Why i become this artifacts?
Sorry for my bad english
Thanks
is that an extruded spline that you have self illuminated ?
rather than attaching the material to the whole object … just attach it to just the face … then you will not get that bleeding (hopefully) 
welcome to the forum by the way
I think it has to do with low irradiance settings combined with high light multipliers (if these are vray lights ?)
Gijs
it could also be your lights intersecting the ceiling
Some settings?
We could say more about your problem…
But I think you have very low irradmap rates…
you can also try “check sample visibility” in the advanced imap settings
Thank you for your quick answer.
The illumination is a exterior direct light mult. 2,5 and a exterior Vraylight in the south windows mult. 1. The mesh is totally fact in AutoCad
Excuse for my poor english.
usually i just use the same settings in almost all my stuff as defaut then tweek from here
min/max = -3/0
clr thresh 0.3
nrm thresh 0.3
disk thresh 0.3
Hsph. Subdiv 60
interp samples 60
i try never to go over 1 in my bounce multipliers and
try not to use 1 for your secondary bounce. 0.75 is usually nice.
Plus i usually use adaptive AA
To reduce the artifacts arround holes, try to set GI environment multiplies above 1 and up the Dark multiplier in the color mapping menu.
The floor reflection is a glossy probrem. try to up the mat. refl. subdivision
Are you using Vray Mats?
Bye from Córdoba
Thank’s Josele, yes all materials in the scene are Vray Mats,
I will apply your suggestions now and shortly post the result.
i was just wondering because i have seen the same on my own render …
are they self illuminated boxes in the holes ?
Hi natty
They are not holes, they are self illuminated (material) boxes hit to the ceiling.
In the new render it seems that the problem of the boxes has been corrected thanks to your suggestions but it takes in the first prepass 2 hours and he still has left
Excuse for my poor english.
only uncheked visibility in vray lights…
it is the Illuminaited bits that is doing it … ive seen it many times before … im sure.
Now it has finished the first prepass after 2 hours, and they still lack 3, I believe that the values min/max = -3/0 for a 3200 pixels image are too high,
but I will wait even this way.. my god gives me patience :roll:
I am thinking aloud :idea: should the irradiancemap of this image (360 degree solution) be theoretically valid for the same camera
without changing focal opening neither location, although changes the position, not?
-3/0 is for 640*480 to 800*600! If you double the resolution, you can lower the min/max both by 1. So -5/-2 on 3600width will give you same result as -3/0 on 800*600 and I think that should be enough.
You artifacts are 100% sure from that self illuminated mat. I would just give it the same mat, but apply a vraymtlwrapper and uncheck send and recieve GI. It seems that you don’t mind that these boxes don’t illuminate the room, so they’e just there for the look, and then they shouldn’t add up to your GI calculation.
and if they are adding to the lighting you can just put a vray light in that area to create the light
-After 49 hours this is the result (original size 3200 x 1600 pixels), better without discussion, but… productive? :?
-Rended in a Dell Precission Dual Xeon HT 2.66, 2 Gbytes ECC RAM, WXP pro
-The reflection areas are as I waited for them
Floor mat: Reflect: Glosiness 0,75 Subdiv: 100
-Result & settings
Subdiv: 100 for the floor glossy? :? :?
Yes maxxer. If I put it lower than 100 too much artifacts appears