"Warp" <war### [at] tagpovrayorg> wrote in message
news:437518f2@news.povray.org
> scott <spa### [at] spamcom> wrote:
>> The problem is, if you apply focal blur as a post process step (as
>> you did), it cannot take into account any surfaces that are
>> brighter than white in the image file.
>
>  Other problems with post-processing focal blur is that it doesn't
> work correctly for reflections nor refractions.
>  Also, true focal blur can add info to the image which is not seen
> in
> a non-blurred image (eg. hidden surfaces can become partially
> visible). Blurring a latter type of image afterwards will not add
> this info, naturally.

Of course, but the in-built focal blur in POV isn't perfect either (no 
aperture shape, finite number of samples).  Which looks the "better" method 
will depend on the scene.  Perhaps the shape of the aperture could be added 
to POV at some point.

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