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# Factorio Prototype Docs Version 2.0.77

# SpiderEngineSpecification - Prototype Docs

## SpiderEngineSpecification :: struct

Used by SpiderVehiclePrototype.

## Properties

- default
- sorted

legs | :: SpiderLegSpecification or array[SpiderLegSpecification] |
walking_group_overlap optional | :: float | The amount of overlap allowed between spider leg walking groups. [...]
The amount of overlap allowed between spider leg walking groups. [...]

legs | :: SpiderLegSpecification or array[SpiderLegSpecification] |
walking_group_overlap optional | :: float | The amount of overlap allowed between spider leg walking groups. [...]
The amount of overlap allowed between spider leg walking groups. [...]

## Properties

### legs :: SpiderLegSpecification or array[SpiderLegSpecification]

### walking_group_overlap :: float optional

Default: `0`

The amount of overlap allowed between spider leg walking groups. Valid values are between 0.0 and 1.0. Default is 0.0 (no overlap); all legs in the current walking group must complete their step before the next walking group is allowed to move. 0.5 means the next walking group is allowed to start when the time remaining in the current walking group's step is about half of the time that the next group's step is predicted to take.

Type used in

- SpiderUnitPrototype::spider_engine
- SpiderVehiclePrototype::spider_engine