[Bf-committers] Blender developers IRC meeting minutes, nov 27 2011

[Sergey Sharybin]

Hi,

On Sun, Nov 27, 2011 at 10:24 PM, Ton Roosendaal <ton at blender.org> wrote:

> - Some reports came in that systems without SSE2 don't run latest
> Blender anymore. Appeared to be in libmv - Sergey will check and fix.
> Blender has runtime support to switch back to non-sse for old hardware.
>
>
Described solution in bug tracker already, but to make things 100% clear.

Made several tests of release builds with and without sse2 support. There
were only few percents difference in camera solver (most probably it's just
measurement "noice" caused by not really 100% accurate methods). Difference
for SAD tracker was a bit more noticeable (~20%) but it still allows to
track several tracks at once faster than double speed of realtime playback
which it totally acceptable (doubt somebody will need to track so fast --
it's just direct way to bad solving if you aren't checking for sliding and
tracking with really high speed leads to re-watching the whole clip which
is also annoying).

Uploaded updated builds to http://download.blender.org/ftp/incoming/ (the
same revision is used as for initial Beta build, just global
sse/sse2 optimization was disabled)

P.S. Don't think switching SAD to runtime-sse-detection model is really
critical, this can be done after release without any harm.

-- 
With best regards, Sergey Sharybin