"Bald Eagle" <cre### [at] netscapenet> wrote:
> "Clarence1898" <dle### [at] comcastnet> wrote:
> > I've made a few minor changes to smooth the camera path.  I'm still unhappy with
> > the flickering.  I've read a few articles, but the only methods that apply to
> > povray was to disable jitter(which is already disabled), increase anti-aliasing,
> > render at larger resolution then downscale, and reduce detail. There are 1501
> > frames in the animation.  At that size the resolution that fits within the 5M
> > post limit is 640x360. Since I distribute the renders across 3 PCs I made sure
> > that all renders are done on the same environment. After a little experimenting
> > with anti-aliasing, the best result was using +a0.0 +am2. I tried 3 resolutions:
> > 640x360, 1920x1080, and 3840x2160, downsizing the latter to 640x360.  The
> > 640x360 version flickering is pretty bad.  the 1920x1080 is better but still not
> > great.  The 3840x2160 is quite a bit better but does not eliminate the flicker.
> > The main problem with rendering at higher resolution and then downscaling is a
> > dramatic increase in render time.  The 640x360 takes under 20 minutes, 1920x1080
> > just under 2 hours, 3840x2160 over 7 hours.  Before reducing detail are there
> > any other suggestions I can try?  I have posted the 640x360 version with this
> > post.  I'll post the downscaled 3840x2160 version in the following post.
>
> Well Boss, I'm not going to say that I understand exactly what the problem is,
> but I will throw a few things out there.
>
> fwidth.  Look it up, play with it.  It's a way to do some amazing things.
> I you find my spiral pattern, it's only 6 lines of code.
> But it doesn't show anything recognizable without that fwidth function.
> And then it's amazing.
>
> Read this article:
> https://bgolus.medium.com/the-best-darn-grid-shader-yet-727f9278b9d8
>
> I'm not saying that it's going to totally fix your problem, but there's a lot
> there for serious POV-Rayers to think about and benefit from.
>
> Perhaps use some different ant-aliasing settings, and search for comments by
> Alain and clipka.  doing a very deep, fine antialiasing might be better and
> faster than doing huge time-consuming renders and then shrinking them down.
> I have opined in the past that we should have some nice antialiasing macros to
> help sort out all of the different modes and options.   Maybe you can look into
> coding a first draft.
>
> ffmpeg has some great settings for chopping down the file size yet keeping the
> video quality the same.
>
> Look into mip-mapping.  Don't know exactly what it is, or how to use it, or if
> we can do that in POV-Ray.
> I do believe that Martijn Steinrucker of Art Of Code youtube channel might cover
> it in his "The Drive Home" series
>
> https://www.youtube.com/watch?v=WrxZ4AZPdOQ
>
> Also:
> https://alvyray.com/Memos/CG/Microsoft/6_pixel.pdf
>
> In summary, I think that there must definitely be a [good] way to get rid of
> your flickering - we just need to find out what it is.
>
> - BE

Wow.  Thanks for all the information.  It will take me a while to digest all of
this.  It all looks very interesting.  I'll probably start with examining
anti-aliasing closer.  Again thank you very much.

Clarence.

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