diff --git a/engine b/engine
index d0741af..a5adfac 160000
--- a/engine
+++ b/engine
@@ -1 +1 @@
-Subproject commit d0741afda706be3a7daa7ef0efd6559eb1824c3a
+Subproject commit a5adfacdfd6dbb52bd5d1438eef90a370976531e
diff --git a/game/batch.py b/game/batch.py
index f8e3d50..24294b4 100644
--- a/game/batch.py
+++ b/game/batch.py
@@ -13,14 +13,14 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from ctypes import c_ubyte, c_uint, c_void_p, POINTER, addressof
+from ctypes import c_ubyte, c_ushort, c_void_p, POINTER, addressof
 
 from engine import (
     buffer, INSTANCE_FLAG_SPAWNED, BATCH_MAX_SIZE, param_type, params_format,
     create_batch, fill_batch, draw_batch, destroy_batch)
 
-_c_ubyte_p = POINTER(c_ubyte)
-_c_uint_p = POINTER(c_uint)
+_flags_p = POINTER(c_ubyte)
+_mesh_p = POINTER(c_ushort)
 
 class Batch:
     __slots__ = ('_batch', 'vertices', 'max_size', 'size',
@@ -37,9 +37,9 @@ class Batch:
         self.max_size = max_size
         self.size = 0
         self.flags = buffer(c_ubyte, max_size)
-        self._flags = _c_ubyte_p(self.flags)
-        self.mesh = buffer(c_uint, max_size)
-        self._meshes = _c_uint_p(self.mesh)
+        self._flags = _flags_p(self.flags)
+        self.mesh = buffer(c_ushort, max_size)
+        self._meshes = _mesh_p(self.mesh)
         if nparams:
             self.param = tuple(map(lambda f: buffer(param_type(f), max_size), params_decls.values()))
             self._params = (c_void_p * nparams)(*map(addressof, self.param))
@@ -66,9 +66,9 @@ class Batch:
 
     def freeze(self, flags = None, mesh = None, **params):
         if flags is not None:
-            self._flags = None if flags else _c_ubyte_p(self.flags)
+            self._flags = None if flags else _flags_p(self.flags)
         if mesh is not None:
-            self._meshes = None if mesh else _c_uint_p(self.mesh)
+            self._meshes = None if mesh else _mesh_p(self.mesh)
         for name, value in params.items():
             if value is not None:
                 index = self._name[name]
diff --git a/game/resources.py b/game/resources.py
index 073d700..0a8e26d 100644
--- a/game/resources.py
+++ b/game/resources.py
@@ -139,7 +139,7 @@ class TextureData:
         _write_blob(file, self.pixels)
 
 class VerticesData:
-    __slots__ = 'name', 'vertices', 'indices', 'meshes'
+    __slots__ = 'name', 'vertices', 'indices', 'meshes', 'meshes_db'
 
     def __init__(self, name, vertices, indices, meshes):
         if len(vertices) % VERTEX_SIZE != 0:
@@ -147,17 +147,18 @@ class VerticesData:
         self.name = name
         self.vertices = vertices
         self.indices = indices
-        self.meshes = meshes
+        self.meshes = array('I', meshes.values())
+        self.meshes_db = dict(zip(meshes.keys(), range(len(meshes))))
 
     def __iter__(self):
         yield VERTEX_FORMAT
         yield len(self.vertices) // VERTEX_SIZE
         yield self.vertices
         yield self.indices
-        yield array('I', self.meshes.values())
+        yield self.meshes
 
     def get_mesh(self, name):
-        return self.meshes[name]
+        return self.meshes_db[name]
 
     @classmethod
     def from_archive(cls, file):
@@ -176,8 +177,8 @@ class VerticesData:
         _write_struct(file, 'III', len(self.vertices) // VERTEX_SIZE, len(self.indices), len(self.meshes))
         _write_array(file, self.vertices)
         _write_array(file, self.indices)
-        _write_array(file, array('I', self.meshes.values()))
-        for name in self.meshes.keys():
+        _write_array(file, self.meshes)
+        for name in self.meshes_db.keys():
             _write_string(file, name)
 
 class Archive: