Question: How to draw a mesh on this graph?

plot3d(x^2+y^2, x = -1 .. 1, y = -1 .. 1);

i searched this 

http://www.maplesoft.com/support/helpJP/Maple/view.aspx?path=NAG/d06abc

and

DelaunayTriangulation(points) in help file

is there any example to show how to use these?

 

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