Render VRay RT with CUDA crash VRay

[Jiri.Matys]

Hi,

I try to render pretty heavy scene (lot of Forest Pack) with VRay RT and CUDA. All was good, initialize of geometry, load bitmaps and than vray rt crash. I can close it and continue work, but dont know why it crash. It saves vray dump, so I sending it, if someone can look at it. Maybe I dont have enough GPU memory, dont know.

Thanks a lot.

VRay dump.zip

Update: Now I find out it crash only when I use XRefs and Containers option (there are three houses in xrefs). If I dont check this feature, it render good with all forest pack objects. But why it crash with xrefs?


I have win 7 x64, max 2015, VRay 3, GeForce GTX 780 3GB SC.

[Svetlozar Draganov]

This bug is most likely related to insufficient Vram.
Can you show us the log file from V-Ray RT console? It prints useful information about the Vram usage:


You can also monitor your GPU usage via the following tool:
http://www.myfavoritegadgets.info/in...tml#GPUMonitor

Is Resize Texture for GPU option activated?
ForestPack objects are V-Ray proxies or regular geometry?
Does the scene crash if the master scene is empty and all the geometry comes from the XRefs?

[Jiri.Matys]

I will look at a console and let you know.

I monitor a Vram, I have 3GB and I think it didnt go up then 2800 or so. But not sure.
Resize texture was on.
Forest objects are regular objects. But when hide xrefs, it works pretty well.
I didnt test if scene crash when only xrefs are in. I will test it and let you know.

Thanks.

[Jiri.Matys]

Sending a picture of a console and generated dmp file again.
Now I try only objects from xrefs, delete all but camera and light. Its the same, VRay RT crash, as you can see.

VRay.zip

[Svetlozar Draganov]

Thank you very much for the dump file - we will send it to our developers for investigation.
Meanwhile would it be possible to merge the Xref files in the master scene and run another test render.
Please include the entire information from the vray-console if possible.

[Jiri.Matys]

Hello,

I test it after merge and it crash.

I made three pictures of a console before it crash and I have to close it.



Thank you.

[Svetlozar Draganov]

I can see that a lot of textures are being used in the scene - let's try to remove them temporary by assigning default VrayMtl into Override Mtl slot in Global Switches Rollout.
Please use the merged version of the scene.
Can you show is how the scene looks like?

[Jiri.Matys]

I try it and it crash anyway. But it looks it still load all textures at the end although I use material override.

Here is a screen:



Best regards.

[tashko.zashev]

Hi,

Bitmaps could be still loaded if you use them for lights or in the environment slots. Could you try to remove them and run another test render with RT / GPU?
Generally a big part of the graphic card memory could be taken by the V-Ray environment maps. So try to remove them first.

Please let me know if you still receive this error after making the above changes.

[Jiri.Matys]

Sorry for delay, I was ill.

I have really interesting result:

Again I try render it with RT normally - crash. Then I try to use material override - crash. Then try to hide HDRI map which is assigned to Environment in max - worked. But here it is - this map is also used in VRay Dome Light and I leave it, so HDRI was still loaded and shown on render (all objects was overrided). So why it crashed with Environment map assigned, really dont know.

[vlado]

V-Ray RT GPU always loads environment maps at their full resolution. However if the map is really large, the GPU may fail to load it.

For the dome light, we rescale the map to the resolution specified in the dome light settings.

We definitely need to add some checks for the map resolutions though, crashing is certainly not good.

Best regards,
Vlado

[Jiri.Matys]

Oh, ok, this is it. HDRI is large I think, so some checking and downsampling would be good. Thanks for explanation.

[Jiri.Matys]

I have bad news.

Its working only when I merge all xrefs and delete environment map. But if I dont merge xrefs, it crash

[Svetlozar Draganov]

Have the Xrefs got environment map applied?

[Jiri.Matys]

Good point, I think not, but have to check it out.