"yesbird" <nomail@nomail> wrote:
> > I thought for sure that this had been corrected, but I have not played around
> > lately with such height_fields to see.
>
> May be it's time for bug report ?
> --

I think that was done long ago; I know that *I* reported it in the distant past,
but probably not to the bug-reports page.

So I did another test... and confirmed that the problem is still there :-(  I'm
almost(?) sure that one of the v3.7 - v3.8 'development' versions in the past
had fixed this behavior...if only temporarily, it seems.

One example here uses the 'onion' pattern; the other uses an
image_map-to-function:

#declare somb =
function{pigment{image_map{jpeg "test image.jpg" once interpolate 2}}}

then...

function 1000, 1000 { somb(x,y,z).gray}

Of course, this weird effect can be fixed after-the-fact, with appropriate
negative scaling etc...
    scale <1,1,-1>
    translate <0,0,1>

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