fix viewer

waves/viewer.py

@@ -297,7 +297,7 @@ class MeshViewer(QWidget, w.DisplayHook):
         for i in range(self.msh.elems.size()):
             e = self.msh.elems[i]
             n = e.nodes
-            if e.type() == tb.ELTYPE_HEX8:
+            if e.type() == tb.ElType_HEX8:
                 hexa = vtk.vtkHexahedron()
                 ids = hexa.GetPointIds()
                 for j in range(8):