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From the docstring:

""region" - (default: None) If region is given, it must be a function of two variables. Only segments of the surface where region(x,y) returns a number >0 will be included in the plot."

Your region argument is a list of four expressions. Apparently, you wish to exclude the neighborhood of{(0, 0),(0,1),(1, 0), (1,1)}. I'd try:

region=lambda(x,z)((x^2+z^2)>1/100)*(((x-1)^2+z^2)>1/100)*(x^2+(z-1)^2)>1/100)*(((x-1)^2+(z-1)^2)>1/100)

which should return True (i. e. 1) except in the target neighborhoods, where it should return 0.

HTH,

From the docstring:

""region" - (default: None) If region is given, it must be a function of two variables. Only segments of the surface where region(x,y) returns a number >0 will be included in the plot."

Your region argument is a list of four expressions. Apparently, you wish to exclude the neighborhood of{(0, 0),(0,1),(1, 0), (1,1)}. I'd try:

region=lambda(x,z)((x^2+z^2)>1/100)*(((x-1)^2+z^2)>1/100)*(x^2+(z-1)^2)>1/100)*(((x-1)^2+(z-1)^2)>1/100)
region=lambda x,z: (x^2+z^2)>1/100)*(((x-1)^2+z^2)>1/100)*(x^2+(z-1)^2)>1/100)*(((x-1)^2+(z-1)^2)>1/100)

which should return True (i. e. 1) except in the target neighborhoods, where it should return 0.

HTH,