GI Animation flickering please HELP!

[OZRAY]

Hi VRay masters!

I have a problem rendering my animation...
I need to render 3500 frames but right now my setting generate
garbage. At many place in the animation I have gi that dance in building corner!

Im sure that someone here can tell me how to fix this.

My settings are pretty standard:
File size for render:640x480
Rendering on the farm with 8 machines throw backburner.
Irradiance is calculated by frame, is it ok?
With those settings Im currently at 1min25/frame so please I don't want
to go more then 2min.

RENDER SETTINGS ---> LINK HERE

IMAGE WITH THE PROBLEM (5 frames) ---> LINK HERE
In this 5 images you can see the problem in the edge of the building
where the wall meet the ground. I have this on many place in the animation.

Thanks helping me!

[MoonDoggie]

Preliminary Questions: Do you have any objects or lights animated in your scene?

[percydaman]

that might be more of a geometry or AA thing.

[sea2stars]

I'm far from a master, but have your tried setting your Irradiance Map to a Min/Max rate of -6/-1? It shouldn't add much time to your calculations.

[brian451]

it doesnt look like you're using a saved ir map or light cache....you can not render an animation in single frame mode without flickering

[OZRAY]

MoonDoggie --> Yes there is animated cars on the road.

Percy --> Do you think it may be a good thing to use AA ? (slower to render ??)

sea2stars --> Thanks I will try it to see.

briant451 --> Your right I was using single frame mode...
If you have animated object you can use something else then single frame mode ?
It's possible to render the IRR and LC with multiple rendernodes in backburner? Or it have to be calculated on one computer only ?
Im a bit in a rush to get this done, can you just quickly point me out what to do please?

- Settings IRR and LC to animation (prepass) and Fly through mode.
- Save file.
- Start animation on the farm and load the saved IRR and LC for the render.

Thanks to help me guys!

Ragards.

[percydaman]

okay, if your using single frame, then thats most likely the culprit. If you haven't yet, get the new 1.5 sp1 and use the new animation modes, that blends the irradiance map across frames to smooth out the irmap flickering/noise.

[OZRAY]

I hope that there is another fix for the moment.
Im in the final stage of the project and I want to pass from 1.5RC5 to Final after that project... Don't want to take chances at the moment...

But I will retain that and upgrade my farm as soon as my project is completed.

Regards,

[MoonDoggie]

My question was to see if you needed to use the new animation mode available in 1.5 (Mode: Animation (prepass) and (rendering)). Since you do have moving objects, you'll have to go with a brute force approach (QMC). Anyone else have other suggestions?

[Da_elf]

i might be mistaken but i think the animation feature in irradiance map was introduced in rc5

[OZRAY]

Your right Da_elf I have it in RC5.
So I putted High Animation and I still get some spot that are moving in the shadows... But this is less then before.

[Da_elf]

i dont mean animation preset. see where it says the irradiance map is being calculated singe frame? check that drop down list for the two animation settings. you still have to calculate an irradiance map for each frame however your GI wont flicker when you render and you can also use lower faster settings

[andrewjohn81]

I think this topic would be great for the guys at Chaos to do a little tutorial on. The animation topic there is great, but I'd like to see one for a scene where everything is animating. And if needed, a different tutorial to show what to do in the same situation, but where most everything is a white material. Seems like some GI methods have a tougher time with that.

Most things I've seen are for architecture and I'm just animating a product. But with things opening and closing all the time it's quicker for me to submit one thing to the farm and move on to the next thing even if the frame might take an extra 15% of time or something. That might be significant if you are making a 2 hour animation, but for 1-500 frames per job it's really not that significant, especially when I could just work on the next job while I wait for the other to render.

If not them, maybe make this into a sticky or something.

[^Lele^]

With those frame sizes, and outdoors + many moving objects, my bet is that a DMC GI would work best.
Setting up helper objects and passes for many objects, checking and comping the whole scene might in the end take up much more time than a straight, and correct, Brute Force approach.

[andrewjohn81]

IR in animation mode with DMC, or just straight DMC for Primary and Secondary.