On 1/18/24 07:12, William F Pokorny wrote:
> Aside: the global_settings{} block can be used multiple times too, but 
> not everything can being updated once it's set.
> 
>    global_settings { assumed_gamma 1 radiosity{} }
> ...
>    global_settings { noise_generator 3 } // This OK
> ...
>    global_settings { assumed_gamma 2.2 } // This ignored. Warning issued.

Mentioning the bit aboce got me thinking again about global_settings{}s. 
There are things with it too which should probably change in any v4.0.

- Maybe it should only be allowed a single use in any given scene for one.

- The global noise_generator settings is deceptive because it's mostly 
not true. The setting affects some inbuilt patterns, but not much else. 
And that global noise generator setting is problematic to any global / 
library ecosystem of include-able stuff. Work up a good agate base 
texture with the default noise_generator(a), hand it to a user who has 
changed the noise generator in their global_settings{} and that texture 
will behave differently...

- If not single use limited there are settings which should act like 
assumed_gamma in not allowing settings to be changed, which today do 
allow settings to be changed...

- In official POV-Ray releases where using subsurface that 
global_settings block needs to be specified once at the top (closely 
following #version). There's a related github issue still open.

   https://github.com/POV-Ray/povray/issues/122

- The irid settings should likely be pushed into the irid feature.

Anyhow. :-)

Bill P.

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