Noisy Hdri

[nomads]

Hi

I am doing an animation with lots of moving objects in a white space.

I am trying to avoid using GI. My scene is lit using a dome light and an HDRI map. The HDRI map I am using is blurred and reduced in size.

My renders are coming out noisy. I've tried raising the light subdivisions to all the way to 300 - it does help a little but its not fixing the issue and the render is crawling. My DMC sample settings are min 1 max 100.

In desperation I have experimented by go down the irradiance gi method. The tenders come out smooth.


In Vray is it possible to get a smooth HDRI lit scene rendered in a timely manner with out GI?


Any tips please

N

[Dariusz Makowski (Dadal)]

You must have overdone some setting.

Try DMC 2/16. Noise tresh 0.005-0.010

HDRI at 128-256 what HDR is it? Night/day/many light sources?

Thanks, bye.

[nomads]

Hi DADL

Thanks for getting back to me.

Ive attached an image of the render and my HDRI.

The Hdri is 512 by 256 pixles.

The Dome light is 256 subdivs, Resolution 512 Adaptiveness 1

DMC is min 2 MAX 16 Noise threshold .001

Apart from making the render even slower. I find it makes very little difference upping the DMC max or reducing the Noise threshold or increasing the Light Subdivs etc.

The only thing I have found that smooths out the dome light is to store it with the radiance map and render the scene using GI.


N

[Dariusz Makowski (Dadal)]

Use Adaptiveness at 0.6 and dome resolution 2048. Also can you maybe provide scene?

set dmc noise to .005
Dont use gi for a moment.

Thanks, bye.

[nomads]

Hi

I cann't send you the scene but here is a a link to my test scene that has similar issues. https://www.yousendit.com/download/b...SWhOQnpvS3NUQw

In my test scene setting the dmc noise to .005 and the light subdivs looks much better but so slow

N

[Dariusz Makowski (Dadal)]

Uh thats max, my bad forgot I'm in max forum whh..

Anyway, the slow issues. How slow is it? Should take aroun 1-5 min for 8 core rig.

[cheerioboy]

I couldn't open your max file but I tried setting up a teapot scene with the HDRI;

DMC: 1/4
Dome light: 20 subdivs
Material: 50 subdivs

I get a smooth result. But when I turn the DMC up to something like 1/8 or 2/16 it starts to bring more noise into the image - I then doubled the light subdivs.

check out your render elements; raw reflection (material subdivs), raw lighting (light subdivs), & Sample rate (DMC) - and play with it

[Svetlozar Draganov]

In you case it it would be much effective if you use the default Vray settings instead of universal-ones.
Here is one example with Adaptive DMC 1/4 , 16 subdivision of the lights and default DMC sampler settings.
Render-time = 19second and the image is much cleaner than the one with universal-settings.

SceneFile>>gi test01.zip

[nomads]

Hi Svetlozar

Thanks for looking into this.

I rendered your scene in 16 seconds! but it has noise in the shadows

How would you suggest I clean it up?

N

[Dariusz Makowski (Dadal)]

Either increase dome sampling
or increase minimum antialiasing
or decrease Adaptive Amount in DMC sampler a bit.
or increase Subdiv Mult a bit.

Either of those methods should do the trick...