Hm, hm, hm,

I didn't like to correct you, but the tubes are uv-mapped which allowed for my
cheap trick. I used the "sausages" by intention and created a very simple
texture with my favorite graphics software:

#include "colors.inc"

camera{
   orthographic
   location <0,0,-1000>
   look_at <0,0,0>

   right 1024*x
   up 1024*y
}
light_source { <0,0,-1000>, color White }

box { <-1024,-100,-1>,<1024,50,1> rotate <0,0,-45> translate <0,512,0> pigment {
color Red } }
box { <-1024,-100,-1>,<1024,50,1> rotate <0,0,-45> translate <0,-512,0> pigment
{ color Red } }

I saved it as a GIF (teststraehne.gif) and used the following texture for the
tubes:

#declare tube_material1_=
material{
texture{ uv_mapping pigment { image_map { gif "teststraehne.gif" transmit 0,1  }
scale <1,1/16,1>}
        finish{specular 0 roughness 0.09632328 ambient rgb <0.00,0.00,0.00>
diffuse 0.6   reflection{0 } conserve_energy}}
}

That's all.

Regards,
Michael

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