"Gilles Tran" <tra### [at] inapginrafr> wrote in message
news:3B5F250E.276DA256@inapg.inra.fr...
> Scott Hill wrote:
>
> > Have you tried a higher pretrace_start setting ? I've found whacking it
> > right up to 1.00 for final renders gets rid of ugly rad artifacts...
>
> Actually all I've been using for a while is pretrace_start = pretrace_end
= 1
> (in Megapov). The strangest thing is that I don't know what I'm losing
doing
> that.
>

    Well, the way I understand it, the rad pretrace settings are similar to
the mosaic preview settings, i.e. they're expressed as a percentage of the
image width... So with start=end=1.00 you're saying "take one sample at the
image width and do no more"... I think... Yeah, I'm pretty sure this
correct - if you set pretrace_start to 1.00 and pretrace_end to 0.50 you'll
see the rad pretrace stage gets down to 'blocks' half the width of the image
before the final pass starts... 0.25 ends at blocks 1/4 of the width and so
on... So, it seems to follow that, for max rad quality you need to set
pretrace_start=1.00 and pretrace_end=1/imagewidth... Having said that, the
'blocks' start getting kind of blurry when they get to around 4x4pixels, no
matter what the pretrace_end setting is...

--
Scott Hill.
Software Engineer.
E-Mail        : sco### [at] innocentcom
Pandora's Box : http://www.pandora-software.com

*Everything in this message/post is purely IMHO and no-one-else's*

Post a reply to this message