docs/museums/biome_generator/rails.gd

@@ -7,7 +7,7 @@ extends Path3D
 @export var axes_distance: float = 3.0 
 @export var rail_distance: float = 1.2 
 @export var cameras: Node3D 
-@export_range(0.0, 1.0) var basic_swing: float = 0.5 
+@export_range(0.0, 1.0) var basic_swing: float = 0.1 
 
 @export_group("Rails Bulding")
 @export var sleepers_distance: float = 1.0
@@ -37,6 +37,8 @@ var fireworks_colors: Array[Color] = [
 var train_instance: Node3D
 var train_progress: float = 0.0
 var swing_time: float = 0.0
+var curve_roll: float = 0.0
+var curve_pitch: float = 0.0
 
 var stop_offset: Array[float] = []
 var stops_position: Array[Vector3] = [] 
@@ -211,6 +213,8 @@ func train_move(delta: float) -> void:
 				if stop_offset.size() > 0: next_stop_index = stop_offset.size() - 1
 		
 		var center_position = to_global(curve.sample_baked(train_progress, true))
+		var prog_back = wrapf(train_progress - 2.0, 0.0, total_length)
+		var back_position = to_global(curve.sample_baked(prog_back, true))
 		var prog_forward = wrapf(train_progress + 2.0, 0.0, total_length)
 		var forward_position = to_global(curve.sample_baked(prog_forward, true))
 
@@ -223,13 +227,28 @@ func train_move(delta: float) -> void:
 			cameras.global_position = center_position
 			cameras.global_basis = train_instance.global_basis
 				
-		if not stop_ongoing:
 		var real_speed = abs(train_speed * stop_multiply)
-			swing_time += delta * real_speed * 2.0
+		var speed_factor = clamp(real_speed / max(speed_max, 0.001), 0.0, 1.0)
+		var dir_prev = (center_position - back_position).normalized()
+		var dir_next = (forward_position - center_position).normalized()
+		var signed_curve = dir_prev.cross(dir_next).y
+		var curve_amount = clamp(abs(signed_curve) * 8.0, 0.0, 1.0)
+
+		curve_roll = lerp(curve_roll, (-signed_curve * 0.08) * speed_factor, delta * 4.0)
+		curve_pitch = lerp(curve_pitch, curve_amount * 0.012 * speed_factor, delta * 4.0)
+
+		if not stop_ongoing:
+			swing_time += delta * real_speed * (2.0 + curve_amount)
 			var amplitude_z = 0.006 * basic_swing
 			var amplitude_x = 0.004 * basic_swing
+			var curve_sway = sin(swing_time * 1.35) * 0.01 * curve_amount * speed_factor
 			train_instance.rotation.z += sin(swing_time) * amplitude_z
 			train_instance.rotation.x += cos(swing_time * 0.8) * amplitude_x
+			train_instance.rotation.z += curve_roll + curve_sway
+			train_instance.rotation.x += curve_pitch
+		else:
+			train_instance.rotation.z += curve_roll
+			train_instance.rotation.x += curve_pitch
 
 func _execute_stop(go_forward: bool = true) -> void:
 	stop_ongoing = true