"Wu Yang" <wya### [at] cswrightedu> wrote in message
news:3dd2a90f$1@news.povray.org...
> height_field {
>    png "fract003.png"
>    water_level 0.4
>    pigment {
>       image_map { png "fract003.png" }
>       rotate 90*x
>    }
>
> I do not know what "rotate 90*x" means in pigment definition. I tried to
> find in the help pages, but I did not find it. Could someone explain it to
> me? Thanks

Just that the height_field is done on the xy plane and the image_map is done
on the xz plane so it needs to be turned to meet the same plane.

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