Problem with 3d objects

[anastasia_7008]

 Hello! I started learning making 3d objects in illustrator and i faced a problem. When i transform the object into 3d (any type of 3d) it becomes grained. How to avoid this? I attached a screenshot to show how it looks

[Monika Gause]

Which settings did you select in the Raytracing options? There you can reduce noise.

But also: How large is that object?