Use Numpy instead of for loops in surf().
Use Numpy instead of for loops in surf().

chrisidefix/visvis,Alwnikrotikz/visvis,Alwnikrotikz/visvis,pbfy0/visvis,chrisidefix/visvis,chrisidefix/visvis,pbfy0/visvis,Alwnikrotikz/visvis,pbfy0/visvis