"Jaap Frank" <jjf### [at] xs4allnl> wrote in message
news:3d4028e8$1@news.povray.org...
> Hi,
>
> I'm designing a system to make a controlled landscape
> with a height_field when I stumbled over this strange
> behaviour.
> ...
> The problem appears when I rotate the mountain.
> The sigma values for the length and width of the mountain
> in the X- and Z-direction (translated in the formula to Y)
> have to be combined with cos(Rot) and sin(Rot) for the
> rotation (see the #switch-section).

I just figured out that it don't give the rotation I want. There
have to be a X-Z-dependent scaling of sigma, but the effect
of the multiplication is not what you expect.

Jaap Frank

PS. Read allwright without 'w', :-)

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