animation with Brute force and Light cache

[oren]

hey guys
small thing

i have heavy scene with lot of building and vagitation trees and all that... i want to go with brute force because i dont have the time to setup all pre calculation for 10 cameras in the scene

its moving camera only but even when i setup the value to min\max to 1 - 50 and noise threshold to 0.005 i still can see in the far area of the frames kind of flickering or dancing pixel.. my goal is not to handle with flickers and splotches of IRADDIANCE MAP and do brute force and that is it.


if i render moving camera only with brute force and light cache... did i must to save the light cache file before or it can work without flickers also with light cache calculated on every frame?

help please... what the best way for me in scene full of plants and trees ... any video tutorials? the old vray is not the same as 3.4 i guess...

any help will be great!!

thanks

[joconnell]

You might be better off raising your minimum rather than such a high maximum, unless you're rendering motion blur in 3d. Try 2/16 and 0.01 on a version of the scene with a greyscale override material or if you do a test render add in the total light element so you can guess if it's a material or a geometry issue.

[Ihno]

Take a look into the help.
https://docs.chaosgroup.com/display/...Cache+Settings

Scroll down to the end. That allways worked for me.

Btw. At the end is a little hind to turn on "use camera path" if the camera is moving at "relatively small distances". Does that mean we should turn it off if the camera is moving fast and/or at big distances?

[FLP]

Typically it's the lightcache to blame for shimmering/dancing artifacts in vegetation. The defaults of 1000 subdiv/2.0 retrace are not always enough. Try 2000 subdiv/4.0 retrace or 3000 subdiv/8.0 retrace

Are you Denoising? Locked noise pattern?

Cheers,

[thanulee]

Cant say for sure, without a screenshot about ur overall settings, but "use camera path" on at LC and retrace to maximum.
U dont need values more than 2k in LC imo. If its exterior daylight u shouldnt have any flickering whatsoever. In any case, u can see ur flicker in 2 frames alone, so do some quick tests at the hardest parts of ur animation to determine whatsup. Also, static noise disabled, sometimes help with the illusion of flickering when using bf especially in the background.
Keep in mind that its more efficient with scenes like this to use bf, than irradiance with high settings. And ofc, there are denoisers in post as well that help when u bf. Personally i always add a bit of grain in post, to knock out any kind of banding and make it look more filmic/realistic.

ps. ur AA and noise threshold do not compensate for flickering. its usually LC o blame. Its better to go lower on adaptive amount, especially in IM helps a lot to have more fixed rays in ur scene.

[thanulee]

Btw. At the end is a little hind to turn on "use camera path" if the camera is moving at "relatively small distances". Does that mean we should turn it off if the camera is moving fast and/or at big distances?

I always keep it on in any animation. Idk if its right, but didnt do me any harm

[Deflaminis]

Your AA filter can cause this as well... any chance it's the AA?

[Fat Tony]

Hi,

If you use BF + light cache on "fly-through mode" it should all be Ok in terms of GI. I am doing this for quite some time, since there is no more need for IM, and it is actually heavier to blend IM passes then just to clean up BF.

AA unless you have very strong highlights is also not a problem. If you render DOF od motion blur go higher on min subdivs in image sampler, as mention lower. This should work, at least it is in all cases for me.

[thanulee]

Hi,
there is no more need for IM, and it is actually heavier to blend IM passes then just to clean up BF.

As Fat guy says and thats what i meant when i said below, "bf is efficient in this type of scenes comparing to im blending." And as Deflaminis said, be sure u use a blurry instead of a sharp filter. I use always area at 1.5 or even 2.0 in higher than 1080p res.