PDA

View Full Version : Global Illum. problem with animation


barcombpictures
11-25-2007, 12:33 AM
When I animate a scene with Global illunimation in it, I get very random and indiscrete noise or uneven GI distribution moving wildly around my scene. I have messed with all the settings and tried a ton of combos and nothing seems to stop this random sampling problem, any suggestions?

courtneyrocks
11-25-2007, 08:12 PM
Hi there,
I believe in general animating in Cinema 4D with GI is problematic. The flickering random GI samples is something that can't be helped at the moment. Have a dig in this forum and you will find a lot of gripes about it.
If you are just animating the camera change the Global Illumination type from standard to camera animation.
Or you could bake the global illumination into the textures. or simulate GI with the lighting.
Or buy VRAY for C4D.

Good luck.

barcombpictures
11-25-2007, 09:01 PM
Thanks, yeah, Ive been creating adding soft lighting around surfaces to simulate the reflecting photons and ambient occlusion so simulated where light gets trapped in corners with some luck, though the dispersion is never quite as good as GI still images. I was just curious if anyone had found or had known of any work arounds. I would bake it but i have some moving parts that dont look right when i do.

STRAT
11-26-2007, 07:56 AM
the AR is perfectly capable of clean flicker free animation. the biggest problem it suffers from is a cumulative frame render slow down due to a build up of samples.

egselent
11-26-2007, 09:10 AM
as far as i know the only way to garauntee a flicker free gi render in AR is stochaistic mode which takes unacceptabley long to render. We had a huge project last year which included gi interior animations. After many delays and work arounds we finally realised there was no way we could render decent interior animations with GI in the timelimit.

we had to outsource the rendering to a company with MAX/ Vray to get the results we needed. Luckily VRAY is out for cinema now so thats the quickest/ easiest solution if you have the money to buy it. well worth the time saved banging you head off a brick wall if the project pays for it!

STRAT
11-26-2007, 09:34 AM
nope. The AR is perfectly capable of flicker free animation using normal gi camera animation mode rendering.

EDIT

important thing to note - it's only possible rendering from a single computer. you cant render over NET or a network or a render farm and Cinema currently has problems sharing the cached GI file. So yes, it's perfectly and easily done in the AR as long as you dont mind the render slowdown (not every scene slows down of course) and render from a single computer.

Ernest Burden
11-26-2007, 02:01 PM
important thing to note - it's only possible rendering from a single computer. you cant render over NET or a network or a render farm and Cinema currently has problems sharing the cached GI file. So yes, it's perfectly and easily done in the AR as long as you dont mind the render slowdown (not every scene slows down of course) and render from a single computer.

Every scene I've ever tried--interior or exterior--has suffered from the slowdown. And for those that have survived this far without reading any of the previous threads about it, it isn't a small slowdown, its a project schedule/budget busting disasterous slowdown. Its a 'fool's errand' situation trying to do arch-vis GI animation with AR.

You can use a renderfarm, by the way, if it has a way to force the frames to render on one machine. I recently used RenderCore and set up many, many small 'jobs' for individual shots of between 100 and 250 frames each, forcing each to one machine. I had hoped that the relatively short shots would let me sneak my sequences in under the time-accumulation bugs watchful gaze. I was wrong, and it cost me a lot of money, as usual. I should have known better. In the end I did what I always do--baked the crap out of the files and rendered on my own workstation.

NeoGeniX
12-04-2007, 08:00 PM
I hate this horrible bug. I'm having exactly the same problem right now. Now I have to render every frame by hand with render current frame quite a pain but I will get there.

barcombpictures
12-04-2007, 08:08 PM
I hate this horrible bug. I'm having exactly the same problem right now. Now I have to render every frame by hand with render current frame quite a pain but I will get there.

How complicated is your scene? Cause you can fake a GI by adding ambient lights with soft-less-than-100%-shadows where the light would reflect. you could add 1000 lights and not come close to the time it would take to render a good GI. Add if you add a good ambient occlusion, youll get something thats better than GI i think. Good Luck.

(beats rendering each frame manually)

CGTalk Moderation
12-04-2007, 08:08 PM
This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.