadius, MinorRadius, ArcAngle)
intersection {
    torus {MajorRadius, MinorRadius}
    plane {-z, 0}
    plane {z, 0 rotate -y*ArcAngle}
}
#end

union {
    object {TorusArc(1, 0.1, 60) ...}
    object {TorusArc(1, 0.1, 60) ...}
    object {TorusArc(1, 0.1, 60) ...}
    ...
}

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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