diff --git a/tools/gen_marching_cubes_conf.py b/tools/gen_marching_cubes_conf.py
index bcfe01d..949b2ed 100644
--- a/tools/gen_marching_cubes_conf.py
+++ b/tools/gen_marching_cubes_conf.py
@@ -148,26 +148,6 @@ def rot_z(vert):
     return rot_general(vert, 2, 0, 1)
 
 
-def sym_general(vert, normal):
-    return (
-        vert[0] if normal != 0 else 1-vert[0],
-        vert[1] if normal != 1 else 1-vert[1],
-        vert[2] if normal != 2 else 1-vert[2]
-    )
-
-
-def sym_x(vert):
-    return sym_general(vert, 0)
-
-
-def sym_y(vert):
-    return sym_general(vert, 1)
-
-
-def sym_z(vert):
-    return sym_general(vert, 2)
-
-
 def all_transforms():
     def compose2(fun1, fun2):
         return lambda x: fun1(fun2(x))
@@ -183,15 +163,11 @@ def all_transforms():
     for num_rx in range(4):
         for num_ry in range(4):
             for num_rz in range(4):
-                for syms in range(8):
-                    cur = compose(
-                        funcpow(rot_x, num_rx),
-                        funcpow(rot_y, num_ry),
-                        funcpow(rot_z, num_rz),
-                        sym_x if (syms & 0x1) else lambda x: x,
-                        sym_y if (syms & 0x2) else lambda x: x,
-                        sym_z if (syms & 0x4) else lambda x: x)
-                    output.append(cur)
+                cur = compose(
+                    funcpow(rot_x, num_rx),
+                    funcpow(rot_y, num_ry),
+                    funcpow(rot_z, num_rz))
+                output.append(cur)
     return output