I enquired recently about the non functional +sf and +ef options in
povray-3.8.0-beta.2.

Turns out I should have explored it more and not just for the single case where
it initially affected me.

The command line options work fine EXCEPT if one wants the first frame of the
animation. +sf0 +ef0, seems to render the whole sequence.

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hi,

"Paul Bourke" <pau### [at] gmailcom> wrote:
> ...
> The command line options work fine EXCEPT if one wants the first frame of the
> animation. +sf0 +ef0, seems to render the whole sequence.

confirmed (alpha.9945627).  fwiw, the options do work when using an .ini file.


regards, jr.

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On 10/24/25 03:46, jr wrote:
> hi,
> 
> "Paul Bourke" <pau### [at] gmailcom> wrote:
>> ...
>> The command line options work fine EXCEPT if one wants the first frame of the
>> animation. +sf0 +ef0, seems to render the whole sequence.
> 
> confirmed (alpha.9945627).  fwiw, the options do work when using an .ini file.
> 
> 
> regards, jr.
> 

The subset frame options - like the per frame, image, column and row 
subset options - 'support' percentage specifications. At best the pct 
feature causes confusion; at worst there are bugs, like when trying to 
render only the top row of an image.

I "think" all of the bugs are fixed in the yuqk fork, but my proposal 
for v4.0 is to dump the percentage specifications. In any case they 
should not be layered upon the normal by 'frame number/row/column' flag 
and option names.

If later, with v4, we decide the percentage specifications are needed 
these should be implemented with their own flag and option sets 
(something like: +sf_pct, etc).

Bill P.

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hi,

William F Pokorny <ano### [at] anonymousorg> wrote:
> On 10/24/25 03:46, jr wrote:
> > "Paul Bourke" <pau### [at] gmailcom> wrote:
> >> ...
> >> The command line options work fine EXCEPT if one wants the first frame of the
> >> animation. +sf0 +ef0, seems to render the whole sequence.
> >
> > confirmed (alpha.9945627).  fwiw, the options do work when using an .ini file.
>
> The subset frame options - like the per frame, image, column and row
> subset options - 'support' percentage specifications. At best the pct
> feature causes confusion; at worst there are bugs, like when trying to
> render only the top row of an image.

"in one" as usual </grin>.  had not thought about the percentage notation, but:
  $ pov38 ... +sf0.0 +ef0.0
does work as per PB's intent.


> ...
> If later, with v4, we decide the percentage specifications are needed
> these should be implemented with their own flag and option sets
> (something like: +sf_pct, etc).

agree that distinct names should be "the way forward".


regards, jr.

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