Michael Goldshteyn wrote:

> In the focal blur demo file, focalblur.pov, if you set the aperture value to
> 20, you will notice, if you look at the blurred yellow shape at the top of
> the image, that it has hard corners, even though it is blurred. It's as if

...

AFAIK, it's in the design. (correct me if I am wrong).  The shape
of the "sampling beam" is a square, which thus tends to produce
orthogonal artefacts.

It can be corrected rather easily (it has been done in a lesser known
patch), along with adding the "bokeh" effect, but it's not the time
for such changes.

Fabien.

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