Vehicles

Introduced in SL 1.1, these functions allow creating versatile vehicles with physics that can slide, hover, fly, and float or dive.

Note: Unlike the rest of the official LSL guide, the vehicles section is quite good. See the original LindenVehicleTutorial or the newer Wiki'fied version Vehicle Tutorial.

Some of the behaviors enableable:

• deflection of linear and angular velocity to preferred axis of motion
• asymmetric linear and angular friction
• hovering over terrain/water or at a global height
• Turning on banking Originally this said "Banking on turns" which is not quite right. When enabled, this behaviour does not make an object bank if it turns, it makes the object turn if it banks- TiPBaKeR
• linear and angular motor for push and turning

Functions

llSetVehicleType	define type of vehicle
llSetVehicleFlags	set vehicle flags
llRemoveVehicleFlags	remove vehicle flags
llSetVehicleFloatParam	set vehicle parameters of type float
llSetVehicleVectorParam	set vehicle parameters of type vector
llSetVehicleRotationParam	set vehicle parameters of type rotation

Note: The camera and llSitTarget functions may be useful for vehicles as well.

Constants

(use the matching llSetVehicle<Type>Param function from the table above)

Constant	Value	Type	Description
VEHICLE_ANGULAR_DEFLECTION_EFFICIENCY	32	float	slider between 0 (no deflection) and 1 (maximum strength)
VEHICLE_ANGULAR_DEFLECTION_TIMESCALE	33	float	exponential timescale for the vehicle to achieve full angular deflection
VEHICLE_ANGULAR_FRICTION_TIMESCALE	17	vector	vector of timescales for exponential decay of angular velocity about the three vehicle axes
VEHICLE_ANGULAR_MOTOR_DECAY_TIMESCALE	35	float	exponential timescale for the angular motor's effectiveness to decay toward zero
VEHICLE_ANGULAR_MOTOR_DIRECTION	19	vector	angular velocity that the vehicle will try to achieve
VEHICLE_ANGULAR_MOTOR_TIMESCALE	34	float	exponential timescale for the vehicle to achive its full angular motor velocity
VEHICLE_BANKING_EFFICIENCY	38	float	slider between -1 (leans out of turns), 0 (no banking), and +1 (leans into turns)
VEHICLE_BANKING_MIX	39	float	slider between 0 (static banking) and 1 (dynamic banking)
VEHICLE_BANKING_TIMESCALE	40	float	exponential timescale for the banking behavior to take full effect
VEHICLE_BUOYANCY	27	float	slider between -1 (double-gravity) and 1 (full anti-gravity)
VEHICLE_HOVER_HEIGHT	24	float	height the vehicle will try to hover (*1)
VEHICLE_HOVER_EFFICIENCY	25	float	slider between 0 (bouncy) and 1 (critically damped) hover behavior
VEHICLE_HOVER_TIMESCALE	26	float	period of time for the vehicle to achieve its hover height
VEHICLE_LINEAR_DEFLECTION_EFFICIENCY	28	float	slider between 0 (no deflection) and 1 (maximum strength)
VEHICLE_LINEAR_DEFLECTION_TIMESCALE	29	float	exponential timescale for the vehicle to redirect its velocity to be along its x-axis
VEHICLE_LINEAR_FRICTION_TIMESCALE	16	vector	vector of timescales for exponential decay of linear velocity along the three vehicle axes
VEHICLE_LINEAR_MOTOR_DECAY_TIMESCALE	31	float	exponential timescale for the linear motor's effectiveness to decay toward zero
VEHICLE_LINEAR_MOTOR_DIRECTION	18	vector	linear velocity that the vehicle will try to achieve
VEHICLE_LINEAR_MOTOR_TIMESCALE	30	float	exponential timescale for the vehicle to achive its full linear motor velocity
VEHICLE_LINEAR_MOTOR_OFFSET	20	vector	offset from the center of mass of the vehicle where the linear motor is applied (new in 1.6)
VEHICLE_REFERENCE_FRAME	44	rotation	rotation of vehicle axes relative to local frame
VEHICLE_VERTICAL_ATTRACTION_EFFICIENCY	36	float	slider between 0 (bouncy) and 1 (critically damped) attraction of vehicle z-axis to world z-axis (vertical)
VEHICLE_VERTICAL_ATTRACTION_TIMESCALE	37	float	exponential timescale for the vehicle to align its z-axis to the world z-axis (vertical)

(*1) - The height value is interpreted ground-relative, water-relative or global-position-based according to the hover-related flags (see llSetVehicleFlags). A height larger than 100m seems interpreted as 100. (so when something should be able to go inland, which can easily be 40m up, over 100m in mountain areas, try not to use global height.) Values of 0.0 and below give no response. Very small values like 0.001 do, but objects don't seem to go lower than 2m.

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Functions | Constants