diff --git a/src/main/java/ca/blarg/gdx/tilemap3d/assets/prefabs/TilePrefabJsonLoader.java b/src/main/java/ca/blarg/gdx/tilemap3d/assets/prefabs/TilePrefabJsonLoader.java
index df72d4d..834247f 100644
--- a/src/main/java/ca/blarg/gdx/tilemap3d/assets/prefabs/TilePrefabJsonLoader.java
+++ b/src/main/java/ca/blarg/gdx/tilemap3d/assets/prefabs/TilePrefabJsonLoader.java
@@ -1,6 +1,7 @@
 package ca.blarg.gdx.tilemap3d.assets.prefabs;
 
 import ca.blarg.gdx.Strings;
+import ca.blarg.gdx.assets.AssetLoadingException;
 import ca.blarg.gdx.tilemap3d.assets.tilemap.TileDataSerializer;
 import ca.blarg.gdx.tilemap3d.prefabs.TilePrefab;
 import com.badlogic.gdx.assets.AssetManager;
@@ -16,9 +17,9 @@ class TilePrefabJsonLoader {
 		return json.fromJson(JsonTilePrefab.class, file);
 	}
 
-	public static TilePrefab create(JsonTilePrefab definition, AssetManager assetManager) {
+	public static TilePrefab create(FileHandle file, JsonTilePrefab definition, AssetManager assetManager) {
 		if (Strings.isNullOrEmpty(definition.data))
-			throw new RuntimeException("Invalid prefab: no tile data.");
+			throw new AssetLoadingException(file.path(), "No tile data.");
 
 		TilePrefab prefab = new TilePrefab(definition.width, definition.height, definition.depth);
 
diff --git a/src/main/java/ca/blarg/gdx/tilemap3d/assets/prefabs/TilePrefabLoader.java b/src/main/java/ca/blarg/gdx/tilemap3d/assets/prefabs/TilePrefabLoader.java
index afa65a9..0029e15 100644
--- a/src/main/java/ca/blarg/gdx/tilemap3d/assets/prefabs/TilePrefabLoader.java
+++ b/src/main/java/ca/blarg/gdx/tilemap3d/assets/prefabs/TilePrefabLoader.java
@@ -28,7 +28,7 @@ public class TilePrefabLoader extends AsynchronousAssetLoader<TilePrefab, TilePr
 
 	@Override
 	public void loadAsync(AssetManager manager, String fileName, FileHandle file, TilePrefabParameters parameter) {
-		prefab = TilePrefabJsonLoader.create(definition, manager);
+		prefab = TilePrefabJsonLoader.create(file, definition, manager);
 	}
 
 	@Override
diff --git a/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemap/TileMapJsonLoader.java b/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemap/TileMapJsonLoader.java
index d84a34b..6238d63 100644
--- a/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemap/TileMapJsonLoader.java
+++ b/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemap/TileMapJsonLoader.java
@@ -1,6 +1,7 @@
 package ca.blarg.gdx.tilemap3d.assets.tilemap;
 
 import ca.blarg.gdx.Strings;
+import ca.blarg.gdx.assets.AssetLoadingException;
 import ca.blarg.gdx.tilemap3d.ChunkVertexGenerator;
 import ca.blarg.gdx.tilemap3d.TileChunk;
 import ca.blarg.gdx.tilemap3d.TileMap;
@@ -22,14 +23,14 @@ class TileMapJsonLoader {
 		return json.fromJson(JsonTileMap.class, file);
 	}
 
-	public static TileMap create(JsonTileMap definition, AssetManager assetManager) {
+	public static TileMap create(FileHandle file, JsonTileMap definition, AssetManager assetManager) {
 		if (definition.chunks == null || definition.chunks.size() == 0)
-			throw new RuntimeException("Invalid map: no chunks.");
+			throw new AssetLoadingException(file.path(), "No chunks.");
 		int numChunks = (definition.widthInChunks * definition.heightInChunks * definition.depthInChunks);
 		if (definition.chunks.size() != numChunks)
-			throw new RuntimeException("Inconsistent map dimensions and number of chunks.");
+			throw new AssetLoadingException(file.path(), "Inconsistent map dimensions and number of chunks.");
 		if (definition.tileMeshes == null)
-			throw new RuntimeException("No tile mesh collection specified.");
+			throw new AssetLoadingException(file.path(), "No tile mesh collection specified.");
 
 		TileMeshCollection tileMeshes = assetManager.get(definition.tileMeshes, TileMeshCollection.class);
 
@@ -46,7 +47,7 @@ class TileMapJsonLoader {
 			chunkVertexGenerator = new LitChunkVertexGenerator();
 			lighter = new LightSpreadingTileMapLighter(true, true);
 		} else
-			throw new RuntimeException("Invalid lighting mode.");
+			throw new AssetLoadingException(file.path(), "Invalid lighting mode.");
 
 		TileMap tileMap = new TileMap(
 			definition.chunkWidth, definition.chunkHeight, definition.chunkDepth,
diff --git a/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemap/TileMapLoader.java b/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemap/TileMapLoader.java
index 2f251dd..4a91e51 100644
--- a/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemap/TileMapLoader.java
+++ b/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemap/TileMapLoader.java
@@ -32,7 +32,7 @@ public class TileMapLoader extends AsynchronousAssetLoader<TileMap, TileMapLoade
 
 	@Override
 	public void loadAsync(AssetManager manager, String fileName, FileHandle file, TileMapParameters parameter) {
-		map = TileMapJsonLoader.create(definition, manager);
+		map = TileMapJsonLoader.create(file, definition, manager);
 	}
 
 	@Override
diff --git a/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemesh/MaterialTileMappingJsonLoader.java b/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemesh/MaterialTileMappingJsonLoader.java
index 7d865e7..7454675 100644
--- a/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemesh/MaterialTileMappingJsonLoader.java
+++ b/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemesh/MaterialTileMappingJsonLoader.java
@@ -1,5 +1,6 @@
 package ca.blarg.gdx.tilemap3d.assets.tilemesh;
 
+import ca.blarg.gdx.assets.AssetLoadingException;
 import ca.blarg.gdx.graphics.atlas.TextureAtlas;
 import ca.blarg.gdx.tilemap3d.tilemesh.MaterialTileMapping;
 import com.badlogic.gdx.assets.AssetManager;
@@ -12,9 +13,11 @@ class MaterialTileMappingJsonLoader {
 		return json.fromJson(JsonMaterialMapping.class, file);
 	}
 
-	public static MaterialTileMapping create(JsonMaterialMapping definition, AssetManager assetManager) {
+	public static MaterialTileMapping create(FileHandle file, JsonMaterialMapping definition, AssetManager assetManager) {
 		if (definition.materials == null || definition.materials.size() == 0)
-			throw new RuntimeException("No material mappings defined.");
+			throw new AssetLoadingException(file.path(), "No material mappings defined.");
+		if (definition.textureAtlas == null)
+			throw new AssetLoadingException(file.path(), "No texture atlas specified.");
 
 		TextureAtlas atlas = assetManager.get(definition.textureAtlas, TextureAtlas.class);
 
diff --git a/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemesh/MaterialTileMappingLoader.java b/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemesh/MaterialTileMappingLoader.java
index a704815..eba2666 100644
--- a/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemesh/MaterialTileMappingLoader.java
+++ b/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemesh/MaterialTileMappingLoader.java
@@ -32,7 +32,7 @@ public class MaterialTileMappingLoader extends AsynchronousAssetLoader<MaterialT
 
 	@Override
 	public void loadAsync(AssetManager manager, String fileName, FileHandle file, MaterialTileMappingParameters parameter) {
-		mapping = MaterialTileMappingJsonLoader.create(definition, manager);
+		mapping = MaterialTileMappingJsonLoader.create(file, definition, manager);
 	}
 
 	@Override
diff --git a/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemesh/TileMeshCollectionJsonLoader.java b/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemesh/TileMeshCollectionJsonLoader.java
index 11fff88..4adb8f5 100644
--- a/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemesh/TileMeshCollectionJsonLoader.java
+++ b/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemesh/TileMeshCollectionJsonLoader.java
@@ -1,5 +1,6 @@
 package ca.blarg.gdx.tilemap3d.assets.tilemesh;
 
+import ca.blarg.gdx.assets.AssetLoadingException;
 import ca.blarg.gdx.graphics.atlas.TextureAtlas;
 import ca.blarg.gdx.tilemap3d.tilemesh.TileMesh;
 import ca.blarg.gdx.tilemap3d.tilemesh.TileMeshCollection;
@@ -13,11 +14,11 @@ class TileMeshCollectionJsonLoader {
 		return json.fromJson(JsonTileMeshCollection.class, file);
 	}
 
-	public static TileMeshCollection create(JsonTileMeshCollection definition, AssetManager assetManager) {
+	public static TileMeshCollection create(FileHandle file, JsonTileMeshCollection definition, AssetManager assetManager) {
 		if (definition.tiles == null || definition.tiles.size() == 0)
-			throw new RuntimeException("No tiles defined.");
+			throw new AssetLoadingException(file.path(), "No tiles defined.");
 		if (definition.textureAtlas == null)
-			throw new RuntimeException("No texture atlas defined.");
+			throw new AssetLoadingException(file.path(), "No texture atlas defined.");
 
 		TextureAtlas atlas = assetManager.get(definition.textureAtlas, TextureAtlas.class);
 		TileMeshCollection collection = new TileMeshCollection(atlas);
diff --git a/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemesh/TileMeshCollectionLoader.java b/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemesh/TileMeshCollectionLoader.java
index 60edc39..9a2932d 100644
--- a/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemesh/TileMeshCollectionLoader.java
+++ b/src/main/java/ca/blarg/gdx/tilemap3d/assets/tilemesh/TileMeshCollectionLoader.java
@@ -43,7 +43,7 @@ public class TileMeshCollectionLoader extends AsynchronousAssetLoader<TileMeshCo
 
 	@Override
 	public void loadAsync(AssetManager manager, String fileName, FileHandle file, TileMeshCollectionParameters parameter) {
-		collection = TileMeshCollectionJsonLoader.create(definition, manager);
+		collection = TileMeshCollectionJsonLoader.create(file, definition, manager);
 	}
 
 	@Override