Driver Input and Physics Loop

Sends normalized throttle, steering, service-brake and handbrake values to the built native controller.

Set input before jolt_update() in the normal Step event. There is no separate vehicle update method because the VehicleConstraint participates in the native physics step automatically.

Methods#

// Step event
var throttle = gamepad_axis_value(0, gp_axislv);
var steering = gamepad_axis_value(0, gp_axisrh);
var brake = max(0, gamepad_axis_value(0, gp_axisrv));
var handbrake = gamepad_button_check(0, gp_face1);

if (!car.set_inputs(throttle, steering, brake, handbrake)) {
    show_debug_message(jolt_get_error_message());
}
jolt_update();

Automatic reverse#

In automatic transmission mode, negative throttle is interpreted by the native controller as reverse input. In manual mode, select a negative gear explicitly with set_gear().

Failure conditions#

• The vehicle has not been built.
• The vehicle, chassis or managed world has been destroyed.
• A low-level caller supplies NaN, infinity or an out-of-range value.

Verified operation contracts#

These contracts distinguish units, return values, errors and lifetime according to the current implementation. Check results: false, 0 and undefined can mean different things for different methods.