`region`¶

Another layer applied only inside a rectangle or circle, feathered outside it: to confine craters to an area or flatten a landing pad.

Key	Type	Default	Range	Unit	Description
`shape`	region shapes	`{"type": "rectangle", ...}`			Area the inner layer is applied in: a rectangle or a circle.
`feather`	number	`0.0`	[0, inf)	m	Distance in metres outside the shape over which the inner layer fades back to the unchanged height; 0 gives a hard edge.
`blend`	one of `linear`, `smoothstep`, `smootherstep`, `gaussian`	`"smoothstep"`			Curve of the fade across the feather.
`layer`	layers	`{"type": "noise", ...}`			Layer applied only inside the shape. A crater layer here does not count as the crater layer for later boulder ejecta or secondaries.

Every key with its default

{
    "type": "region",
    "shape": {
        "type": "rectangle",
        "min_x": 0.0,
        "min_y": 0.0,
        "max_x": 0.0,
        "max_y": 0.0
    },
    "feather": 0.0,
    "blend": "smoothstep",
    "layer": {
        "type": "noise",
        "stack": [
            {
                "enabled": true,
                "basis": "perlin",
                "fractal": "fbm",
                "blend": "add",
                "seed": 0,
                "wavelength": 1000.0,
                "amplitude": 100.0,
                "octaves": 8,
                "lacunarity": 2.0,
                "gain": 0.5,
                "hurst": null,
                "offset": 1.0,
                "warp_amplitude": 0.0,
                "warp_wavelength": 500.0
            }
        ]
    }
}

Used in: example_layers_regions

region¶

`region`¶