Update app.py

app.py

@@ -52,7 +52,7 @@ def sample_info(sample_id_str, fieldn):
     nb_nodes = nodes.shape[0]
     
     triangles = plaid_sample.get_elements()['TRI_3']
-    nb_tris = tris.shape[0]
+    nb_tris = triangles.shape[0]
 
     assert field.shape[0] == nb_nodes
     
@@ -61,7 +61,7 @@ def sample_info(sample_id_str, fieldn):
             f.write(f"v {nodes[i,0]} {nodes[i,1]} {0.} {rgb_colors[i,0]} {rgb_colors[i,1]} {rgb_colors[i,2]}\n")
        
         for i in range(nb_tris):
-            f.write(f"f {quads[i,0] + 1} {quads[i,1] + 1} {quads[i,2] + 1} \n")
+            f.write(f"f {triangles[i,0] + 1} {triangles[i,1] + 1} {triangles[i,2] + 1} \n")
             
     # # generate colormap
     # if np.linalg.norm(field) > 0: