Question: Plot Riemann sums for double integals

 

I know that student[middlebox] can graph an approximation of an integral.
For example,
with(plots):
with(student):
f:=x->sin(x)+0.2*x+0.5:
a:=0: b:=16: N:=10:
C:=plot(f(x), x=a..b):
R:=middlebox(f(x), x=a..b, N):
display(C,R);


I need to know how to use Maple to do the same plotting for double integrals. Thanks for your help.
 

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