That's one heck of a commit you've got there...

I may have got a bit behind with version control. A lot behind, in fact. Maybe I'll go back and split this sometime - then again, I probably won't. But hey, at least it's here!

src/main/java/electroblob/wizardry/item/IMultiTexturedItem.java

@@ -0,0 +1,23 @@
+package electroblob.wizardry.item;
+
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.ResourceLocation;
+
+/**
+ * Interface for items that change their texture depending on their metadata. This is mainly to facilitate use of the
+ * convenience method {@link electroblob.wizardry.client.model.WizardryModels#registerMultiTexturedModel(Item) WizardryModels.registerMultiTexturedModel(T)}. Also works well for {@code ItemBlock}s!
+ * @author Electroblob
+ * @since Wizardry 4.2
+ * @see ItemBlockMultiTexturedElemental
+ */
+public interface IMultiTexturedItem {
+	
+	/**
+	 * Returns the appropriate {@code ResourceLocation} for this item's model, based on the given itemstack.
+	 * @param stack The itemstack to return the model name for.
+	 * @return A {@code ResourceLocation} pointing to the appropriate model file. As with any other model, this should
+	 * include the domain (mod ID) and filename, without the rest of the filepath.
+	 */
+	ResourceLocation getModelName(ItemStack stack);
+}