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In article <38c38e9c@news.povray.org>, "Lars Luthman" <no### [at] spamse>
wrote:
> Is there a tutorial somewhere on how to create realistic looking
> mountains in POV without using image files as heightfields (for
> example using the isosurfaces in MegaPOV)? Or could someone reply to
> this message and explain the basics?
Well, you can use a height field without an image, using a pattern
instead. To do that you use the "pattern" keyword. Here is the syntax
and a sample copied from the MegaPOV documentation:
pattern Width, Height { [ hf_gray_16] PIGMENT }
#declare QuickLandscape =
height_field {
pattern 200, 200 {hf_gray_16 bozo
color_map { [0 rgb 0] [1 rgb 1] }
}
}
There are many ways to do it with an isosurface, it depends on what kind
of terrain you are looking for. You could use the ridged multifractal
functions(which I have never used and don't know anything about), a
plane displaced with one or several noise3d() functions, or a plane
displaced with one or several pigments. Of the last two, mixing pigments
is more flexible but possibly slower.
An example:
#declare WrinklesFunc =
function {
pigment {wrinkles
color_map {[0 color Black][1 color White]}
}
}
isosurface {
function {y - // the xy plane...
WrinklesFunc(x, 0, z)*5 -
WrinklesFunc(x*3, 0, z*3)*2
// notice the y value is set to 0
// If y is used in this part, overhangs
// are possible.
}
threshold 0
}
--
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/
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