diff --git a/obj2gbs.py b/obj2gbs.py
index 808ffb9..e33764a 100644
--- a/obj2gbs.py
+++ b/obj2gbs.py
@@ -4,6 +4,7 @@ from lib.packet import Packet
 from lib.fileutils import *
 from lib.game import Vec3, VecRGB, cross
 import argparse
+import sys
 
 GBS_VERSION = 0xaa0100be
 GBSFlagNormals = 0x0001
@@ -379,8 +380,18 @@ class GbsData:
 
             num_faces = sum([len(o.faces) for o in objects])
             print("%s vertices, %s uvs, %s normals, %s objects, %s materials, %s faces" % (len(vertices), len(uvs), len(normals), len(objects), len(materials), num_faces))
-            # assert len(objects) >= len(materials)
-            assert len(vertices) < 0xffff
+
+            try:
+                assert(len(vertices) < 32000)
+            except AssertionError:
+                print("Your model has %s vertices. Giants only supports a maximum of 32k vertices" % len(vertices))
+                sys.exit(1)
+
+            try:
+                assert(len(uv_ind) < 0xffff)
+            except AssertionError:
+                print("Your model has %s UV. Giants only supports a maximum of 65k UV per model" % len(uv_ind))
+                sys.exit(1)
 
             len_vertices = len(vertices)
             len_normals = len(normals)