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# Factorio Prototype Docs Version 2.0.77

# FogMaskShapeDefinition - Prototype Docs

## FogMaskShapeDefinition :: struct

## Properties

- default
- sorted

rect | :: SimpleBoundingBox |
falloff optional | :: float |

rect | :: SimpleBoundingBox |
falloff optional | :: float |

## Properties

### rect :: SimpleBoundingBox

### falloff :: float optional

Default: `1`

Type used in

- RailsFogMaskDefinitions::north
- RailsFogMaskDefinitions::east
- RailsFogMaskDefinitions::south
- RailsFogMaskDefinitions::west
- RocketSiloRocketPrototype::rocket_fog_mask
- WorkingVisualisation::north_fog_mask
- WorkingVisualisation::east_fog_mask
- WorkingVisualisation::south_fog_mask
- WorkingVisualisation::west_fog_mask
- WorkingVisualisation::fog_mask