[Bf-cycles] Motion Blur

Brecht Van Lommel brechtvanlommel at pandora.be
Mon Sep 24 18:22:57 CEST 2012


There was something like a 5% performance drop with only camera motion
blur, and 25% with object motion blur. This is with motion blur
disabled, when it's enabled it's more but that's acceptable of course.
I think the extra code causes some variables to no longer stay in
register but get accessed from main memory instead, which hurts
especially in the main BVH traversal loop.


On Sat, Sep 22, 2012 at 11:54 PM, storm <kartochka22 at yandex.ru> wrote:
> В Сб., 22/09/2012 в 23:27 +0200, Brecht Van Lommel пишет:
>> The main work
>> remaining is to the fix the big performance regression that you get
>> currently when activating it, even when motion blur is disabled
> Hi Brecht!
> I meant that for my taste at least Camera only MB already work, and have
> not found any objection. Can you please elaborate more about that
> regression, as for me it (Camera MB only of course) have tiny overhead.
> Added silly example to forum,
> http://www.fileconvoy.com/dfl.php?id=gea98ff9a86e1763014935353b29a4a83a92d5b
> looks flawless except that 29 30 empty frames, maybe it unrelated to MB,
> my modeling skills as bad as English or worse.
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