Question about main.materials.json

After reading Nadeox1's post on texture file formats, I understand that main.materials.json is the new standard while materials.cs is its predecessor. However, there is still something I don't get.

Putting a materials.cs file in the mods folder will add to the native textures.
But, doing the same with a main.materials.json file seems to replace native textures. (which is not what I want)

So, instead of overwriting, can a main.materials.json file in a mirror folder append?

 

Someone correct me if I'm wrong, but I think the format is as follows:

[anything here].materials.json

Doesn't matter what you put inside the brackets as long as it does not conflict with anything else in the same folder.

 

Thanks for this clarification. But this means I'm doing something else wrong.
If I add my texture directly to the native main.materials.json, it works. But putting it in a separate *.materials.json file doesn't. Maybe showing the file will help pinpointing my mistake:

levels/east_coast_usa/art_v2/terrains/test.materials.json

Code:

{
  "Forest2-6e67126e-4790-4cc0-b164-a63ef8188206" : {
    "internalName" : "Forest2",
    "class" : "TerrainMaterial",
    "persistentId" : "6e67126e-4790-4cc0-b164-a63ef8188206",
    "detailDistance" : 1000,
    "detailMap" : "levels/east_coast_usa/art_v2/terrains/green_d",
    "detailSize" : 20,
    "detailStrength" : 0.300000011920929,
    "diffuseMap" : "levels/east_coast_usa/art_v2/terrains/green_d",
    "diffuseSize" : 50,
    "macroDistance" : 50,
    "macroMap" : "levels/east_coast_usa/art_v2/terrains/green_d",
    "macroSize" : 5,
    "macroStrength" : 0.800000011920929,
    "normalMap" : "levels/east_coast_usa/art_v2/terrains/texture_dirt_01_n"
  },
}

 

I tried this with no luck:

Code:

{
  "Forest2" : {
    "internalName" : "Forest2",
...

 

Excellent! Thanks for your time