Motion blur subdivs ( physical camera)

[igordesign]

Hi friends, i'm using vray 3.1 and i remember that older version of vr-ay for maya have a separated subdivs for motion blur on physical camera, but on 3.1 i can't find it.
Someone can help me?
Thanks

[ivaylo.ivanov]

The subdivision for the motion blur were removed in V-Ray 3, you don't need to care about them any more.

[igordesign]

Thanks ivaylo.ivanov!

I need to set a quality of m. blur on "image sampler" tab correct? I'm using adaptive.

Normaly i set image sampler first, second i set lights subdivs and after i set shaders subidvs.
now in 3.1, i need to turn m blur on, to set it first with image sampler right?
Sorry my english

[Komposer]

Igor, thats correct what You said.
Take a look on these side: http://cggallery.com/tutorials/vray_optimization/ (for me the best I´ve seen after years with Vray)
At the end of the fist chapter "Raytracing 101" You can see, that:
"Primary Samples = The samples controlled by V-Ray's Image Sampler (also known as Anti-Aliasing or AA), which is specialized in sampling a scene's Geometry, Textures, Depth of Field, and Motion Blur."
Here are all infos You need to get a nice and noiseless render result, without blind shooting samples over all...
Check the other tuts too, there You can find a DMC calculator for a bit better understanding.
And look at this: https://www.youtube.com/watch?v=YuDvZvgPZng (perhaps its the same guy?)
At min 42 he speaks about your Question...
At 1h he speaks about the optimization prozess, You´ll find under the fist link too...
..hope that helps a bit
(for me, after years with Vray DMC, the first light at the end of the tunnel

[Svetlozar Draganov]

Yes in V-Ray 3.x the quality of Motion Blur and Depth Of Field is controlled by the Image Sampler.

[igordesign]

Thanks friends! Thanks for your time to help me, i'm trying it!

[igordesign]

Hello friends, I'm trying to do my scene conforms your helps, it's very nice and very smooth noise, but the render time is a very high for my job. The frame on the image bellow is rendered in about 4 hours on a intel Xeon W3670 cpu.
If possible You can look at my scene to verify if i make an incorrect settings? or if is all right and the render time is normal?
Thanks friends!

SCENE ZIP FILE: https://drive.google.com/open?id=0B6...zI2RWV3X0dNZ2s

[ivaylo.ivanov]

I've sent a request for the file. 4 hours look really too much for a standard geometry

[igordesign]

Sorry, I did not know that google drive, it was necessary authorization to download the file, but I have done the authorization.
I upload the scne on MEGA too. here is: https://mega.nz/#!HIIGmDLQ!EFoFpMueS...ddufhUK5xQFXcs

Thanks

[ivaylo.ivanov]

I think the easiest optimization you can do is to let V-Ray handle the subdivisions. Your subdivs settings are very high and the problem is that you don't really know where you need them. For example, you may calculate the perfect reflections for something that is barerly visible when motion blured. Try setting Render Setitngs/VRay/DMC Sampler/Subdivs Mult to 0.0 to let V-Ray automatically handle this. You can also increase the "Min Shading Rate" from the Image Sampler (this is another 3.0 features). You should be able to get something like 2.5-3 hours I think. The next SP will have new adaptive sampling to handle this stuff more easily, so people will hopefully not have to deal with subdivs settings at all, but control the quality via tolerated noise.

[igordesign]

Hi ivaylo.ivanov , thanks for your time to help me, i tryied this setting on last night and the time is nice for me. I watched the Vlado's tutorial on youtube https://www.youtube.com/watch?v=tKaKvWqTFlw
The rendertime now is down to 2h40 min. on a critical frame, my old setting are 4 hour. But i have a little noise in my images, but in play, it's not perceptible and good for me.


I appreciate your time and patience of all friends here forum. I intend to participate fairly and if possible also want to be able to help other participants of this forum ..

[Komposer]

hi Igor,
I made some tests today, and I can say that I´m not realy happy...
...but rendertime is now 1h50min and it looks realy nice for me.
(for me, nearly 1h50 are very long too, and I´m not shure if an expert can save more...)

I rendered "only" renderlayer FAN, and then...
...I put it on a simple white back in post.
I made an upload with mb (2015) scene.
https://www.hidrive.strato.com/lnk/BKBUxGkC
When You whant it, I can send link to ma.

...perhaps interesting for the future.
Cheers, Jo

[Komposer]

btw

I´ve a six core too...I3930K...
perhaps a bit slower than Your´s!?

[igordesign]

Hi Komposer! thanks for help me, you can upload a .ma file? I'm using maya 2014
Very nice result that you got!

[Komposer]

https://www.hidrive.strato.com/lnk/rMB0RI6u
..here it is.
Hopefully it helps...