Gaussian Spread

Resources/Weapons/Ice_Shotgun_Sawed_T0.tres

@@ -16,6 +16,6 @@ InfiniteAmmo = false
 ItemKey = &"ICE_SHOTGUN_SAWED"
 AmmoKey = &"ICE_AMMO"
 BulletsPerShot = 4
-SpreadAngle = 30.0
+SpreadAngle = 40.0
-RandomSpread = 0.0
+RandomSpread = 30.0
 _rotationOffset = 0.0

Resources/Weapons/Ice_Shotgun_Sawed_T1.tres

@@ -16,6 +16,6 @@ InfiniteAmmo = false
 ItemKey = &"ICE_SHOTGUN_SAWED_T1"
 AmmoKey = &"ICE_AMMO"
 BulletsPerShot = 4
-SpreadAngle = 25.0
+SpreadAngle = 30.0
-RandomSpread = 0.0
+RandomSpread = 28.0
 _rotationOffset = 0.0

Resources/Weapons/Ice_Shotgun_Sawed_T2.tres

@@ -16,6 +16,6 @@ InfiniteAmmo = false
 ItemKey = &"ICE_SHOTGUN_SAWED_T2"
 AmmoKey = &"ICE_AMMO"
 BulletsPerShot = 4
-SpreadAngle = 25.0
+SpreadAngle = 38.0
-RandomSpread = 0.0
+RandomSpread = 25.0
 _rotationOffset = 0.0

Resources/Weapons/Ice_Shotgun_T1.tres

@@ -17,5 +17,5 @@ ItemKey = &"ICE_SHOTGUN_T1"
 AmmoKey = &"ICE_AMMO"
 BulletsPerShot = 3
 SpreadAngle = 15.0
-RandomSpread = 0.0
+RandomSpread = 12.0
 _rotationOffset = 0.0

Resources/Weapons/Ice_Shotgun_T2.tres

@@ -17,5 +17,5 @@ ItemKey = &"ICE_SHOTGUN_T2"
 AmmoKey = &"ICE_AMMO"
 BulletsPerShot = 3
 SpreadAngle = 15.0
-RandomSpread = 0.0
+RandomSpread = 10.0
 _rotationOffset = 0.0

Resources/Weapons/Ice_Shotgun_Weapon.tres

@@ -17,5 +17,5 @@ ItemKey = &"ICE_SHOTGUN"
 AmmoKey = &"ICE_AMMO"
 BulletsPerShot = 3
 SpreadAngle = 15.0
-RandomSpread = 0.0
+RandomSpread = 15.0
 _rotationOffset = 0.0

Resources/Weapons/IcicleGun.tres

@@ -9,6 +9,7 @@
 script = ExtResource("2_m8dps")
 Name = &"Icicle Gun"
 BulletData = ExtResource("1_85ef1")
+Priority = 0
 RateOfFire = 0.3
 BulletCapacity = 5
 ReloadTime = 0.6
@@ -17,8 +18,8 @@ InfiniteAmmo = true
 ItemKey = &"ICICLE_GUN"
 AmmoKey = &""
 BulletsPerShot = 1
-SpreadAngle = 0.0
+SpreadAngle = 5.0
-RandomSpread = 0.0
+RandomSpread = 2.5
 _rotationOffset = 0.0
 ReloadSound = ExtResource("2_sd6j2")
 ShootSound = ExtResource("2_r2tre")

Scenes/test.tscn

@@ -716,6 +716,24 @@ script = ExtResource("82_fuaed")
 Item = ExtResource("4_swym2")
 AutoSpawn = true
 
+[node name="AmmoMarker7" type="Marker2D" parent="Parallax2D/Factory Tilemaps/Debug Room"]
+position = Vector2(-823.466, -584.726)
+script = ExtResource("82_fuaed")
+Item = ExtResource("4_swym2")
+AutoSpawn = true
+
+[node name="AmmoMarker8" type="Marker2D" parent="Parallax2D/Factory Tilemaps/Debug Room"]
+position = Vector2(-826.374, -604.114)
+script = ExtResource("82_fuaed")
+Item = ExtResource("4_swym2")
+AutoSpawn = true
+
+[node name="AmmoMarker9" type="Marker2D" parent="Parallax2D/Factory Tilemaps/Debug Room"]
+position = Vector2(-843.822, -603.871)
+script = ExtResource("82_fuaed")
+Item = ExtResource("4_swym2")
+AutoSpawn = true
+
 [node name="AmmoMarker2" type="Marker2D" parent="Parallax2D/Factory Tilemaps/Debug Room"]
 position = Vector2(-808, -397)
 script = ExtResource("82_fuaed")

Scripts/Utils/RandomStuff.cs

@@ -0,0 +1,40 @@
+using System;
+using Godot;
+
+namespace Cirno.Scripts.Utils;
+
+public static class RandomStuff
+{
+    public static double GaussianRandom(double mean = 0.0, double stdDev = 1.0)
+    {
+        // Box-Muller transform
+        float u1 = GD.Randf();
+        float u2 = GD.Randf();
+
+        // Ensure u1 is strictly > 0
+        while (u1 <= 0f)
+            u1 = GD.Randf();
+
+        float randStdNormal = Mathf.Sqrt(-2f * Mathf.Log(u1)) * Mathf.Sin(2f * Mathf.Pi * u2);
+        return mean + stdDev * randStdNormal;
+    }
+    
+    public static float GaussianClamped(float mean, float stdDev, float min, float max)
+    {
+        float value;
+        do
+        {
+            float u1 = GD.Randf();
+            float u2 = GD.Randf();
+
+            // Ensure u1 > 0 to avoid log(0)
+            while (u1 <= 0f) u1 = GD.Randf();
+
+            float randStdNormal = Mathf.Sqrt(-2f * Mathf.Log(u1)) * Mathf.Sin(2f * Mathf.Pi * u2);
+            value = mean + stdDev * randStdNormal;
+        }
+        while (value < min || value > max); // reject out-of-bounds values
+
+        return value;
+    }
+}

Scripts/Utils/RandomStuff.cs.uid

@@ -0,0 +1 @@
+uid://tkwp2w30xi32

Scripts/Weapon.cs

@@ -4,6 +4,7 @@ using System.Diagnostics;
 using Cirno.Scripts;
 using Cirno.Scripts.Components;
 using Cirno.Scripts.Resources;
+using Cirno.Scripts.Utils;
 
 public partial class Weapon : Node2D
 {
@@ -123,6 +124,18 @@ public partial class Weapon : Node2D
 			// Calculate angle offset for this bullet
 			float spreadOffset = -halfSpread + (spreadStep * i);
 
+			// Add random spread
+			if (WeaponData.RandomSpread > 0)
+			{
+				// Gaussian with mean = 0, stddev = WeaponData.RandomSpread
+				spreadOffset += RandomStuff.GaussianClamped(
+					mean: 0f,
+					stdDev: WeaponData.RandomSpread, // tuning knob
+					min: -halfSpread,
+					max: halfSpread
+				);
+			}
+			
 			// Rotate the ShootDirection by the spread angle
 			Vector2 spreadDirection = ShootDirection.Rotated(Mathf.DegToRad(spreadOffset));