Add noise outside of a landmass using a mask?

Hey! any advice how I can add some noise outside of a landmass/continent on the flat area?

I do have a mask for the landmass, so I’ve identified it… just not sure how to get the rest of the way. where there’s low low areas and water, maybe add this mask in, and get some rock noise or texturing to make it like, more realistic water instead of paper flat

Feel like masks are a tough area so im taking notes and practicing.

Masks in their simplest form you either add to or subtract from so for example.

Add a ground texture node and use the mask you have to isolate it only to that area.

Some surface nodes need a surface to begin with and some don’t have a mask slot when you drag and drop a mask onto it’s node. In that case you can use combine or transpose after then mask that instead.

For example say you have your Terrain, your mask and your rough ground piece you want to add and you’re choosing the combine route.

You combined terrain+ rough (additive in this case) then apply your mask by dragging and dropping its wire over the combine node, you’ll get a context menu to add it to any IN port the combine has.

Now what you’ve done is ADD the values of your ground to your main terrain and set constraints so it only applies on the white part of your mask

You could also opt using the /mask node instead as this has some processing advantages what you’re changing masks.

Usually I do prefer it if I don’t need a special combine mode.

You are right though the power of procedual software is all with the masks, I recommend studying any source you can get a hold of on studying masks as the skill is quite transferable.

Great learning resources on combine modes ( and thus masking)