Unable to render 11 mill poly scene

[OlaHaldor]

I have a scene I've built, it's using CC subdivs. With CC off, it renders fine, but of course, it doesn't look so nice.
When CC is on, Octane takes a long time to load, up to 99.5% and then in the end it simply won't cope with it and tells me to check the log.

The log doesn't make me much smarter either, but it looks like it runs out of RAM. I have a GTX 1080 with 8GB RAM.
Monitoring the GPU with GPU-Z, I can't see the GPU RAM usage increase at all - but system RAM does.

I have set up the out of core RAM to 8GB at first. Same error. Then tried 32GB. No change. Then I went to a whopping 96GB. Still won't render the scene!
Quite frustrating to say the least.

Help!

[face_off]

What is System->Preferences->Octane->Maximum Vertices set to? It should be set slightly higher than the number of triangles in the scene (which will be double the number of polygons) - so 22 million. Try 30 millions to be on the safe side. 30 million tris will not take up much VRAM (maybe 2 or 3 GB?). Regarding the log - perhaps you are looking at the Octane Log - try the Modo Event Log instead.

Paul

[OlaHaldor]

I tried upping that too, but probably too little then.
I won't be home until late tomorrow night - I'll check it again then.

[OlaHaldor]

Looks like I already had changed the default value to this in a desperate try.

Edit:
I hid some layers. The issue might be because of a specific object. I'll investigate that later.

However, What I see now is some really odd placement..
See the mountain in the OpenGL view. It's swallowing the buildings in Octane render. None of the objects have any transforms. They are all CC subdiv level 2.

[face_off]

Looks like I already had changed the default value to this in a desperate try.

150 million is probably too high - since that will require a huge chunk of RAM. I suggest 50 million (if you have plenty of RAM), and only increase if the plugin pops the msg saying there are too many polys. 11 million polys will be 22 million triangles, requiring 22 million vertices, so setting the value to 25,000,000 should work too.

I hid some layers. The issue might be because of a specific object. I'll investigate that later.

However, What I see now is some really odd placement..
See the mountain in the OpenGL view. It's swallowing the buildings in Octane render. None of the objects have any transforms. They are all CC subdiv level 2.

I notice you have Use Modo Render Cache ON. There have been many bug reported to TheFoundry on the render cache, so in general I only use it as a last resort (if you need micro-poly displacement for example). Turn it off and see of the problem is resolved.

Paul

[OlaHaldor]

Ah, that did the trick.

Thanks man!