"Tim Nikias" <tim### [at] gmxde> wrote in message
news:3d480dce@news.povray.org...
> I've found that the "pattern image function" will
> switch up and down of an image. It uses the
> section from <0,0,0> to <1,1,0>, and <1,1,0>
> will be, on a heightfield, the foremost right
> corner, when looking from -z towards z.
> (Hope that explains something... Think about it)
>
> So, in effect, you might be using different
> parts of your pattern (not the y-planar
>  <0,0,0> to <1,0,1>, but the z-planar), or
> its used upside down. Don't know for sure though.

Yes, that was it. I found another little phenomenon.  The attached images
(sorry for the terrible jpg artifacts) show hfs of the same function.
TPGenTestE.JPG uses an external hf image whereas TPGenTestI.JPG uses the
internal type, both at the same res (512x384). As can be seen, the lumps in
the internal one have a much sharper, less rounded shape.  Do they interpret
the input image differently or perhaps the "pattern image function" uses a
different waveform.

-tgq

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Attachments:
Download 'TPGenTestI.JPG' (57 KB) Download 'TPGenTestE.JPG' (59 KB)

Preview of image 'TPGenTestI.JPG'

Preview of image 'TPGenTestE.JPG'