Migrate UnlitTranpsarentZWrite

Assets/VRM10/Runtime/Migration/Materials/MigrationLegacyUnlitMaterial.cs

@@ -6,6 +6,7 @@ namespace UniVRM10
 {
     /// <summary>
     /// 過去の UniVRM において、KHR_materials_unlit 拡張を使わず、VRM 拡張を用いて Unlit を表現していた Material をマイグレーションする。
+    /// KHR_materials_unlit を用いてマイグレーションする.
     /// </summary>
     public static class MigrationLegacyUnlitMaterial
     {
@@ -59,6 +60,9 @@ namespace UniVRM10
                     unlitMaterial.alphaMode = "MASK";
                     unlitMaterial.alphaCutoff = MigrationMaterialUtil.GetCutoff(vrm0XMaterial);
                     return unlitMaterial;
+                case "VRM/UnlitTransparentZWrite":
+                    // NOTE: ZWrite マテリアルのみ、MToon にマイグレーションするため、別処理.
+                    return MigrationUnlitTransparentZWriteMaterial.Migrate(vrm0XMaterial, materialName);
                 default:
                     return null;
             }

Assets/VRM10/Runtime/Migration/Materials/MigrationUnlitTransparentZWriteMaterial.cs

@@ -0,0 +1,60 @@
+using System;
+using UniGLTF;
+using UniGLTF.Extensions.VRMC_materials_mtoon;
+using UniJSON;
+
+namespace UniVRM10
+{
+    /// <summary>
+    /// 過去の UniVRM の "VRM/UnlitTransparentZWrite" シェーダをマイグレーションする.
+    /// 他の Unlit シェーダと違い、VRMC_materials_mtoon を用いてマイグレーションする.
+    /// </summary>
+    public static class MigrationUnlitTransparentZWriteMaterial
+    {
+        private const string MigrationMToon10SpecVersion = "1.0-draft";
+
+        public static glTFMaterial Migrate(JsonNode vrm0XMaterial, string materialName)
+        {
+            var baseColorFactor = MigrationMaterialUtil.GetBaseColorFactor(vrm0XMaterial);
+            var baseColorTexture = MigrationMaterialUtil.GetBaseColorTexture(vrm0XMaterial);
+            var emissiveTexture = new glTFMaterialEmissiveTextureInfo
+            {
+                index = baseColorTexture.index,
+                extensions = baseColorTexture.extensions,
+            };
+
+            var mtoonMaterial = new glTFMaterial
+            {
+                name = materialName,
+                extensions = new glTFExtensionExport().Add(
+                    glTF_KHR_materials_unlit.ExtensionName,
+                    new ArraySegment<byte>(glTF_KHR_materials_unlit.Raw)
+                ),
+                pbrMetallicRoughness = new glTFPbrMetallicRoughness
+                {
+                    baseColorFactor = new [] {0f, 0f, 0f, baseColorFactor[3]}, // black + _Color.a
+                    baseColorTexture = baseColorTexture, // _MainTex
+                    metallicFactor = 0f,
+                    roughnessFactor = 1f,
+                },
+                alphaMode = "BLEND",
+                alphaCutoff = 0.5f,
+                doubleSided = false,
+                emissiveFactor = new [] {baseColorFactor[0], baseColorFactor[1], baseColorFactor[2]}, // _Color.rgb
+                emissiveTexture = emissiveTexture,
+            };
+
+            var mtoon10 = new VRMC_materials_mtoon
+            {
+                SpecVersion = MigrationMToon10SpecVersion,
+                TransparentWithZWrite = true, // transparent with zWrite
+                RenderQueueOffsetNumber = 0,
+                ShadeColorFactor = new [] {0f, 0f, 0f}, // black
+                OutlineWidthMode = OutlineWidthMode.none // disable outline
+            };
+            UniGLTF.Extensions.VRMC_materials_mtoon.GltfSerializer.SerializeTo(ref mtoonMaterial.extensions, mtoon10);
+
+            return mtoonMaterial;
+        }
+    }
+}

Assets/VRM10/Runtime/Migration/Materials/MigrationUnlitTransparentZWriteMaterial.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 281c0ecbae8e489db4c86a553636ae44
+timeCreated: 1635426676