animation problem -flickering objects with volume light

[odina]

Can anyone give me some suggestions how to avoid these flickering objects in my animation???
I already tried different things :
increase the max vol. light sampler to 100%
increase the AA settings (adaptive -1/2)
increase hemisphere subd. (40) and interp. Samp (30)...

I expected that I wouldn't be able to kill all the flickering of the displacement foam, but I would like to know why the other objects still appear this way...
http://www.artsinteractive.de/Komp1_1.avi

[GoncaloP]

40 hemisphers doesnt seem good enough, but what are your irradiance map settings?

Gonçalo

[odina]

Well I used the low preset for the irradiance map I think it would be ok for that resolution.
I rendered that image image with 20 hemisperes so I thought 200% would be enough ... the true problem is, that I already reached the absolut limit in render time with these settings ...

but if you have any ideas/better workaround for that let me know,
thank you !

odina

[GoncaloP]

I think that you will need to use at least the medium animation presets if you want to avoid the flickering, but you may try it with medium presets instead, probably will help some

Gonçalo

[odina]

hmm right now Iam thinking about rendering with 2 layers, but vray is including the vol.light in the GI so that it would look different if I would seperate the volume light I guess...:-/... and as far as I can see I can't
exclude the volume light (an extra free direct light) from GI...
but thank you Gonçalo! (I will try it if I am able to reduce some other parameters instead)
odina

[marc]

Hey Odina

I know the darn problem with rendertimes... And there is another way: undersampling. You will loose the sharp gi details, but rendertimes will be acceptable. But in a dark iamge like this, that doesn't matter, I think.

Try to raise your interpretation samples to something like 50. If there are still some splotches, just raise em again...

I used this technique for an interior anim of a thai arways plane. Rendertimes dropped from 3.5h (gi med,sph60,int20) to 15min (gi low,sph30,int100)... And if you use incremantal add on every 10th frame rendertime will drop again: ~6min per frame... So maybe its worth a try


marc

[odina]

Hello Marc,

that sounds good even if add incremental won't work in my case (because of the animated volume light I guess )
I'm gonna try it as soon as possible-
thank you very much .

odina