I am very new to noise and had a question about 3D noise. I have a 3d cube that is 12 million meters^3. I want to develop a noise function that is capable of having detailed noise at any point in the volume. From the little I understand about noise, I'd have to use a lot of levels to produce enough detail with the size of the volume being that large. Is this correct? And if so, how would I calculate or tell how complex a noise function I'd have to make so that I can generate noise that would be detailed enough at any point in the volume.
Basically I am trying to make a noise function to generate a planet in a large octree volume, and I want to have detailed noise on the surface of this sphere(which will be millions of meters into the volume).Thank you.