Documentation/Engine/Units/accessory chassis data

The accessory_chassis_data unit class is used to define the chassis characteristics for the player's vehicle including axle weights, extended shadow parameters, and fluid capacities. It is also used to define chassis characteristics of trailers and AI vehicles. Units of this type are usually defined in /def/vehicle/truck/<make.model>/chassis/*.sii, /def/vehicle/trailer/<trailer_name>/*.sii, and /def/vehicle/ai/<vehicle_name>/chassis.sii.

Attributes

Many common attributes are inherited from accessory_data.

Name	Type	Default Value	Description
detail_model	string		Path to the high level-of-detail mesh. This is generally unused, but can be used for fine detail or ‘expensive’ shader effects that are only visible very close to the vehicle.
model	string		Path to the standard level-of-detail mesh. If only a single LOD is used, it should be set up as model, and the other attributes (detail_model, lods) should not be defined.
lods	string array		Paths to the reduced level-of-detail meshes, in order of increasing viewing distance (decreasing model complexity).
collision	string		Path to the appropriate collision (.pmc) model.
trailer_brace_model	string		For trailer usage only. Path to the animated landing gear model.
trailer_brace_anim	string		For trailer usage only. Path to the landing gear animation.
trailer_brace_up_sound	string		For trailer usage only. Path to the sound to be played when retracting landing gear.
trailer_brace_down_sound	string		For trailer usage only. Path to the sound to be played when extending landing gear.
variant	token	default	Variant to be used from detail_model, model, and lods.
variant_uk	token		Variant to be used in countries which drive on the left. If unspecified, defaults to the value of variant.
look	token	default	Look to be used from detail_model, model, and lods.
shadow_texture	string		Texture to be used for basic shadow.
shadow_intensity	float	1.0	Relative intensity of basic shadow.
extended_shadow_texture	string		Texture to be used for the extended (volumetric) shadow.
extended_shadow_intensity	float	1.0	Relative intensity of the extended (volumetric) shadow.
extended_shadow_fadeout_start	float		Sets the distance in meters from the fakeshadow surface to begin fading the extended shadow.
extended_shadow_fadeout_length	float		Sets the length in meters over which to fade out the extended shadow.
extended_shadow_shared_model_variant	token
ui_shadow	string		Path to the model descriptor (.pmd) for the UI shadow (used for the truck/trailer browser, thumbnail generation, etc).
tank_size	float		Fuel tank size in liters.
adblue_tank_size	float	50	AdBlue/DEF tank size in liters.
residual_travel	float_array		For trucks and trailers. The limit of upwards and downwards travel in meters for each axle. Each array member corresponds to an axle, from front to back.
trailer_mass	float		For trailer usage only. Sets the unladen mass of the trailer.
powered_axle	bool_array		For truck usage only. When true, motive torque will be applied on the axle. Each array member corresponds to an axle, from front to back.
kerb_weight	float_array		For truck usage only. Assigns the static weight on each axle. Each array member corresponds to an axle, from front to back.
liftable_axle	bool_array	false	For truck usage only. When true, the axle can be lifted. Each array member corresponds to an axle, from front to back.
powered_wheel	bool_array		Deprecated – use powered_axle instead.

Raw Unit Definition

  "accessory_chassis_data":{
   "superclass":"accessory_data",
   "attrs":{
    "name":{
     "type": "string"
    },
    "short_name":{
     "type": "string"
    },
    "icon":{
     "type": "string"
    },
    "info":{
     "type": "string_array"
    },
    "price":{
     "type": "s64"
    },
    "unlock":{
     "type": "uint"
    },
    "suitable_for":{
     "type": "string_array"
    },
    "conflict_with":{
     "type": "string_array"
    },
    "defaults":{
     "type": "string_array"
    },
    "require":{
     "type": "token_array"
    },
    "detail_model":{
     "type": "string"
    },
    "model":{
     "type": "string"
    },
    "lods":{
     "type": "string_array"
    },
    "collision":{
     "type": "string"
    },
    "trailer_brace_model":{
     "type": "string"
    },
    "trailer_brace_anim":{
     "type": "string"
    },
    "trailer_brace_up_sound":{
     "type": "string"
    },
    "trailer_brace_down_sound":{
     "type": "string"
    },
    "variant":{
     "type": "token"
    },
    "variant_uk":{
     "type": "token"
    },
    "look":{
     "type": "token"
    },
    "shadow_texture":{
     "type": "string"
    },
    "shadow_intensity":{
     "type": "float"
    },
    "extended_shadow_texture":{
     "type": "string"
    },
    "extended_shadow_intensity":{
     "type": "float"
    },
    "extended_shadow_fadeout_start":{
     "type": "float"
    },
    "extended_shadow_fadeout_length":{
     "type": "float"
    },
    "extended_shadow_shared_model_variant":{
     "type": "token"
    },
    "ui_shadow":{
     "type": "string"
    },
    "tank_size":{
     "type": "float"
    },
    "adblue_tank_size":{
     "type": "float"
    },
    "residual_travel":{
     "type": "float_array"
    },
    "trailer_mass":{
     "type": "float"
    },
    "powered_axle":{
     "type": "bool_array"
    },
    "kerb_weight":{
     "type": "float_array"
    },
    "liftable_axle":{
     "type": "bool_array"
    },
    "powered_wheel":{
     "type": "bool_array"
    }
   }
  },