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/<brand.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 detailed mesh model descriptor (.pmd). This is used only for vehicles used by player. Additionally they are used in vehicle previews & browser windows.
model	string		Path to the model descriptor (.pmd). 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	array<string>		Paths to the reduced level-of-detail model descriptors (.pmd), in order of increasing viewing distance (decreasing model complexity).
collision	string		Path to the collision descriptor (.pmc).
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. Default value changed to blank (no sound) in 1.35.
trailer_brace_down_sound	string		For trailer usage only. Path to the sound to be played when extending landing gear. Default value changed to blank (no sound) in 1.35.
variant	token		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		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	0.0	Sets the distance in meters from the fakeshadow surface to begin fading the extended shadow.
extended_shadow_fadeout_length	float	1.0	Sets the length in meters over which to fade out the extended shadow.
extended_shadow_shared_model_variant	token		If provided, specified variant of model will be used to draw the shared shadows.
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	0.0	Fuel tank size in liters.
adblue_tank_size	float	80.0	AdBlue/DEF tank size in liters.
air_tank_pressure	float	10.0	Nominal air brake reservoir pressure in bar. Added in ETS2 1.27/ATS 1.6.
nominal_voltage	float	24.0	Nominal battery voltage. Added in 1.36
residual_travel	array<float>		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	7000.0	For trailer usage only. Sets the unladen mass of the trailer.
powered_axle	array<bool>		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	array<float>	false	For truck usage only. Assigns the static weight on each axle. Each array member corresponds to an axle, from front to back.
liftable_axle	array<bool>	false	For truck and trailers. When true, the axle can be lifted. Each array member corresponds to an axle, from front to back. Trailer functionality is added in ETS2 1.27/ATS 1.6.
steerable_axle	array<token>	see description	For truck and trailers. Each array member corresponds to an axle, from front to back. By default, first axles on trucks are true, while all others are false. Possible values are: false (non-steerable axle) true (steerable wheels on given axle) axle (whole axle is rotated when steering, axle_model must be correctly defined, valid only for trailers). Added in 1.31. Value "axle" was added in 1.50
steerable_lifted_axle	bool	false	For truck and trailers. When true, lifted steerable axles will react to steering. Otherwise they line themselves with chassis once lifted. Added in 1.44.
weight_distribution	enum	semitrailer	For trailer usage only. Determines how forces are transferred between the trailer and its connected vehicle(s). Possible values are: semitrailer (fifth wheel, part of trailer weight transferred) trailer (hook, no weight transfer) spreader (removes the pitch degree of freedom, typical of a spreader/booster/stinger on a lowboy configuration) Added in ATS 1.6.2.
axle_model	array<string>		For trailer usage only. Path to the axle model descriptors (.pmd). Added in 1.50.
axle_model_collision	array<string>		For trailer usage only. Path to the axle model collision descriptors (.pmc). Added in 1.50.
axle_model_extended_shadow_texture	array<string>		For trailer usage only. Texture to be used for the extended (volumetric) shadow underneath each axle. Added in 1.50.
axle_model_steer_angle	unsigned int		For trailer usage only. Overwrites the maximum steering angle of the last steerable axle model. Added in 1.50.
cog_cargo_mass_min	float	0	Lowest cargo mass at which to offset the center of gravity. Added in 1.35.
cog_cargo_mass_max	float	20000	Highest cargo mass at which to offset the center of gravity. Added in 1.35.
cog_cargo_offset_min	float3	(0,0,0)	Distance to offset the center of gravity at cog_cargo_mass_min. Added in 1.35.
cog_cargo_offset_max	float3	(0,1,0)	Distance to offset the center of gravity at cog_cargo_mass_max. Added in 1.35.
sounds	array<string>		Each item assigns an FMOD event to a chassis function, using the "sound_name|sound_path" format. Added in 1.39 Expected sound event names are: air_brake, air_cutoff, reverse, lift_axle, hook_attach, hook_detach, and trailer_cables.
lamp_setup	string		Paths to the special headlight setup if default is not good enough. Added in 1.40 Content of vehicle_lamp_setup unit is an experimental feature and will most probably change in the future!