Changed to LWF, getting blotches

[andyp7]

Hi

Having problems with my scene, I've just started with LWF, not sure if thats the problem, here is a jpeg crop of the blotches I'm getting and here is a list of my settings:

render resolution = 2k

Image sampler = DMC, 1 min 6 max

vray sky in skylight and reflection

Primary GI = Irradiance map, min = -4 max = -1

Hemispherical Sub = 60

Interp samples = 30

clr = 0.3
num = 0.1
dist = 0.1

Secondary GI = Brute force:

subdivs = 12

sec bounces = 3

DMC settings =

adaptive amount = 0.85

min samples = 8

noise thresshold = 0.01

I have tried the follow with no avail:

turn all mats to 50% grey with no reflection etc
change sec GI to Lightcache - blurs the splotches
increased secondary ray bias
deleted everything in scene except for floors and walls
put a reset X-form on all the objects then converted them to editable poly objects
checked for coincident faces
merged all into a new scene
reset vray solution
increased sample rate of brute force GI to 32 subdivs




I'm on a really tight deadline so any help is appreciated.

Thanks in Advance

Andy

[zeronove]

try to drop the noise threshold to 0.005 or similar and see what happens

[andyp7]

That seems to have fixed the problem

Thank you very much zeronove!

Would you say that hemispherical subdivs should be at 60 and interp samples be around 20 for this render?

It's taking quite a while to render now.

[percydaman]

.01 noise threshold will only work well if your using adaptive subdivision as AA method. If your going with adaptive dmc AA, then .005 or even lower might be necessary.

[zeronove]

if the lights settings are quite simple (location, colour and intensity) the default hsph subs values (50-20) should be enough; I can't say it viewing a so small part of your image (maybe a wire could help)

[glorybound]

Would you say that hemispherical subdivs should be at 60 and interp samples be around 20 for this render?

That will bite you in the rear! I would start off at medium 20/20 and go up from there. 60/20 might be overkill for some and not enough for others. I have had image that medium at 20/20 was just fine. If you make blanket statements like 60/20 then you'll think that is some magic setting and get frustrated when your simple scenes take hours to render.

I fell into that trap