2 tracks

scenes/Railway.tscn

@@ -5,24 +5,41 @@
 [sub_resource type="Curve3D" id=1]
 bake_interval = 0.01
 _data = {
-"points": PoolVector3Array( -2.68413, 0, -1.21546, 2.68413, 0, 1.21546, -20.005, 0, -8.27961, -0.202576, 0, -2.12705, 0.202576, 0, 2.12705, -15.5484, 0.00448608, -2.35426, -1.06352, 0, -2.88671, 1.06352, 0, 2.88671, -16.1055, 0.000946045, 5.85007, -3.24122, 0, 0.202576, 3.24122, 0, -0.202576, -8.81272, 0, 10.4587, -0.468547, 0, 2.85805, 0.468547, 0, -2.85805, -3.58364, -0.000244141, 4.56199, -1.17756, 0, 3.41513, 1.17756, 0, -3.41513, -5.10296, -0.000259399, -3.5917, -2.78542, 0, -1.56996, 2.78542, 0, 1.56996, 3.2912, -0.000259399, -6.30449, -3.70976, 0, -1.39605, 3.70976, 0, 1.39605, 9.68509, -0.000259399, -0.0972629, 0, 0, 0, 0, 0, 0, 19.9658, -0.000259399, -1.11014 ),
+"points": PoolVector3Array( -2.68413, 0, -1.21546, 2.68413, 0, 1.21546, -20.005, 0, -8.27961, -0.202576, 0, -2.12705, 0.202576, 0, 2.12705, -15.5484, 0.00448608, -2.35426, -1.06352, 0, -2.88671, 1.06352, 0, 2.88671, -15.8992, 0.000904083, 5.83998, -3.24122, 0, 0.202576, 3.24122, 0, -0.202576, -8.81272, 0, 10.4587, -0.468547, 0, 2.85805, 0.468547, 0, -2.85805, -3.58364, -0.000244141, 4.56199, -1.16602, 4.07454e-10, 3.45615, 1.16602, -4.07454e-10, -3.45615, -5.10296, -0.000259399, -3.5917, -2.78542, 0, -1.56996, 2.78542, 0, 1.56996, 3.2912, -0.000259399, -6.30449, -3.70976, 0, -1.39605, 3.70976, 0, 1.39605, 9.68509, -0.000259399, -0.0972629, 0, 0, 0, 0, 0, 0, 19.9658, -0.000259399, -1.11014 ),
 "tilts": PoolRealArray( 0, 0, 0, 0, 0, 0, 0, 0, 0 )
 }
 
 [node name="Railway" type="Spatial"]
 script = ExtResource( 1 )
+_railPaths = [ NodePath("L"), NodePath("R") ]
+_centreLine = NodePath("Centreline")
+_railWidth = 0.07
+_railHeight = 0.12
+_railGauge = 0.8
 
-[node name="Path" type="Path" parent="."]
+[node name="Centreline" type="Path" parent="."]
 curve = SubResource( 1 )
 
-[node name="CSGPolygon" type="CSGPolygon" parent="."]
-snap = 0.01
-polygon = PoolVector2Array( -0.0540804, -0.000681907, -0.0495726, 0.0487114, 0.0444932, 0.0509578, 0.0464191, 0.000881314 )
+[node name="L" type="CSGPolygon" parent="."]
+polygon = PoolVector2Array( -0.47, 0, -0.47, 0.12, -0.33, 0.12, -0.33, 0 )
 mode = 2
-path_node = NodePath("../Path")
-path_interval_type = 1
-path_interval = 0.01
-path_simplify_angle = 0.2
+path_node = NodePath("../Centreline")
+path_interval_type = 0
+path_interval = 1.0
+path_simplify_angle = 0.0
+path_rotation = 2
+path_local = false
+path_continuous_u = true
+path_u_distance = 1.0
+path_joined = false
+
+[node name="R" type="CSGPolygon" parent="."]
+polygon = PoolVector2Array( 0.33, 0, 0.33, 0.12, 0.47, 0.12, 0.47, 0 )
+mode = 2
+path_node = NodePath("../Centreline")
+path_interval_type = 0
+path_interval = 1.0
+path_simplify_angle = 0.0
 path_rotation = 2
 path_local = false
 path_continuous_u = true

scripts/Railway.cs

@@ -1,8 +1,23 @@
 using Godot;
 using System;
 
+[Tool]
 public class Railway : Node
 {
+    [Export]
+    private NodePath[] _railPaths;
+
+
+    [Export]
+    private NodePath _centreLine;
+
+    [Export]
+    private float _railWidth;
+    [Export]
+    private float _railHeight;
+    [Export]
+    private float _railGauge = 1.0f;
+
     private Path _path = null;
     private Path Path
     {
@@ -10,7 +25,7 @@ public class Railway : Node
         {
             if (_path == null)
             {
-                _path = GetNode<Path>("Path");
+                _path = GetNode<Path>(_centreLine);
             }
             return _path;
         }
@@ -18,13 +33,46 @@ public class Railway : Node
 
     public Curve3D Curve => Path.Curve;
 
+    // the centre line should not have geometry directly associated with it.
+    // instead, two additional path/csgpolygon combinations should be managed
+    // in reference to the centre line for the left and right rails.
+
     // Called when the node enters the scene tree for the first time.
     public override void _Ready()
     {
     }
 
+    private void SetRailCrossSection()
+    {
+        // error checkin
+        if (_railPaths.Length != 2)
+            throw new Exception("need 2 rails");
+
+        // set rail geometry
+        for (int i = 0; i < 2; i++)
+        {
+            var rail = GetNode<CSGPolygon>(_railPaths[i]);
+
+            float w = _railWidth;
+            float h = _railHeight;
+            // horizontal offset of rail from centreline
+            float c = (-.5f + i) * _railGauge;
+
+            var polygon = new Vector2[4];
+            polygon[0] = new Vector2(c - w, 0);
+            polygon[1] = new Vector2(c - w, h);
+            polygon[2] = new Vector2(c + w, h);
+            polygon[3] = new Vector2(c + w, 0);
+            rail.Polygon = polygon;
+        }
+    }
+
     public override void _Process(float delta)
     {
+        if (Engine.EditorHint)
+        {
+            SetRailCrossSection();
+        }
     }
 
     public void AddPathFollower(PathFollow pathFollow)

scripts/Tracks.cs

@@ -1,22 +0,0 @@
-using Godot;
-using System;
-
-[Tool]
-public class Tracks : ImmediateGeometry
-{
-    private SpatialMaterial _m;
-
-    public override void _Ready()
-    {
-        // set up a material for imgui to use 
-        _m = new SpatialMaterial();
-        _m.VertexColorUseAsAlbedo = true;
-        _m.FlagsUnshaded = true;
-        this.MaterialOverride = _m;
-    }
-
-    public override void _Process(float delta)
-    {
-        GD.Print("hi!");
-    }
-}