"Kenneth" <kdw### [at] gmailcom> wrote:
> [I happen to be working on an animation of my own right now.]
>
> Your 'wip 2' (3840x2160 downsized to 640 X 360) looks *much* better than your
> first wip. So the original problem was not due to the MPEG compression your
> used-- I checked both videos' 'bit rates', and wip 2 is even more compressed,
> slightly. But it still looks quite nice.
>
> I made a screenshot from your wip 1 (see attached.) The window and some other
> parts show 'jaggies'-- as if no antialiasing was used at all, which is quite
> strange. I would have assumed that your aa2 method would have completely
> eliminated those.
>
> Do you still have your original 640 X 360 animation renders from wip 1? Maybe
> take a look at some of those, to see if the jaggies are present there.
>
> As B.E. said, a possible problem is that your scene has very sharp narrow lines
> and tiny details, which can sometimes react badly to aa. (You mentioned that you
> turned off your aa jitter. As a suggestion, try using aa method 1 with a setting
> of zero, and turn ON the jitter. Who knows, it might help! I am currently using
> that set-up, and the final MPEG animation result looks fine to me.)

I don't have any of the original renders, I don't keep them around very long.  I
have been experimenting with various anti-alias options yesterday.  The problem
is definitely due to sharp narrow lines and tiny details.  More than any other
animation I have ever done.  I had never needed to use Antialias_Depth before so
I didn't think to use it. When I added Antialias_Depth it has definitely
improved.  I have attached the last test using +am1 +r7.  Because it is shooting
more rays per pixel it does take longer. With a depth of 1 it take 20 minute,
with 7 it goes up to 90 minutes.   A side effect has been a reduction of the
animation size with higher depth.  With a depth of 1 it was 4.6M,  with a depth
of 7 it was 2.0M. So I should be able to render at a higher resolution.  It
seems that rendering at higher depth is kind of equivalent to rendering at
higher resolution then scaling down. Though maybe without as much overhead. In
both you are shooting more rays through each pixel.  I'm going to try using +am2
next to see what that does.

Clarence

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