Your question is confusing, mainly because you suggest zooming out would help, but I don't understand how that changes the surface mapping at all.
When you say "moon", do you just mean basically a 2nd planet, or do you mean literally *the* moon (our moon), using a moon texture image? I will assume the first one.
So, you just add multiple surface layers, just as you would with the primary planet. When doing it on a secondary planet, the process is as follows:
Create your 2nd planet on the Objects layout with Add Object -> Object -> Planet
Assuming you're using Terragen 3, now you see it in your object list, and there's a + next to "Planet 02"; click that to expand and see the internal nodes
Now you see "Power Fractal Shader v3 01" or something inside the planet, click that and the node network on the right should center on it (inside the internal network of theplanet object)
Now, in the node network view on the right, right-click the Power Fractal Shader and in the pop-up menu, go to Surface Shader and choose Surface Layer; this should create a surface layer node *underneath* the Power Fractal (after it in the node network calculation, i.e. on top of it)
Just keep adding surface layers in the same way, basically, and color them how you want, adjust coverage, etc. You can of course add any other shaders you want in the same way.
- Oshyan
