fix: preserve lilToon main texture UV tiling during Toon Standard conversion

Add MainTextureScale/MainTextureOffset properties to ToonStandardMaterialWrapper
and LilToonMaterial. Add abstract GetMainTextureST() to ToonStandardGenerator
base class and implement in LilToonToonStandardGenerator and GenericToonStandardGenerator.
Set main texture scale/offset in both ConvertToToonStandard() and GenerateMaterial()
paths.

Co-authored-by: kurotu <74851548+kurotu@users.noreply.github.com>

Author: Copilot

Packages/com.github.kurotu.vrc-quest-tools/Editor/Models/MaterialGenerators/GenericToonStandardGenerator.cs

@@ -177,6 +177,12 @@ protected override Color GetMainColor()
             throw new NotImplementedException();
         }
 
+        /// <inheritdoc/>
+        protected override (Vector2 Scale, Vector2 Offset) GetMainTextureST()
+        {
+            throw new NotImplementedException();
+        }
+
         /// <inheritdoc/>
         protected override ToonStandardMaterialWrapper.MatcapTypeMode GetMapcapType()
         {

Packages/com.github.kurotu.vrc-quest-tools/Editor/Models/MaterialGenerators/LilToonToonStandardGenerator.cs

@@ -35,6 +35,8 @@ protected override Material ConvertToToonStandard()
             newMaterial.Name = lilMaterial.Material.name;
 
             newMaterial.MainTexture = lilMaterial.Material.mainTexture;
+            newMaterial.MainTextureScale = lilMaterial.MainTextureScale;
+            newMaterial.MainTextureOffset = lilMaterial.MainTextureOffset;
             newMaterial.MainColor = Utils.ColorUtility.HdrToLdr(lilMaterial.Material.color);
 
             if (lilMaterial.UseNormalMap && Settings.useNormalMap)
@@ -800,6 +802,12 @@ protected override Color GetMainColor()
             return lilMaterial.Material.color;
         }
 
+        /// <inheritdoc/>
+        protected override (Vector2 Scale, Vector2 Offset) GetMainTextureST()
+        {
+            return (lilMaterial.MainTextureScale, lilMaterial.MainTextureOffset);
+        }
+
         /// <inheritdoc/>
         protected override ToonStandardMaterialWrapper.MatcapTypeMode GetMapcapType()
         {

Packages/com.github.kurotu.vrc-quest-tools/Editor/Models/MaterialGenerators/ToonStandardGenerator.cs

@@ -162,6 +162,7 @@ public AsyncCallbackRequest GenerateMaterial(MaterialBase material, UnityEditor.
                     {
                         newMaterial.MainTexture = t;
                         newMaterial.MainColor = new Color(1, 1, 1, 1);
+                        (newMaterial.MainTextureScale, newMaterial.MainTextureOffset) = GetMainTextureST();
                     }, mainPlatformOverride).WaitForCompletion();
                 }
                 else
@@ -384,6 +385,12 @@ public AsyncCallbackRequest GenerateTextures(MaterialBase material, UnityEditor.
         /// <returns>Main color.</returns>
         protected abstract Color GetMainColor();
 
+        /// <summary>
+        /// Gets the main texture scale and offset of the material.
+        /// </summary>
+        /// <returns>Scale and offset.</returns>
+        protected abstract (Vector2 Scale, Vector2 Offset) GetMainTextureST();
+
         /// <summary>
         /// Gets the material should use normal map.
         /// </summary>

Packages/com.github.kurotu.vrc-quest-tools/Editor/Models/Unity/LilToonMaterial.cs

@@ -77,6 +77,16 @@ internal enum MatCapBlendMode
         /// </summary>
         internal float Metallic => Material.GetFloat("_Metallic");
 
+        /// <summary>
+        /// Gets the main texture scale.
+        /// </summary>
+        internal Vector2 MainTextureScale => Material.GetTextureScale("_MainTex");
+
+        /// <summary>
+        /// Gets the main texture offset.
+        /// </summary>
+        internal Vector2 MainTextureOffset => Material.GetTextureOffset("_MainTex");
+
         /// <summary>
         /// Gets minimum brightness.
         /// </summary>

Packages/com.github.kurotu.vrc-quest-tools/Editor/Models/Unity/ToonStandardMaterialWrapper.cs

@@ -131,6 +131,24 @@ internal Texture MainTexture
             set => material.SetTexture("_MainTex", value);
         }
 
+        /// <summary>
+        /// Gets or sets the main texture scale.
+        /// </summary>
+        internal Vector2 MainTextureScale
+        {
+            get => material.GetTextureScale("_MainTex");
+            set => material.SetTextureScale("_MainTex", value);
+        }
+
+        /// <summary>
+        /// Gets or sets the main texture offset.
+        /// </summary>
+        internal Vector2 MainTextureOffset
+        {
+            get => material.GetTextureOffset("_MainTex");
+            set => material.SetTextureOffset("_MainTex", value);
+        }
+
         /// <summary>
         /// Gets or sets the albedo color.
         /// </summary>