In article <39DDAB0F.7C1182B2@my-dejanews.com>, 
gre### [at] my-dejanewscom wrote:

> Is there a way we could have two functions,
> 
>     1)  one "[-0.5, 1.5] clamped down to [0,1].",  for all the folks
> complaining about their old sky textures,
> 
>     2)  one  based on this raw [-0.5, 1.5] noise,  but
> newnoise=(computersrawnoisefunction +0.5) /2

That is what is done now, though it is controlled with the #version 
directive.
Anyway, two noise functions are not necessary, since you can get the old 
one from the new version(but you can't go the other way, and get 
plateau-less noise from the old kind). Just put a space of solid 
material(color, texture, pigment, etc) at each end of the blend map, and 
squash the existing colors into the middle. I think this is the cleanest 
and best solution, even though it does require changing some older 
scenes.

But if you really want separate noise types, it could be done by 
internally duplicating every feature that uses noise, and using a 
"#noise_type" keyword to tell the parser which one to choose. This would 
be very time-consuming to do, and messy(since it would need two versions 
of bozo, wrinkles, turbulence, etc, etc...), but it would allow you to 
use both types of noise in one scene, and would be the cleanest from the 
user's point of view.
A much simpler way would be a global_settings keyword, but that would 
force everything in the scene to use the same noise type. This could be 
a problem if you are using include files which depend on a different 
noise type.

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

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