Update app.py

app.py

@@ -58,7 +58,7 @@ def sample_info(sample_id_str, fieldn):
 
     with open("visu.obj", 'w') as f:
         for i in range(nb_nodes):
-            f.write(f"v {nodes[i,0]} {nodes[i,1]} {rgb_colors[i,0]} {rgb_colors[i,1]} {rgb_colors[i,2]}\n")
+            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_quads):
             f.write(f"f {quads[i,0] + 1} {quads[i,1] + 1} {quads[i,2] + 1} {quads[i,3] + 1}\n")