animation: flickering geometry

[sunnyc1]

Hi guys

Just having a small problem rendering an animation of 4 towers, the fine details (geometry) such as window frames and louvers tend to render out smaller then 1 pixel therefore flickering occures, we have made as many elements of the architecture maps rather then geometry to reduce this effect. just wondering if anyone here knows if there is a setting to help further reduce this from happening, we might render it out at 2k and or use a post motion blurr to smooth it out but if there is any other way it would be most helpful.



sorry couldn't post a larger image boss didn't even want me to upload it.

The current settings are a 1024 x 576, irr map -3, -2 multiframe with blurr GI 8, lightcache 2000 flythrough and adaptive QMC 2, 7 for aliasing with mitchell filter.

thanks in advance

[jacksc02]

heya sunny!
are the maps procedural? also you might want to turn the blur GI to 0

[Morbid Angel]

i disagree with jack, the flickering is due to anti aliasing as it is geometry related. Few things to try to awoid it/make it better:
1 - do not use sharpening filters like mitchel, rather use quadratic.
2 - qmc aa of 2/7 will not do you any good, 1/4 is enough.
3 - based on many many tests that we have done, we concluded that qmc aa cannot produce that preciasion result required, but adaptive aa can.
Use 0/3 adaptive subdivision with noise thresh of 0.05 and object edges checked. In combinations with quadratic or in our tests even mitchel this should produce correct aa result, however it can result in some heavy render times, so watch out.

[dannyk]

first post

thanx morbid,

I actually just got permission to post in this forum today, had to use my bosses (sunny) account previously.

I will try those settings come monday, hopefully it should be all good, trying 2k renders over the weekend as i didn't read your reply in time.
hopefully your suggested settings will also stop the flicker of the geometry trees.

and hi jacksc02, i am also in syd, i think i met u for like 2 secs b4 when u were in the office... and no there is no prcedural maps, i find they flicker alot more then bitmaps just like geometry.

[dannyk]

i tried the quadratic filter with the 0/3 settings at 1024x576 as you suggested it was better but it seemed to still flicker, i guess the frames were just too thin.

the 2k renders i sent during the weekend had hardly any flickering when i resized them and exported them with a PAL DV setting.

would catmullrom be any better i wonder?

[mike.edel]

well, if you downsize the final 2k renders for output to dv you more or less do the same as a soften filter
(except that its much more expensive in terms of render-time)
you might instead want to blur the offending textures vertically

catmull is a sharpen filter if i remember correctly, so it wont help you much
i'd try different softer filters (video seems to be too soft but area might be ok)
just pick a problematic part of the sequence and render it at the final res (1024x576 = widescreen dv pal?) using different filters

i guess the added rendertime you have by rendering 2k can easily be spent for higher AA settings at dv res