Break apart loops into cythonizable ones

src/mcedit2/rendering/modelmesh.pyx

@@ -37,9 +37,13 @@ class BlockModelMesh(object):
         areaBlocks = self.sectionUpdate.areaBlocks
         faceQuadVerts = []
         
-        for y in xrange(1, 17):
-          yield
-          for z, x in itertools.product(xrange(1, 17), xrange(1, 17)):
+        cdef unsigned short y, z, x, ID, meta
+        cdef short dx, dy, dz,
+        cdef unsigned short nx, ny, nz, nID
+
+        for y in range(1, 17):
+            for z in range(1, 17):
+                for x in range(1, 17):
                     ID = areaBlocks[y, z, x]
                     if ID == 0:
                         continue