parse 26.x texture objects in block models (redstone, glass, panes)

Since 26.x a model texture can be an object {"sprite": ..., "force_translucent": ...}
instead of a string. The block-model DTO only accepted strings, so those
models failed to load and rendered as the grey fallback cube: redstone
wire and every glass block and pane (110 models). Accept both forms in
ModelResolver (shared with ItemGeometry).

Edge-case test plugin: redstone/glass scene.

src/main/java/eu/mhsl/minecraft/pixelpics/assets/ModelResolver.java

@@ -29,6 +29,16 @@ public final class ModelResolver {
         return resolved;
     }
 
+    /** A texture value: a plain reference, or the {@code sprite} of a 26.x texture object; null otherwise. */
+    public static String textureRef(com.google.gson.JsonElement v) {
+        if (v == null) return null;
+        if (v.isJsonPrimitive()) return v.getAsString();
+        if (v.isJsonObject() && v.getAsJsonObject().has("sprite")) {
+            return v.getAsJsonObject().get("sprite").getAsString();
+        }
+        return null;
+    }
+
     private FlatModel resolve(ResourceLocation modelId, int depth) {
         ModelFileDto dto =
                 reader.readJson(AssetPaths.model(modelId), ModelFileDto.class).orElse(null);
@@ -47,7 +57,10 @@ public final class ModelResolver {
             }
         }
         if (dto.textures != null) {
-            textures.putAll(dto.textures);
+            dto.textures.forEach((key, value) -> {
+                String ref = textureRef(value);
+                if (ref != null) textures.put(key, ref);
+            });
         }
 
         return new FlatModel(textures, elements);

src/main/java/eu/mhsl/minecraft/pixelpics/assets/dto/ModelFileDto.java

@@ -1,5 +1,6 @@
 package eu.mhsl.minecraft.pixelpics.assets.dto;
 
+import com.google.gson.JsonElement;
 import java.util.List;
 import java.util.Map;
 
@@ -9,7 +10,8 @@ import java.util.Map;
  */
 public class ModelFileDto {
     public String parent;
-    public Map<String, String> textures;
+    // Values are texture refs ("block/stone", "#side") or, since 26.x, objects {"sprite": …, "force_translucent": …}.
+    public Map<String, JsonElement> textures;
     public List<ElementDto> elements;
 
     public static class ElementDto {

src/main/java/eu/mhsl/minecraft/pixelpics/render/entity/cem/ItemGeometry.java

@@ -6,6 +6,7 @@ import com.google.gson.JsonObject;
 import eu.mhsl.minecraft.pixelpics.assets.AssetPaths;
 import eu.mhsl.minecraft.pixelpics.assets.AssetReader;
 import eu.mhsl.minecraft.pixelpics.assets.BlockModelRegistry;
+import eu.mhsl.minecraft.pixelpics.assets.ModelResolver;
 import eu.mhsl.minecraft.pixelpics.assets.ResourceLocation;
 import eu.mhsl.minecraft.pixelpics.assets.TextureCache;
 import eu.mhsl.minecraft.pixelpics.assets.model.Direction;
@@ -183,13 +184,7 @@ public final class ItemGeometry {
             if (mo.has("textures")) {
                 for (Map.Entry<String, JsonElement> e :
                         mo.getAsJsonObject("textures").entrySet()) {
-                    JsonElement v = e.getValue();
-                    // 26.x textures may be objects ({"sprite": …, "force_translucent": …}).
-                    String val = v.isJsonPrimitive()
-                            ? v.getAsString()
-                            : (v.isJsonObject() && v.getAsJsonObject().has("sprite")
-                                    ? v.getAsJsonObject().get("sprite").getAsString()
-                                    : null);
+                    String val = ModelResolver.textureRef(e.getValue());
                     if (val != null) tex.putIfAbsent(e.getKey(), val);
                 }
             }