"Kima" <nomail@nomail> wrote:

> In my case, scale<0.5,0.5, 1> leads to half-height but still full (360-degree)
> cylindrical wrap.

I think that might be the nature of the cylindrical mapping mechanism.
If you want to make it only cover half of the circumference, you might need to
buffer the image on either side with half as many pixels in a transparent
"color".

But I did get what I think you want using uv_mapping.

#version 3.8;

global_settings {
 assumed_gamma 1
}

#include "colors.inc"


light_source {<1, 3, -3> color White}
sky_sphere {pigment {White}}

#declare Aspect = image_width/image_height;
camera {
 location <0, 2, -4>
 right x*Aspect
 up y
 sky y
 direction z
 look_at <0, 1, 0>
}

#declare YSize = 1.6;
 #declare ImageMap =
          pigment {image_map {"/home/oem/Documents/POV-Ray-3.8/0.gif" once} };
 #declare Resolution = max_extent (ImageMap);
 #declare Resolution = Resolution + <0, 0, 1>;

#declare Lathe =
lathe{
  cubic_spline 8,
     < 0.00, 0.00>,
     < 0.60, 0.00>,
     < 0.72, 0.44>,
     < 0.31, 0.93>,
     < 0.49, 1.26>,
     < 0.48, 1.35>,
     < 0.43, 1.56>,
     < 0.16, 1.60>
      uv_mapping
 pigment {Blue}

     texture{
      ImageMap translate <-0.5, 0, 0>
      scale Resolution*(1/Resolution.y)*YSize
      scale x*pi*(0.72/2)/2
     }

}

object {Lathe}

object {Lathe rotate -y*90 translate  -x*2}

object {Lathe rotate y*90 translate  x*2}

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