"LanuHum" <Lan### [at] yandexru> wrote:
> Hi! I am interested in the question: is it possible to create a thread without a
> mesh of triangles? We need a smooth surface of the thread in the picture
> 38400x21600 (4K * 10)


Here is a simple idea.
#declare i=0;
#while(i<18 )
cone{0,.5,y*-.5,0 translate < .4,-2>  rotate y*360*i translate -y*i*.5
pigment{blue 1}}
 cone{0,.5,y*.5,0 translate <.4,-2>  rotate y*360*i translate -y*i*.5
pigment{red 1}}
#declare step=.01 ;
#declare i=i+step;
#end   translate <0,9,0>}

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