noisy shadows on matte surface.

[super gnu]

ive got a -very- simple scene... domelight, plane as matte object, and a keyframed sheet of paper blowing across the scene.

the shadows cast by the sheet of paper on the ground plane are horribly noisy in the alpha channel.

ive tied raising msr to 32, and even 64.. ive tried raising the local subdiv multiplier of the ground plane to 20x, and ive tried enabling local subdivs and cranking the domelight subdivs to 400..


all of them clean the noise on the groundplane to some extent, but at the expense of enormous rendertimes.

example: render with the paper looking fine, including any shadows cast on it, but really awful shadows on groundplane: 34 seconds.


render with msr and groundplane subdiv multiplier through the roof, but *still* unacceptably graininess in ground alpha shadows: 15 minutes and counting.


that cant be right.

[super gnu]

ok seems to be a progressive AA issue

if i switch to adaptive, i get a decent clean matte shadow in the alpha even at default settings.

[PIXELBOX_SRO]

I have the same problem but is also when i use adaptive.
Its crazy no matter what i do i cant clean it at all its not reactiong to anything. Even if i use aa 8/10 and noise threshold 0.001 msr set to default 6. And its not actually lit by hdri but the matted shadows are coming from a disc light.
O will post some samples in a new post in the morning.

[Svetlozar Draganov]

Would it be possible to attach example scenes along the result you got into your environment so we could investigate if this is a bug or something else?

[PIXELBOX_SRO]

Hi Svetlozar, i have already sent the scene sample to vlado as per this thread here:
http://forums.chaosgroup.com/showthr...n-alpha-matte)
can you shere the file with vlado please?

[bigbossfr]

Hi,

I have the same problem in Maya (?)

[Miro]

Hi,

I have the same problem in Maya (?)

Can you share a sample scene and the result you're getting on your end to support@chaosgroup.com?

[airion]

hmmm, indeed I also have something similar going on with my shadow passes, i've emailed the scenefile and output to support.
Fingers crossed

[Art48]

I also have these issues. Doesn't make sense to send another scene in my opinion. I can get a clear shadow by experimenting with the settings ending up somewhere around 1/30 and 64 or even 128 MSR. If I go higher it gets noisier again. It is not a perfectly noise-free shadow I get but acceptable.

[vlado]

This is already fixed in the nightly builds and for the next service pack.

Best regards,
Vlado

[Art48]

This is already fixed in the nightly builds and for the next service pack.

Best regards,
Vlado

Good to know, thanks for the notification!

By the way - is there somewhere we can see what is planned for the next SP?

[vlado]

By the way - is there somewhere we can see what is planned for the next SP?

Nope However we plan to do a public beta around the end of October, like we did last year.

Best regards,
Vlado