Compositing buildings and trees in animation

[kwok3d]

I'm trying to render this animation here in 2 passes (building and trees)and composite it in AE. I don't think i'm doing this right. here are the step i took, please check and give me some advice.

1) When rendering the proxy trees (Yes, proxy), I put matte on the building with GI-gen off. took 8 mins with DR! thanks god, it comes with artifact too! (the yellow outline thinging)
2) Render buildings without trees. 4mins.
3) Then i put them together in photoshop, check out how ugly it is below on the 1st image. Then I render out the buildings AND trees together took about 6mins ONLY without DR (image attached was render w/DR)

For all these rendering, i use IR and LC, AA=QMC(catmull). This is the 1st time i'm trying to do compositing, please let me know what i did wrong, thank you!!

:k

[jonnybefree]

did you render before white?
it has to be always black, and maybe this could help:

http://www.chaosgroup.com/forum/phpB...ic.php?t=14724

[lukx]

yep, redner on black background and save your tga with pre-mul checked.

[kwok3d]

it works but now...

that seems to fixed the problem. now, i'm have another problem... the trees. look at how dark and solid the tree's shadow has became. i render them out in matte with the background all GI off. any suggestion to get it fixed? Any other tips on doing some projects like this? i dont know much since this is the 1st time i'm doing this. anyway, thank you two so much!!

:k

[panthon]

You can render on white and premultiply by white in post. It would be about the same.

[kwok3d]

tree pass

at the same time i'm worrying about the shadow, i also try getting rid of the flicking. i have try everything and it seems like the VeryHigh setting works very well but takes 5-8 mins per frame (crazy) and the High setting takes 1.5 mins with still a bit flicking but it's a fair deal. bty, i did the test with every1 multiframe and i will try every30 and every10 or even 5. geez... deadline's on monday

VeryHighSetting
http://www.renderthis.com/temp/vray/...ighSetting.mov

HighSetting
http://www.renderthis.com/temp/vray/...ighSetting.mov

[animagic]

It doesn't look that bad, I would add some motion blur in post to the trees and building.

[kwok3d]

AE motion blur

in fact, I have just figured out how to fake the motion blur in AE. this will definetly help reduce flicking. I have just rendered out a few tree frame with every 30th irmap, the result is somewhat acceptable. i will do one with every 10th and see if it's worth doing. here is the AE motion blur, what a time saver.

http://www.renderthis.com/temp/vray/...motionBlur.mov

[panthon]

In my experience, to reduce trees flickering, u must get rid of adaptive qmc and use adaptive subdivision instead min rate=0, max rate=2 and threshold= 0.01


in the qmc sampler section, noise threshold to 0.001.

Another solution, sometimes faster, is rendering doubling the frame size. It will avoid most of the noise with faster renderings. It seems to be a contradiction, but if you get too high with your settings with your usual frame size, you rendertimes will go extremely high. With a higher resolution, you can safely lower your antialiasing settings.