AA noise

[rjw]

Hi,

I'm new to Vray and having some AA problems with this WIP image http://www.richardwoolsgrove.com/cad...d=17&pageNum=1
What would you recommend to smooth this out?
AA settings
Adaptive QMC min 1 max 4
AA filter, Catmull-Rom

QMC sampler adaptive amount 0.85 Samples 8
noise 0.005 subdiv 1.0

I'm using IES lights, with vray properties as default (diffuse subdiv 150, multiplier 1)
Vray shadows Area, sphere UVW all 0.1
I'm working in meters.

Many thanks,
Richard

[joconnell]

Heya Richard,

A lot of people here use 0.002 for the noise level and 0.91 for their adaptive amount - gradually raise the global subvis multiplier until the noise goes away. Catmull rom can cause some problems too since it's such a sharp filter, you could also try mitchell netravelli or even area and do an unsharp mask filter in photoshop.

[rjw]

joconnell,

cheers for the info, I'll try that out.
Richard

[DaForce]

...what are you rendering with IR LC QMC??

Or just QMC?

[rjw]

Primary IR
Secondary LC

[DaForce]

Its weird.. its like there is no direct light in that room at all.
Try adding a vray light on the ceiling and see if that makes the problem go away.

[rjw]

DaForce,
The IES lights are pretty dim with is setup, bumped them up to 400%. they are from Erco, looks like there is 2 bulbs in the fitting. I'll try your suggestion and swap them for omnis. I was hoping to use IES to do a basic lighting study.

Have you used IES with success.

[DaForce]

IES should be fine, I just meant to put the vray light in on the roof to add some more light and see if the problem went away (just for testing purposes, not really meant to final use)

Yes IES usually work fine. But just be careful that if you are using the light model from erco as well that is has raytrace materials on it and you should replace those with vray materials

[rjw]

I just loaded up the IES data, no geometry.
I'm running a bunch of tests now (with joconnell's settings) I'll stick a vray light in too. Will take time as I'll do them all at full res.

Will post results.

Thanks

[DaForce]

Well if your just testing... use render region and just render an area of the worst noise. That was you can tell quickly if your changes have made any difference.

(not much point doing a whole render if its not going to make any difference)

[rjw]

of course.
tempting to lie and say I already did this, but I didn't idiot
reset them now.

[rjw]

ok, here are the results
http://www.richardwoolsgrove.com/cad...d=17&pageNum=1
the AA filter mitchell netravelli is best in this. The images still look noisy. I added a vray light to the third image, look cheerier so I've bumped up my IES light, they now don't represent reality at all!

[glyph]

aa: qmc max value 5 might help

looks like the taps and basins need more steps in the 3d mesh!

[DaForce]

I certainly think the last one looks the cleanest ... and probabaly best light (in terms of overall light levels)

Actually i think a halfway point between the 2 images would be best.

[rjw]

glyph,
I'll give that value a try.
With the meshing I'm using DWG link on it's finest setting, I work in meters, 0.001 is the lowest setting.
I'm not sure other than rescaling my model how to up this.

DaForce, I thing you have a good point about the light value. I'm going to push the IES %age up.

I'll post my results tomorrow.
Thanks for you help.
R