diff --git a/engine b/engine
index f463db3..7384a01 160000
--- a/engine
+++ b/engine
@@ -1 +1 @@
-Subproject commit f463db316fc9eae9f26a83605d1c05f662b6e7de
+Subproject commit 7384a014ff0ec184bc970be39cf6d7e6e1fae6b4
diff --git a/game/batch.py b/game/batch.py
index d70f451..25297a0 100644
--- a/game/batch.py
+++ b/game/batch.py
@@ -16,7 +16,7 @@
 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,
+    buffer, INSTANCE_FLAG_SPAWNED, BATCH_MAX_SIZE, vertex_type, vertex_format,
     create_batch, fill_batch, draw_batch, destroy_batch)
 
 _flags_t = c_ubyte
@@ -32,7 +32,7 @@ class Batch:
         assert max_size <= BATCH_MAX_SIZE
         nparams = len(params_decls)
         if nparams:
-            self._batch = create_batch(vertices._vertices, max_size, params_format(*params_decls.values()))
+            self._batch = create_batch(vertices._vertices, max_size, vertex_format(*params_decls.values()))
         else:
             self._batch = create_batch(vertices._vertices, max_size, None)
         self.vertices = vertices
@@ -43,7 +43,7 @@ class Batch:
         self.mesh = buffer(_mesh_t, 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.param = tuple(map(lambda f: buffer(vertex_type(f), max_size), params_decls.values()))
             self._params = (c_void_p * nparams)(*map(addressof, self.param))
             self._name = dict(zip(params_decls.keys(), range(nparams)))
             for name, value in zip(params_decls.keys(), self.param):
diff --git a/game/game.py b/game/game.py
index a349cdc..8a17fee 100644
--- a/game/game.py
+++ b/game/game.py
@@ -137,7 +137,7 @@ def create_scene(keyboard, mouse):
     rock_mesh = tiles_vertices.get_mesh('rock')
     mud_mesh = tiles_vertices.get_mesh('mud')
     lava_mesh = tiles_vertices.get_mesh('lava')
-    tiles_batch = Batch(Vertices(*tiles_vertices), generated.size ** 2, translation = PARAM_FORMAT_VEC3_SHORT)
+    tiles_batch = Batch(Vertices(*tiles_vertices), generated.size ** 2, translation = VERTEX_FORMAT_VEC3_SHORT)
 
     #TODO: generator & for real
     vc = generated.volcano_c
@@ -179,8 +179,8 @@ def create_scene(keyboard, mouse):
     cube_mesh = tests_vertices.get_mesh('cube')
     clouds_mesh = tests_vertices.get_mesh('clouds')
     tests_batch = Batch(Vertices(*tests_vertices), 3,
-        translation = PARAM_FORMAT_VEC3_FLOAT,
-        orientation = PARAM_FORMAT_MAT3_INT10 | PARAM_FORMAT_NORMALIZE)
+        translation = VERTEX_FORMAT_VEC3_FLOAT,
+        orientation = VERTEX_FORMAT_MAT3_INT10 | VERTEX_FORMAT_NORMALIZE)
     blob_forward = math.vec3_normalize((sun_direction[0], sun_direction[1], 0.0))
     blob_right = math.vec3_cross(blob_forward, math.vec3_up)
     blob_orientation = mat3(vec3(*blob_right), vec3(*blob_forward), vec3_up)