Large scenes

[Q-Games]

Hi everybody, I recently purchased (well, my company did) a copy of Octane Render, and so far it's fantastic.
Today I was doing some experiment for a scene I have to create, which will be some sort of Island in the middle of the ocean. Now, the manual says clearly that it's very important for Octane to set the scale of the scene accordingly to the reality, so I set my Maya units to 1 unit = 1 meters, and my island measures about 400 meters.
But when I render the scene in Octane, I get this:

As you can see, the shading is completely dirty, and full of crazy lines all over the surface.
I did some test, and if I scale down the object, to say, 10 meters, it renders out fine.
Am I missing something? I thought Octane could manage big scenes, so what am I doing wrong?

[hmk]

Select the surface in octane and make sure smooth is turned on in the material tab for that surface. Also make sure you followed the exporting guidelines from Maya.

[Q-Games]

I don't want the shading to be smooth, I made it with sharp edges on purpose, but I just want the weird glitch to disappear, and because the problem is not present on a smaller scale, it makes me think of a bug...

[hmk]

Did you try to increase the polygon count on the larger scale model?

[matej]

What LOD you'll be needing here? If you'll need to render stuff as small as a person, or smaller, then you'll (probably?) need to keep the scale. But if you are rendering the island itself, you can scale it down and not strictly conform to the "real scale" measurements. I don't always strictly conform to that rule.

[roeland]

For large scenes like that you will need to increase the rayepsilon parameter in the kernel settings.

--
Roeland

[Q-Games]

For large scenes like that you will need to increase the rayepsilon parameter in the kernel settings.

Thank you Roeland, that worked like a charm!