IM problem in distributed rendering

[alexnode]

Hi all,
I have dark splodges in IM + LC and distributed rendering. My maps are ok.
Any hint on what it could be ? VRay 3.10 +max 2014. Old project ...

[alexnode]

I have the same problem with light cache and brute force -
The render works only with irradiance +Brute force

[alexnode]

I don't know if that is of any help but If i restart max it renders ok for a while and then it starts doing the black spots again.

[tsvetan.geshev]

Do you have this problem only with one scene or it is for every new scene?
Can you post some examples?

[alexnode]

I believe that the scene i am working is particularly vulnerable to this bug. But it has happened before.
I rendered at 2800+ pixels 7 renders last night without the problem( after a clean restart of 3ds max ) . It happens when i render small bits quickly at low resolutions and then it doesn't recover . I turned all lights off and isolated objects and it still happens. When it crashes for the first time it doesn't recover
I am working on my laptop today but tomorrow i will be able to save an example.

[alexnode]

It happened again ... Any clue?

[alexnode]

https://www.dropbox.com/s/31k26qv4us...11.35.jpg?dl=0
here is a dropbox link

[vlado]

Are you using Bitmap textures or VRayHDRI? There is a known issue in 3ds Max 2014 when the automatic gamma was introduced, where Bitmap textures would randomly ignore the gamma on the render nodes. I think this might be fixed in the newest 3ds Max version. Otherwise, converting to VRayHDRI seems to help.

Best regards,
Vlado

[alexnode]

I tested all the workstations turned off each one and there was no difference.
I use 4 machines.

[vlado]

I tested all the workstations turned off each one and there was no difference. I use 4 machines.

It renders fine without DR though?

Best regards,
Vlado

[alexnode]

Yes no DR and it renders fine ...

[vlado]

Ok, so can you try to convert the Bitmaps to VRayHDRI (right-click in a viewport and choose Bitmap to VRayHDRI converter) and see if it helps? Make sure to save a copy of the scene before that though.

Best regards,
Vlado

[alexnode]

Ok, so can you try to convert the Bitmaps to VRayHDRI (right-click in a viewport and choose Bitmap to VRayHDRI converter) and see if it helps? Make sure to save a copy of the scene before that though.

Best regards,
Vlado

Ok I will try that. I managed to find a workaround by clicking restart server at render end. I will try to change to vray hdri ...

[alexnode]

Ok so far so good !
I clicked restart server at render end and changed bitmaps to vray hdri - and it works so far. I will work on the file for a few more hours and will mark it as solved if it is OK.
Thank you for your help.

[alexnode]

Ok I finished this project now. It happened a few more times but with the restart server at render end and the hdri materials i managed to be able to render almost all the time without dark patches.