how to get rid of the pattern in the area shadows?

[victorwol]

Hi! Any way to get rid of the pattern on the area shadows? I know more subdivisions will probably make it better, but I'm not sure if I'm going the right direction, because I almost got rid of it, but render time went over 1.5 hrs a frame....

[vlado]

Which pattern? You mean noise?

Best regards,
Vlado

[joconnell]

Stick up a frame showing the problem and we'll give you a better idea. I'd also recommend turning on the vray frame buffer and adding in the following render elements:

VrayRawLighting
VrayRawGlobalIllumination
VrayRawReflection
VrayReflection
VraySpecular
VrayMTLReflectGlosiness
VraySampleRate

As you can use those to quickly chase down where you've got noise and what's possibly causing it. Is that Victor Wolanksy of syntheyes fame by the way?

[victorwol]

Which pattern? You mean noise?

Best regards,
Vlado

Yes, the noise in the area shadows..... it forms a pattern that is very visible when have surfaces with not a lot of texture, like a wall with plain paint, it does not bother in a still, looks like grain, but when camera moves you can see the pattern staying in there not changing at all, makes it feel very weird...

[victorwol]

Stick up a frame showing the problem and we'll give you a better idea. I'd also recommend turning on the vray frame buffer and adding in the following render elements:

VrayRawLighting
VrayRawGlobalIllumination
VrayRawReflection
VrayReflection
VraySpecular
VrayMTLReflectGlosiness
VraySampleRate

As you can use those to quickly chase down where you've got noise and what's possibly causing it. Is that Victor Wolanksy of syntheyes fame by the way?

Thanks! Yes, it is me..... doing a big job for Coke this time, and chosen Vray this time around... so I'm sort of like training myself 24 hrs a day ))))

[Neilg]

If you go to the DMC sampler settings you can switch off 'time independent' - it makes vray use a new noise pattern for each frame and removes that sliding pattern you get.

[victorwol]

Thanks! I did a little test and was under the impression that I was getting more GI flickering... is this possible? I'm not using brute force...

[victorwol]

here are some images, not sure how to understand them though.... looks like the GI does not have enough resolution ion some places?

Not a lot of noise on this one, but a huge cost in rendering time.

DMC Sampler is set to Adapt .85 Noise 0.001 Min Samples 16

[victorwol]

I also noticed that if instead of lowering the noise threshold in the DMC so much, lets say I raise the light subdivision to 128, I go down from 6 minutes to 2 per frame, with a much better result than the previous noisy 2 minutes render, but not as good in the low lights parts as the one where I lower the DMC....

But one thing I'm not sure I understand is why when I raise the subdivisions on the light, the general scene becomes brighter???

Thanks for your help to all of you.... saving my a......

[Donald2B]

Read this thread. It will greatly help you with the various methods of cleaning out noise without killing render times! It is a must read for everyone in my office! http://forums.chaosgroup.com/showthr...ng-DMC-Sampler

[victorwol]

Thanks! I've seen it... I'm reading it and reading it again trying to understand all in there...

[Donald2B]

Yep, I've read through it at least 7-8 times and still getting more from it. It's a LOT to take in and absorb!

[joconnell]

Heya Victor,

First things to have a look at is the override bits in the global switches section of the vray tab in the render dialog. You'll be using the override material and using some of the light on / off toggles. Then the vray frame buffer with the elements listed above and try running through this workflow:

http://forums.chaosgroup.com/showthr...933#post573933

[Neilg]

The GI issues you have on the edge of the fridge door hint at some double faces/backwards normals - have a look into that and see if that clears that up. It's barely visible in the base, but worth fixing.