From 8d0d0701ba563e4a7395c12be186b64b04787e27 Mon Sep 17 00:00:00 2001
From: Aada <adenyne@pm.me>
Date: Sat, 7 Mar 2026 10:29:28 +0200
Subject: [PATCH] Local Time Calculations

---
 scenes/MainScene.tscn | 43 ++++++++++++++++++++++++++++++--
 src/Main.cs           | 58 ++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 96 insertions(+), 5 deletions(-)

diff --git a/scenes/MainScene.tscn b/scenes/MainScene.tscn
index cfb06e6..b818221 100644
--- a/scenes/MainScene.tscn
+++ b/scenes/MainScene.tscn
@@ -100,7 +100,10 @@ mesh = SubResource("CylinderMesh_ygjfp")
 [node name="Pointer" type="Sprite3D" parent="TabContainer/Planet/VBoxContainer/SubViewportContainer/SubViewport/ZaWarudo/Icosphere" unique_id=1498529325]
 unique_name_in_owner = true
 modulate = Color(1, 0, 0, 1)
+pixel_size = 0.0018184
 billboard = 1
+no_depth_test = true
+fixed_size = true
 texture = ExtResource("5_ygjfp")
 
 [node name="Yaw" type="Node3D" parent="TabContainer/Planet/VBoxContainer/SubViewportContainer/SubViewport/ZaWarudo" unique_id=2073443785]
@@ -134,7 +137,8 @@ horizontal_alignment = 1
 [node name="SunAngle" type="HSlider" parent="TabContainer/Planet/VBoxContainer/MarginContainer/VBoxContainer" unique_id=1452623828]
 unique_name_in_owner = true
 layout_mode = 2
-max_value = 360.0
+max_value = 365.0
+tick_count = 14
 
 [node name="HSeparator" type="HSeparator" parent="TabContainer/Planet/VBoxContainer/MarginContainer/VBoxContainer" unique_id=1053749080]
 layout_mode = 2
@@ -147,7 +151,9 @@ horizontal_alignment = 1
 [node name="PlanetAngle" type="HSlider" parent="TabContainer/Planet/VBoxContainer/MarginContainer/VBoxContainer" unique_id=1574475714]
 unique_name_in_owner = true
 layout_mode = 2
-max_value = 360.0
+max_value = 24.0
+step = 0.25
+tick_count = 3
 
 [node name="PanelContainer" type="PanelContainer" parent="TabContainer/Planet" unique_id=716838825]
 layout_mode = 2
@@ -221,6 +227,26 @@ max_length = 5
 [node name="HSeparator" type="HSeparator" parent="TabContainer/Planet/PanelContainer/MarginContainer/VBoxContainer2/VBoxContainer" unique_id=1862016318]
 layout_mode = 2
 
+[node name="Label4" type="Label" parent="TabContainer/Planet/PanelContainer/MarginContainer/VBoxContainer2/VBoxContainer" unique_id=1664133820]
+layout_mode = 2
+text = "- World -"
+
+[node name="HBoxContainer5" type="HBoxContainer" parent="TabContainer/Planet/PanelContainer/MarginContainer/VBoxContainer2/VBoxContainer" unique_id=703726989]
+layout_mode = 2
+
+[node name="Margin" type="VSeparator" parent="TabContainer/Planet/PanelContainer/MarginContainer/VBoxContainer2/VBoxContainer/HBoxContainer5" unique_id=554179765]
+layout_mode = 2
+
+[node name="Label" type="Label" parent="TabContainer/Planet/PanelContainer/MarginContainer/VBoxContainer2/VBoxContainer/HBoxContainer5" unique_id=416863531]
+layout_mode = 2
+theme_override_colors/font_color = Color(0.4922884, 0.49228835, 0.49228835, 1)
+text = "Date: "
+
+[node name="Date" type="Label" parent="TabContainer/Planet/PanelContainer/MarginContainer/VBoxContainer2/VBoxContainer/HBoxContainer5" unique_id=716565176]
+unique_name_in_owner = true
+layout_mode = 2
+text = "-1"
+
 [node name="Label2" type="Label" parent="TabContainer/Planet/PanelContainer/MarginContainer/VBoxContainer2/VBoxContainer" unique_id=186838891]
 layout_mode = 2
 text = "- Point -"
@@ -254,6 +280,19 @@ unique_name_in_owner = true
 layout_mode = 2
 text = "-1"
 
+[node name="VSeparator2" type="VSeparator" parent="TabContainer/Planet/PanelContainer/MarginContainer/VBoxContainer2/VBoxContainer/HBoxContainer2" unique_id=521477767]
+layout_mode = 2
+
+[node name="Label2" type="Label" parent="TabContainer/Planet/PanelContainer/MarginContainer/VBoxContainer2/VBoxContainer/HBoxContainer2" unique_id=837979077]
+layout_mode = 2
+theme_override_colors/font_color = Color(0.4922884, 0.49228835, 0.49228835, 1)
+text = "Local Time:"
+
+[node name="LocalTime" type="Label" parent="TabContainer/Planet/PanelContainer/MarginContainer/VBoxContainer2/VBoxContainer/HBoxContainer2" unique_id=501459011]
+unique_name_in_owner = true
+layout_mode = 2
+text = "-1"
+
 [node name="Label3" type="Label" parent="TabContainer/Planet/PanelContainer/MarginContainer/VBoxContainer2/VBoxContainer" unique_id=1412781677]
 layout_mode = 2
 text = " - Plate -"
diff --git a/src/Main.cs b/src/Main.cs
index 2f58cc4..59ce51e 100644
--- a/src/Main.cs
+++ b/src/Main.cs
@@ -38,6 +38,7 @@ public partial class Main : Control
         UpdateStats();
         Projector.GatherPoints(_planetHelper, int.Parse(GetNode<LineEdit>("%Resolution").Text));
         AxialTiltChanged(GetNode<LineEdit>("%AxialTilt").Text);
+        UpdateTime();
     }
     
     Vector3 _pointerPosition = Vector3.Zero;
@@ -112,6 +113,7 @@ public partial class Main : Control
                     vertexPos *= _meshInstance.Transform.Basis.Inverse().Orthonormalized();
                     _pointerPosition = (Vector3)vertexPos + (vertexPos * (_vertex.Height + 0.01f) * 0.03f); // vertexPos * 1.01f;
                     GetNode<Node3D>("%Pointer").GlobalPosition = _pointerPosition;
+                    UpdateTime();
                 }
 
             }
@@ -128,16 +130,65 @@ public partial class Main : Control
         _planetHelper.Process();
         if (_sunRotating)
         {
+            _sunRotation = (double)(GetNode<HSlider>("%SunAngle").Value / 365.0);
             GetNode<Node3D>("%Sun").Rotation -= GetNode<Node3D>("%Sun").Rotation;
-            GetNode<Node3D>("%Sun").Rotation += new Vector3(0, (float)Mathf.DegToRad(GetNode<HSlider>("%SunAngle").Value), 0);
+            GetNode<Node3D>("%Sun").Rotation += new Vector3(0, Mathf.DegToRad((float)_sunRotation * 360f), 0);
+            UpdateTime();
         }
         if (_planetRotating)
         {
+            _planetRotation = (double)(GetNode<HSlider>("%PlanetAngle").Value / 24.0);
             _meshInstance.Rotation = Vector3.Zero;
-            _meshInstance.RotateY((float)Mathf.DegToRad(GetNode<HSlider>("%PlanetAngle").Value));
+            _meshInstance.RotateY((float)Mathf.DegToRad(_planetRotation * 360.0));
             _meshInstance.RotateZ(Mathf.DegToRad(_axialTilt));
+            UpdateTime();
         }
     }
+
+    public void UpdateTime()
+    {
+        double hours = GetLocalTime(GetNode<Node3D>("%Pointer").GlobalPosition, GetNode<Node3D>("%Sun").GlobalTransform.Basis.Z,
+            _meshInstance);
+        GetNode<Label>("%LocalTime").Text = DaysToTime(_sunRotation * 365.0, hours);
+        
+        GetNode<Label>("%Date").Text = DaysToDate(_sunRotation * 365.0, _planetRotation*24.0);
+    }
+
+    public static double GetLocalTime(Vector3 surfacePoint, Vector3 sunPos, Node3D planet)
+    {
+        Vector3 center = planet.GlobalTransform.Origin;
+        Vector3 axis = -planet.GlobalTransform.Basis.Y.Normalized();
+
+        Vector3 surfaceDir = (surfacePoint - center).Normalized();
+        Vector3 sunDir = (sunPos - center).Normalized();
+
+        surfaceDir = (surfaceDir - axis * surfaceDir.Dot(axis)).Normalized();
+        sunDir = (sunDir - axis * sunDir.Dot(axis)).Normalized();
+
+        double angle = Mathf.Atan2(
+            axis.Dot(surfaceDir.Cross(sunDir)),
+            surfaceDir.Dot(sunDir)
+        );
+
+        double hours = Mathf.PosMod(angle / Mathf.Tau * 24.0 + 12.0, 24.0);
+
+        return hours;
+    }
+    
+    public string DaysToDate(double days, double hours)
+    {
+        DateTime dt = new DateTime(1, 1, 1);
+        dt = dt.AddDays(days);
+        dt = dt.AddHours(hours);
+        return dt.ToString("'y'yyyy/'m'MM/'d'dd - 'h'HH':''m'mm':''s'ss");
+    }
+    public string DaysToTime(double days, double hours)
+    {
+        DateTime dt = new DateTime(1, 1, 1);
+        dt = dt.AddDays(days);
+        dt = dt.AddHours(hours);
+        return dt.ToString("'h'HH':''m'mm':''s'ss");
+    }
     public void UpdateStats()
     {
         if (_vertex != null)
@@ -239,6 +290,7 @@ public partial class Main : Control
     }
 
     private bool _sunRotating = false;
+    private double _sunRotation = 0.0;
     private float _axialTilt = 0f;
     public void SunAngleStart()
     {
@@ -250,7 +302,7 @@ public partial class Main : Control
         _sunRotating = false;
     }
     private bool _planetRotating = false;
-    private float _planetRotation = 0f;
+    private double _planetRotation = 0.0;
     public void PlanetAngleStart()
     {
         _planetRotating = true;