Material Limit? Maya 2.04

[JimStar]

Would I have to recreate the materials?

No you don't.

It seems that there may be some really weird reasons of that somewhere inside your scene, that are really hard to guess not having the scene to be able to reproduce it... As the max shaders amount restriction is definitely improved in this last release. It still exist, but it is improved a lot.

How many mesh objects do you have inside this scene? I mean how many separate meshes?

[jnuno_]

769 different meshes.

[JimStar]

769 different meshes.

This is not too much.

And how many of all Octane nodes (including textures, transforms, mediums etc...)?

Does it start to render OK after you hide any few meshes, or just some specific ones?

[jnuno_]

This is not too much.

And how many of all Octane nodes (including textures, transforms, mediums etc...)?

There are 36 Octane material nodes in this scene and every one has 4 image texture nodes. So that's 144 texture nodes in total.

Does it start to render OK after you hide any few meshes, or just some specific ones?

It starts to render when I hide/delete any meshes.

[JimStar]

So that's 144 texture nodes in total.

Gotcha!
It's not a plugin issue.
It's a well known CUDA RGB textures amount restriction. You can't load more into GPU.

[JimStar]

You can try to use greyscale or alpha image textures where appropriate, to not spend the RGB textures resource.

[jnuno_]

So that's 144 texture nodes in total.

Gotcha!
It's not a plugin issue.
It's a well known CUDA RGB textures amount restriction. You can't load more into GPU.

Ok cool I'm actually really happy we found what can be the problem. How would I work on the scene from this point on? Do I need to slave the rest of the machines in order to do a render, or how would this work?

[JimStar]

Ok cool I'm actually really happy we found what can be the problem. How would I work on the scene from this point on? Do I need to slave the rest of the machines in order to do a render, or how would this work?

The general rule - you can not exceed the CUDA limit for the total amount of textures referenced from all Octane nodes of the scene curently loaded into the GPU. Even if you have several GPUs on the machine the limit remains the same.
All these CUDA limits (for all types of textures) are stated e.g. in Octane FAQ here: http://render.otoy.com/faqs.php (in the very first question "What are the hardware requirements for Octane Render?").
So, just be sure that even if you have 65000 shader nodes in total - it will render OK if total amount of different texture files referenced from all image texture nodes of this scene does not exceed the CUDA limits.