Light "spots" problem (Vray)

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Old 11 November 2012   #1
Unhappy Light "spots" problem (Vray)

Hello!
I've been having this problem now with this one scene rendering. It's basically that on the walls and some other things like curtains are appearing those weird light spots (on renders). I am using 3Ds Max 2009 and Vray 1.50.
I can't seem to find a setting which causes this, so I am attaching a test render so you can see how it looks like:

Can anybody help me with this? Thank you!
 
Old 11 November 2012   #2
Double post...

Last edited by musashidan : 11 November 2012 at 05:21 PM.
 
Old 11 November 2012   #3
What lights are in the scene? what GI engines are you using? What are your GI settings? It's less of a guessing game if you supply more data...
 
Old 11 November 2012   #4
Thanks for the reply! I am using Mitchel-Netravalli AAF, and GIs are Irradiance Map and Light Cache.
The light on the scene was Vray sphere light.
However I am using Vray plane light on the scene now (behind the windows), but the problem is similar:



You can see the weird light spots behind the clock on the wall and around the windows' edges.
 
Old 11 November 2012   #5
Is your vray plane light set as a sky portal? What are your vraycam/exposure settings? Are you using LWF?
 
Old 11 November 2012   #6
Originally Posted by musashidan: Is your vray plane light set as a sky portal? What are your vraycam/exposure settings? Are you using LWF?


The light is not set as sky portal (I don't need that there). I don't use Vraycam now, it's rendered from a normal cam, because I liked the outcome better this way. However I tried rendering it with Vraycam and the problem persisted..
 
Old 11 November 2012   #7
If you're placing lights outside the window then it's advisable to enable sky portal as this means they'll take on the luminence of the exterior through GI. If they're behaving as regular vray plane lights then they'll completely blowout that back wall causing the hotspots.
 
Old 11 November 2012   #8
Originally Posted by musashidan: If you're placing lights outside the window then it's advisable to enable sky portal as this means they'll take on the luminence of the exterior through GI. If they're behaving as regular vray plane lights then they'll completely blowout that back wall causing the hotspots.


Thanks for the tip, but I don't think this is the problem, because the spots were pretty clear in the first image, where weren't any lights outside the window, only one sphere light near the ceiling...
 
Old 11 November 2012   #9
have you tried troubleshooting the scene step by step? Turn off(or delete) all the lights and use a default vraymtl as an over ride. turn of GI.

Now start with your main light. Render. Apply material again. Render. Turn on GI. Render.

sometimes this is the quickest way to trouble shoot a scene rather than tweaking with everything on at the same time. The fact that you're not using LWF or exposure would ring alarm bells for me.
 
Old 11 November 2012   #10
what are the settings for the irradiance map? try setting the Hsph subdivs to a higher value than the default 50, try 80 or 100. also try ticking the "check sample visibility" in the advance options inside the irradiance map otions
 
Old 11 November 2012   #11
Is your glass affecting GI? It might be better to have it not.
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Old 11 November 2012   #12
Originally Posted by DaveWortley: Is your glass affecting GI? It might be better to have it not.


What glass..?
 
Old 11 November 2012   #13
Thank you all for your responses, I've just tried everything you wrote but sadly nothing worked for me...
Here is the result:
I set up higher Hsph subdivs and ticked "check sample visibility":

I tried turning off GI (this is not acceptable later...):

I tried using Vray phys cam:

And even changing to linear mapping:


Do you have any other ideas? It looks really terrible :(
 
Old 11 November 2012   #14
This is with default Vray Sun settings:

I don't have a clue what causes this weird light behind the curtains and the clock, and the shadows on the edges of the windows. I have used these render settings many times before and never had this probem..
 
Old 11 November 2012   #15
If you want to upload a stripped down version of the maxscene with only the room/curtains/clock and lighting setup I could take a look at it for you.
 
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