shadow/reflection flicker in product shot animation

[mike_kennedy]

haven't read every post , but in QMC, what are your Adaptive amount settings?

[DaForce]

0.85 from memory. (for his scene)

[RErender]

maybe GI caustics?

[DaForce]

Affect shadow wasnt even on in his scene so they wouldnt be there.
Turning on affect shadow made it a fair bit better tho.

[highpoly]

OK..well..good news is, flicker gone! (woohoo). but at the expense of 4 times longer render and noise in shadows now. The caustics are weird too. For comparison here is the orig movie with STORE IR ON in the lights. Terrible flicker but some ok GI caustics. Be warned..its nasty

http://www.geocities.com/highpoly/BLOG/flicker-orig.mov

Here is the latest version with STORE IR OFF

http://www.geocities.com/highpoly/BL...IR_map_off.mov

The settings for latest were as follows...
-2 vray lights, store OFF, 12 samples
- Image sampler: adapt subs 0/2 (since big white areas in scene)
- GI: QMC/NONE (i figured since open to environment and little second bounce anyway)
- rQMC 0.85/0.001/16/2

Any idea on how to get some decent GI casutics back and lesson noise without it taking 20 times longer to render? do i need something in second GI slot?
thanks!

[highpoly]

forgot to add..
the orig clip was STORE IR on in lights and IR/QMC..slighly lower rQMC settings (0.85/0.002/8/1)

[DaForce]

For caustics use Vray: caustics, and setup a direct light specifically for casting caustics. That way you have nice control over them, and it wont impact your renders too much other than calcing the caustics each frame.

Have a look here for a nice and effect way to setup caustics for a scene exactly like yours.
http://www.chaosgroup.com/forum/phpB...force+caustics

And here for a scene of mine with caustics going thru a glass cup. Might have some helpfull info for you
http://www.chaosgroup.com/forum/phpB...ight=glass+cup

Your latest update certain looks ALOT better

[highpoly]

thanks DaForce..i will def check those out! : )

this latest render with Store OFF and IR/QMC is coming out great! I am using QMC AA 2/4...i will post when its done..looks the best so far!!

[highpoly]

Almost there! this one looks by far the best, but still some small issues...
namely no caustics and small flickering in the shadow where the glass metts the floor, although that might be caused the the water which seems to never settle completely (real flow problem there). I wonder if raising my IR map settings a bit might help with the small flicker and the caustics??

http://www.geocities.com/highpoly/BLOG/cups-IR-QMC.mov

here are the settings as of now..

2 vraylgihts 16 subs, store OFF
Image sampler QMC 2/4
GI = IR/QMC
IR map = -3/0, 25 Hsph, 0.4/0.4/0.1
rQMC sampler 0.85/0.002/8/1

DaForce - took a peek at those caustics links....cant wait to try them.. those glasses you did are unreal! the caustics look insane!

[DaForce]

Hey man, looks heaps better!!
MUCH smoother.

Have a look at this link, may help you abit
http://www.spot3d.com/vray/help/150R...sinterface.htm

Other than that, i think the realflow mesh may be the main issue.

And stick some caustics in there.. would look great!!


insane caustics.. yeah the build I originally caused the caustics to be insanely crap.. as there was a problem with that build, but as you can see later in the thread 2nd page I think, I got an updated build and the caustics were nice and sharp