Fog performance optimizations

* Rename albedo cutoff to alpha cutoff
* Add LODs for calculating fog density
* Use 3D noise texture to speed up density calculation
* Eliminate low impact octaves from density calculation
* Add support for multiple emitters

2 files changed, 107 insertions, 6 deletions

diff --git a/Editor/generate_3d_noise.cs b/Editor/generate_3d_noise.cs
new file mode 100644
index 0000000..4352d99
--- /dev/null
+++ b/Editor/generate_3d_noise.cs
@@ -0,0 +1,67 @@
+// !! AI ARTIFACT !!
+// This code was originally generated by Claude 3.5 Sonnet.
+using UnityEngine;
+using UnityEditor;
+
+public class WhiteNoiseTextureGenerator : EditorWindow
+{
+    private int textureWidth = 32;
+    private int textureHeight = 32;
+    private int textureDepth = 32;
+    private string textureName = "WhiteNoiseTexture";
+
+    [MenuItem("Tools/yum_food/White Noise Texture Generator")]
+    public static void ShowWindow()
+    {
+        GetWindow<WhiteNoiseTextureGenerator>("White Noise Texture Generator");
+    }
+
+    private void OnGUI()
+    {
+        GUILayout.Label("White Noise Texture Generator", EditorStyles.boldLabel);
+
+        textureWidth = EditorGUILayout.IntField("Texture Width", textureWidth);
+        textureHeight = EditorGUILayout.IntField("Texture Height", textureHeight);
+        textureDepth = EditorGUILayout.IntField("Texture Depth", textureDepth);
+        textureName = EditorGUILayout.TextField("Texture Name", textureName);
+
+        if (GUILayout.Button("Generate Texture"))
+        {
+            if (textureWidth <= 0 || textureHeight <= 0 || textureDepth <= 0)
+            {
+                EditorUtility.DisplayDialog("Error", "Texture dimensions must be greater than zero.", "OK");
+                return;
+            }
+
+            GenerateWhiteNoiseTexture();
+        }
+    }
+
+    private void GenerateWhiteNoiseTexture()
+    {
+        Texture3D texture = new Texture3D(textureWidth, textureHeight, textureDepth, TextureFormat.RGBA32, false);
+        Color[] colors = new Color[textureWidth * textureHeight * textureDepth];
+
+        for (int z = 0; z < textureDepth; z++)
+        {
+            for (int y = 0; y < textureHeight; y++)
+            {
+                for (int x = 0; x < textureWidth; x++)
+                {
+                    int index = x + y * textureWidth + z * textureWidth * textureHeight;
+                    colors[index] = new Color(Random.value, Random.value, Random.value, 1f);
+                }
+            }
+        }
+
+        texture.SetPixels(colors);
+        texture.Apply();
+
+        string path = $"Assets/{textureName}.asset";
+        AssetDatabase.CreateAsset(texture, path);
+        AssetDatabase.SaveAssets();
+        AssetDatabase.Refresh();
+
+        EditorUtility.DisplayDialog("Success", $"White noise texture generated and saved at {path}", "OK");
+    }
+}
diff --git a/Editor/tooner.cs b/Editor/tooner.cs
index fdcb678..3c0b951 100644
--- a/Editor/tooner.cs
+++ b/Editor/tooner.cs
@@ -2033,10 +2033,16 @@ public class ToonerGUI : ShaderGUI {
     FloatProperty(bc, "Noise exponent");
     bc = FindProperty("_Gimmick_Fog_00_Normal_Cutoff");
     RangeProperty(bc, "Normal cutoff");
-    bc = FindProperty("_Gimmick_Fog_00_Albedo_Cutoff");
-    RangeProperty(bc, "Albedo cutoff");
+    bc = FindProperty("_Gimmick_Fog_00_Alpha_Cutoff");
+    RangeProperty(bc, "Alpha cutoff");
     bc = FindProperty("_Gimmick_Fog_00_Ray_Origin_Randomization");
     RangeProperty(bc, "Ray origin randomization");
+    bc = FindProperty("_Gimmick_Fog_00_Lod_Half_Life");
+    FloatProperty(bc, "LOD half life");
+    bc = FindProperty("_Gimmick_Fog_00_Noise");
+    TexturePropertySingleLine(
+        MakeLabel(bc, "Noise"),
+        bc);
 
     bc = FindProperty("_Gimmick_Fog_00_Emitter_Texture");
     TexturePropertySingleLine(
@@ -2046,16 +2052,44 @@ public class ToonerGUI : ShaderGUI {
     if (bc.textureValue) {
       EditorGUI.indentLevel += 1;
 
-      bc = FindProperty("_Gimmick_Fog_00_Emitter_Location");
+      bc = FindProperty("_Gimmick_Fog_00_Emitter0_Location");
       VectorProperty(bc, "Location (world)");
-      bc = FindProperty("_Gimmick_Fog_00_Emitter_Normal");
+      bc = FindProperty("_Gimmick_Fog_00_Emitter0_Normal");
       VectorProperty(bc, "Normal (world)");
-      bc = FindProperty("_Gimmick_Fog_00_Emitter_Scale_X");
+      bc = FindProperty("_Gimmick_Fog_00_Emitter0_Scale_X");
       FloatProperty(bc, "Scale (x)");
-      bc = FindProperty("_Gimmick_Fog_00_Emitter_Scale_Y");
+      bc = FindProperty("_Gimmick_Fog_00_Emitter0_Scale_Y");
       FloatProperty(bc, "Scale (y)");
+
       bc = FindProperty("_Gimmick_Fog_00_Emitter_Brightness");
       FloatProperty(bc, "Brightness");
+      bc = FindProperty("_Gimmick_Fog_00_Emitter_Lod_Half_Life");
+      FloatProperty(bc, "LOD half life");
+
+      for (int i = 0; i < 2; i++) {
+        bc = FindProperty($"_Gimmick_Fog_00_Emitter{i+1}_Enable_Static");
+        enabled = (bc.floatValue != 0.0);
+        EditorGUI.BeginChangeCheck();
+        enabled = Toggle($"Enable emitter {i+1}", enabled);
+        EditorGUI.EndChangeCheck();
+        bc.floatValue = enabled ? 1.0f : 0.0f;
+        SetKeyword($"_GIMMICK_FOG_00_EMITTER_{i+1}", enabled);
+
+        if (enabled) {
+          EditorGUI.indentLevel += 1;
+
+          bc = FindProperty($"_Gimmick_Fog_00_Emitter{i+1}_Location");
+          VectorProperty(bc, "Location (world)");
+          bc = FindProperty($"_Gimmick_Fog_00_Emitter{i+1}_Normal");
+          VectorProperty(bc, "Normal (world)");
+          bc = FindProperty($"_Gimmick_Fog_00_Emitter{i+1}_Scale_X");
+          FloatProperty(bc, "Scale (x)");
+          bc = FindProperty($"_Gimmick_Fog_00_Emitter{i+1}_Scale_Y");
+          FloatProperty(bc, "Scale (y)");
+
+          EditorGUI.indentLevel -= 1;
+        }
+      }
 
       EditorGUI.indentLevel -= 1;
     }