image_map { gif "teststraehne.gif" transmit 0,1  }

should be: image_map { gif "teststraehne.gif" interpolate 2 transmit all 
0.1 }

otherwise one gets an error message.

Tell me what you think about this texture:

#declare tube_material1_=
material {
   texture {
     uv_mapping
     pigment {
       wood
       pigment_map {
         [0.00 srgb <251, 207, 140>/255 filter 0.5]
         [0.50 srgb <171,  77,  14>/255 filter 0.5]
         [1.00 srgb <  0,   0,   0>/255 filter 0.5]
       }
       scale <0.05, 10, 0.05>
       warp {turbulence 0.5}
       translate <3, 0, 2>
     }
     finish {
       specular 0.07843137
       roughness 0.005259534
       diffuse 0.6
     }
   }
}


Thomas

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