In article <3A6### [at] onlineno>, Tor Olav Kristensen 
<tor### [at] onlineno> wrote:

> > camera{location 2look_at 0}light_source{9,1}height_field
> > {pattern 99,99{mandel 9 color_map{[0 rgb 0][1 rgb 1]}
> > scale.3rotate-x*90translate.5}pigment{bozo}}
> 
> Using patterns for heightfields is new to me.
> MegaPOV feature ?

Yes. And I think the keyword really should be "pigment_image", not 
"pattern", since it takes a pigment (well, pattern and color_map) and 
produces an image from it. The two numbers before (?!?) the { bracket 
specify the resolution of the image, pigment stuff goes inside the 
brackets, and I think you can use it pretty much any place that uses an 
image file.


> I wonder why there are such basic functions 
> missing from the POV-language.

They were just overlooked or didn't seem necessary...another missing 
function is "sgn()", which would return -1 or 1 depending on the sign of 
the parameter. (I've patched that one into my own version.) But people 
have gotten along for a long time without them, and now that they can be 
done easily with macros, there isn't a lot of demand for them to be 
added to the program itself.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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