Babylon.js/Playground/textures/customProceduralTextures/land/config.json

{
    "animate": false,
    "refreshrate": 1.0,
    "uniforms": [
        {
            "type": "float",
            "name": "dirtAmplifier",
            "value": "6.0"
        }
    ],
    "sampler2Ds": [
        {
            "sample2Dname": "dirtSampler",
            "textureRelativeUrl": "textures/dirt.jpg"
        },
        {
            "sample2Dname": "grassSampler",
            "textureRelativeUrl": "textures/grass.png"
        }
    ]
}