init

entities/RoadPath.tscn

@@ -0,0 +1,14 @@
+[gd_scene load_steps=3 format=3 uid="uid://cjk3phtyyiyty"]
+
+[ext_resource type="Script" uid="uid://bdw7xdf1lc3ud" path="res://entities/do_spline.gd" id="1_c4y0q"]
+
+[sub_resource type="Curve3D" id="Curve3D_p7e7j"]
+_data = {
+"points": PackedVector3Array(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6.24595, 0, 10),
+"tilts": PackedFloat32Array(0, 0)
+}
+point_count = 2
+
+[node name="Track" type="Path3D"]
+curve = SubResource("Curve3D_p7e7j")
+script = ExtResource("1_c4y0q")

entities/do_spline.gd

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+@tool
+extends Path3D
+class_name RoadPath
+@export_tool_button("update_control_points") var action = update_control_points
+
+func update_control_points():
+	if curve.point_count < 2:
+		return
+	
+	
+	# Start point: out control based on next point
+	var dir = (curve.get_point_position(1) - curve.get_point_position(0)).normalized()
+	var tangent_length = dir.length() / 3 
+	
+	curve.set_point_out(0, dir * tangent_length)
+	
+	# Intermediate points: in and out controls based on adjacent points
+	for i in range(1, curve.point_count - 1):
+		var prev_dir = (curve.get_point_position(i) - curve.get_point_position(i - 1)).normalized()
+		var next_dir = (curve.get_point_position(i + 1) - curve.get_point_position(i)).normalized()
+		tangent_length = next_dir.length() / 3 
+		var tangent = (prev_dir + next_dir)
+		tangent.y = 0
+		tangent = tangent.normalized()
+		curve.set_point_in(i, -tangent * tangent_length)
+		curve.set_point_out(i, tangent * tangent_length)

entities/do_spline.gd.uid

@@ -0,0 +1 @@
+uid://bdw7xdf1lc3ud