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"jr" <cre### [at] gmail com> wrote:
> hi,
>
> "Kima" <nomail@nomail> wrote:
> > I wrap an image over a lathe by
> >
> > 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>
> > texture{
> > pigment{
> > color rgb<1,0,0>
> > }
> > }
> > texture{
> > pigment{
> > image_map{
> > png "image.png" map_type 2 interpolate 4 once
> >
> > }
> >
> > }
> > }
> > }
> >
> > I have two problems:
> >
> > 1. image_map put the image on the object from the bottom (from south to north).
> > Thus, if the image height is not enough to cover the object, it is always the
> > top part, which is missing.
> >
> > How can I put the image from top to bottom or even on the middle (with respect
> > to the y-axis)?
>
> using your code as posted, I inserted:
> pigment {
> image_map {...}
> rotate <270,0,0>
> }
>
> and the image covers the shape. no ideas wrt second question.
>
>
> regards, jr.
rotating the image_map deforms the image appearance. I do not want to change the
image direction. I just want to move it up. 'translate <0,y,0>' does the job,
but the problem is that I do not have a practical method to calculate `y` to
move the image to the top.
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