strange splotches

[waaazoo]

Hi there,

I'm having this problem on some scenes (seems quite random) since I use Maya 2015 Ext1 SP5 with Vray 3.0 (official build).
It's a Maya2014 + Vray 2.4 scene loaded into the new configuration.
I'm searching since this morning on the Forum and testing to find where it comes from, but I couldn't find any clear answer.

Has anyone experienced these artefacts ?



UPDATE1: It seems to happen only in DR. So far I cannot find any error message on the DR nodes ( all have last version of Vray3.0, but some are on W7 and some on W8 )

[ivaylo.ivanov]

Is this caused by the GI?

[waaazoo]

Is this caused by the GI?

Yes, IrrMap+ LC. It seems to come from IrrMap. (sorry, forgot to tell)

It could be caused by overbright pixels in one or two materials in the scene, but for sure, it was not a problem with M2014 and Vray2.4.

[waaazoo]

it is maybe caused by the carpaintshader (I have to test more). -> it seems that when I put base reflection of carpaintshader to 0 (previously on 0.3) the splotches are gone (so far).

here is a little test board. As you can see it's quite random.

[svetlozar.draganov]

Would it be possible to send us the scene for investigation?

[waaazoo]

Would it be possible to send us the scene for investigation?

Thanks. I just sent to support a down stripped scene. I can reproduce the problem here, but sometimes it's fine, sometimes not.

[snivlem]

I've found this issue (or similar) when a self-illumination parameter was set too high or a light mtl set too high.

[Bruce Hart]

I've found this issue (or similar) when a self-illumination parameter was set too high or a light mtl set too high.

yep - had the problem same here due to overbright self-illumination

[waaazoo]

Thank you guys. But I nearly never use self-illum; it could be eventually light mtl too high, but what bothers me is that this exact scene was rendering really fine on Maya2014+Vray2.4.

I have a second problem. I'll post it here also as it could be related. I worked on a other scene yesterday which was also created on Maya2014+Vray2.4. It was rendering fine, but I noticed at some rendertests that sometimes a render node can make bad tiles. It was random, not every time, not always the same node...
Over night, hoping it would be ok, but still nervous about this problem I cannot identify, I decided to launch 4 views of the same scene, but twice. Here is the (bad) result:

I used 4 nodes (S1, S3, S4, C1) + workstation
Batch rendering from command prompt window as I always do.

- view A, Render 1: node C1 made some bad tiles (they seem to have bad GI)
- view B, Render 1: ok
- view C, Render 1: ok
- view D, Render 1: C1 + S3 made bad tiles
- view A, Render 2: S3 made bad tiles
- view B, Render 2: S4, S1, C1 made bad tiles
- view C, Render 2: S3 made bad tiles
- view D, Render 2: S1, S4, C1 made bad tiles

As you can see, it's random. It's not always the same nodes which give a problem. The only computer that doesn't make bad tiles is the workstation. And when a node makes problems, it's not all the tiles of this node, it's just some tiles :/ It's not view dependent as I have two renders which are fine.... I could not find any error message in the command prompt windows.
And this scene was rendering fine with Maya2014+Vray2.4 !
But no splotches this time. I'm lost !

[svetlozar.draganov]

Thanks for the clarification.

Is there any chance to send us some output images in order to see where exactly is the issue.
Is it always related to a specific texture, material, geometry etc?

Does it happen or every scene or just on particular ones?
Do all the machines participating in the rendering use the same V-Ray build?
How V-Ray Render Slaves are launched - manually or as a service?
What is the OS of the machines? Do they use the same OS?
Are there any bucket discrepancies if GI is disabled?

[waaazoo]

Thanks for the clarification.

Is there any chance to send us some output images in order to see where exactly is the issue.
Is it always related to a specific texture, material, geometry etc?

Does it happen or every scene or just on particular ones?
Do all the machines participating in the rendering use the same V-Ray build?
How V-Ray Render Slaves are launched - manually or as a service?
What is the OS of the machines? Do they use the same OS?
Are there any bucket discrepancies if GI is disabled?

Dear Svetlozar,
Thanks for looking into this. I sent the rendered views already.
- it is not related to specific texture, material or geometry.
- all machines had the official Vray 3.0 build installed
- Vray slaves are launched manually
- some computers have Windows 7, some have Windows 8.1 (but it doesn't seem related)
- I didn't test without GI

I'm doing right now the same renderings with Maya2015 and Vray 2.4 (official build for Maya2015)

[waaazoo]

I just rendered out the first view (same views as overnight) with Maya2015 + Vray2.4 (official build). Render is fine as it should be, it's just slower than Vray 3.0
I think there is something to investigate....

Am I the only one who has problems with Vray 3.0 ? :/

[svetlozar.draganov]

It would be better to pack the entire scene and send it to us for investigation.
Have you got this issue with another scene or just with this one?

When rendering with 3.x - what is the status of the following options:

*Embree
*Probablistic Lights
*Transfer Missing Assets

If possible run a few test renders without GI with 3.x and let us know if the same issue appears again.

[waaazoo]

It would be better to pack the entire scene and send it to us for investigation.
Have you got this issue with another scene or just with this one?

When rendering with 3.x - what is the status of the following options:

*Embree
*Probablistic Lights
*Transfer Missing Assets

If possible run a few test renders without GI with 3.x and let us know if the same issue appears again.

I will get this information to you as soon as I can install Vray3.0 again. For now I have to speed on projects. I will probably do this next week.
I had these problems on two different scenes for now, couldn't test more than that.

[waaazoo]

Hi,

New tests this morning. To start, I uninstalled all versions of Vray on each node, re-installed Official VRay3.0 build and restarted systems.
On my second test scene I used previously I had these settings (to respond to previous questions):
- Embree: unchecked
- Probalistic lights: unchecked
- Transfer missing assets: unchecked

********** This is mostly about problem N°2: some nodes make randomly bad tiles **********

workstation + 5 rendernodes (S1, S3, S4 are on windows 7 | C1, C2 on windows 8.1)
All tests made on same scene, same view, same render size (1350x891)

- test1: with previous scene (embreeff, PL: off, TMA: off, GI on, Irrmap + LC) -> S4 made some bad tiles
- test2: (TMA: on) -> C1 made some bad tiles
- test3: (TMAn, PLn) -> S3 made some bad tiles
- test4: (hide fur + fur object / I had messages that fur material produces overbright or invalid color) (TMAn, PLn) -> S3, C2 made some bad tiles
- test5: (hide fur, PLff) -> S1, C1 made bad tiles
- test6: (unchecked GI) -> seems ok, but difficult to see as some areas are pretty dark
- test7: (GIn but primary and secondary brute force) -> no bad tiles !

Curiously, the bad tiles seem to happen principally in second half of picture, except for test1 (but random)

I could make more tests as I have nothing special to render out right now, just tell me what to do
I will pack scene and send to support ([#415024])