"zeycus" <mig### [at] onocom> wrote in message 
news:web.47a44adec0e4bb1b5f201c20@news.povray.org...
> Hi everybody,
>
> I have a bitmap I want to project onto the surface of a sphere. I want to 
> use
> spherical projection, so that the image is not distorted. The problem is 
> that I
> want to control the angle covered (measured from the center of the 
> sphere). One
> solution would be to increase the bitmap size with nothing around, but 
> that is
> ugly. What is the correct way to do this?
>

Hi,

Use the 'once' keyword and scale in 'x'  to get a segment (or scale in 'y' 
and translate in 'y' to get a ring around the middle of the sphere).

light_source { <-15,7.5,-15>, rgb 2}
camera {location <0,3,0> look_at <0,0,0>}

sphere {0,1
  texture {
    pigment {
      image_map {sys "ngtest11.bmp" once}
      scale 0.6*x
      rotate x*90
      warp {spherical
        orientation y
        dist_exp 1
      }
    }
  }
}


> Another question: I am using a bitmap obtained from a postscript file I 
> have,
> because I did not find the way to use the PS directly. Is it possible?
>

No. The valid bitmap types are "gif | tga | iff | ppm | pgm | png | jpeg | 
tiff | sys".
No vector graphics formats are supported.

Regards,
Chris B.

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