diff --git a/engine b/engine
index 59d1368..f463db3 160000
--- a/engine
+++ b/engine
@@ -1 +1 @@
-Subproject commit 59d13684be90b9f942e68b478ab60755b528c8f5
+Subproject commit f463db316fc9eae9f26a83605d1c05f662b6e7de
diff --git a/game/obj2rkar.py b/game/obj2rkar.py
index 433b31c..9199847 100644
--- a/game/obj2rkar.py
+++ b/game/obj2rkar.py
@@ -219,9 +219,12 @@ class ObjArchive(Archive):
         assert name not in self.vertices_db.keys()
         #TODO: move to math
         def pack_10(_x):
-            return round(_x * (512.0 if _x < 0.0 else 511.0)) & 1023
+            assert _x >= -1.0 and _x <= 1.0
+            return round(_x * 511.0) & 1023
+            # return ((round(_x * 1023.0) - 1) // 2) & 1023
         def pack_u10(_x):
-            return round(_x * 1023.0) & 1023
+            assert _x >= 0.0 and _x <= 1.0
+            return round(_x * 1023.0)
         def pack_vertex(_px, _py, _pz, _nx, _ny, _nz, _s, _t, _tl):
             n = (pack_10(_nz) << 20) | (pack_10(_ny) << 10) | pack_10(_nx)
             t = ((_tl & 1023) << 20) | (pack_u10(_t) << 10) | pack_u10(_s)