 | | | Subject: flicker amd drop out | Subject: flicker amd drop out 2005-07-05 - By Bright, Jason
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A suggestion when you're dealing with thin geometric features that pop and
alias --- force on rapid scanline rendering (doesn't matter if you are using
motion blur or not). "ray3 -scanline rapid -shutter 0"
It uses a totally different tesellator and behaves MUCH better with small
features. More in the style of prman. Has saved my butt a number of times.
A lot of the time it's worth keeping this on as a default unless bad things
start to happen (it can still occasionally freak out on time or memory if
you have the right scene).
(If you were silly enough to pay to see Catwoman [my apologies] - there is a
shot that pushes through a building that had mirror windows with all these
really tiny modelled features around the glass panes. You'd think it was
simple, but that would not render at (3,3) without bad aliasing and hours a
frame. Turn on rapid and it came out perfect in a few minutes).
This only helps if your features are real geometry --- if they're coming
from textures then thats a whole other issue.
j
-- --Original Message-- --
From: owner-xsi@(protected) [mailto:owner-xsi@(protected)] On Behalf Of
kim aldis
Sent: Wednesday, July 06, 2005 7:44 AM
To: XSI@(protected)
Subject: RE: flicker amd drop out
I'm working on architectural shots right now, probably the worst anyone's
likely to get for aliasing. I'll keep you posted and if you want to nudge me
in a couple of weeks then that's fine, but for this kind of work I'm pretty
sure:-
min/max: 1,2 or 2,2. at 1,2 set threshold to around 0.1, less for fine but
contrasty detail is probably not going to get you much and at 2,2 the
threshold is irelevant. And Chris is right, turninng on dithering will amke
a big difference.
__ __
From: owner-xs[ i@(protected) [mailto:owner-xsi@(protected)] On Behalf
Of Chris Marshall
Sent: 05 July 2005 16:30
To: XSI@(protected)
Subject: Re: flicker amd drop out
Lawrence Chandler wrote:
II had my aliasing settings at 0 and 2 with the default threshold and .the
Mitchell filter. I did a quick test of Chris Marshall's suggested settings
(thanks Chris) and there was a definite improvement but still noticible
tearing with that chaser light effect on many edges. Do I try a higher
threshold or min max setting?
Thanx in advance,
LC
You need to play with this, but a lower threshold, maybe .025, and maybe a
min max of +1,+3.
Try changing the min max first.
Like Kim said, architecture is always a pain!
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<DIV><SPAN class=546573600-06072005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=546573600-06072005><FONT face=Arial color=#0000ff size=2>A
suggestion when you're dealing with thin geometric features that pop and alias
--- force on rapid scanline rendering (doesn't matter if you are using motion
blur or not). "ray3 -scanline rapid -shutter 0"</FONT></SPAN></DIV>
<DIV><SPAN class=546573600-06072005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=546573600-06072005><FONT face=Arial color=#0000ff size=2>It
uses a totally different tesellator and behaves MUCH better with small
features. More in the style of prman. Has saved my butt a number of
times. A lot of the time it's worth keeping this on as a default unless
bad things start to happen (it can still occasionally freak out on time or
memory if you have the right scene).</FONT></SPAN></DIV>
<DIV><SPAN class=546573600-06072005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=546573600-06072005><FONT face=Arial color=#0000ff size=2>(If
you were silly enough to pay to see Catwoman [my apologies] - there is a shot
that pushes through a building that had mirror windows with all these
really tiny modelled features around the glass panes. You'd think it was simple
,
but that would not render at (3,3) without bad aliasing and hours a frame. Turn
on rapid and it came out perfect in a few minutes).</FONT></SPAN></DIV>
<DIV><SPAN class=546573600-06072005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=546573600-06072005><FONT face=Arial color=#0000ff size=2>This
only helps if your features are real geometry --- if they're coming from
textures then thats a whole other issue.</FONT></SPAN></DIV>
<DIV><SPAN class=546573600-06072005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=546573600-06072005><FONT face=Arial color=#0000ff
size=2>j</FONT></SPAN></DIV>
<DIV><SPAN class=546573600-06072005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma size=2>-- --Original Message-- --<BR><B>From:</B>
owner-xsi@(protected) [mailto:owner-xsi@(protected)] <B>On Behalf Of
</B>kim aldis<BR><B>Sent:</B> Wednesday, July 06, 2005 7:44 AM<BR><B>To:</B>
XSI@(protected)<BR><B>Subject:</B> RE: flicker amd drop
out<BR><BR></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=578184121-05072005>I'm working on architectural shots right now,
probably the worst anyone's likely to get for aliasing. I'll keep you posted
and if you want to nudge me in a couple of weeks then that's fine, but for
this kind of work I'm pretty sure:-</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=578184121-05072005></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=578184121-05072005>min/max: 1,2 or 2,2. at 1,2 set threshold to around
0.1, less for fine but contrasty detail is probably not going to get you much
and at 2,2 the threshold is irelevant. And Chris is right, turninng on
dithering will amke a big difference. </SPAN></FONT></DIV><BR>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid;
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<FONT face=Tahoma><FONT size=2><B>From:</B> owner-xs<SPAN
class=578184121-05072005><FONT face=Arial
color=#0000ff>[ </FONT></SPAN>i@(protected)
[mailto:owner-xsi@(protected)] <B>On Behalf Of </B>Chris
Marshall<BR><B>Sent:</B> 05 July 2005 16:30<BR><B>To:</B>
XSI@(protected)<BR><B>Subject:</B> Re: flicker amd drop
out<BR></FONT></FONT><BR></DIV>
<DIV></DIV>Lawrence Chandler wrote:
<BLOCKQUOTE cite=mid001a01c58173$99b14180$6400a8c0@(protected)
type="cite">
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<DIV><FONT face=Arial size=2>II had my aliasing settings at 0 and 2 with
the default threshold and .the Mitchell filter. I did a quick test
of Chris Marshall's suggested settings (thanks Chris) and there was a
definite improvement but still noticible tearing with that chaser light
effect on many edges. Do I try a higher threshold or min max
setting?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Thanx in advance,</FONT></DIV>
<DIV><FONT face=Arial size=2>LC</FONT></DIV>
<DIV> </DIV></BLOCKQUOTE>You need to play with this, but a lower
threshold, maybe .025, and maybe a min max of +1,+3.<BR>Try changing the
min
max first.<BR>Like Kim said, architecture is always a pain!<BR><BR>---
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