[Gmsh] How to create structured mesh on non-rectangular surface?

[蔡园武]

Hello, everyone!
I need to generate a structured mesh on a non-rectangular surface, but I
don't know how to do that.
For example, how to generate structured mesh on a surface defined by four
points:
Point(1)={0,0,0,lc};
Point(2)={1,0,0,lc};
Point(3)={1,2,0,lc};
Point(4)={0,1,0,lc};

A simple Extrude command can not do this.
I'm not familar with the geometry operations, so if anyone know the answer,
please tell me.
Thank you!

-- 
Cai Yuanwu  蔡园武
Dept. of Engineering Mechanics,
Dalian University of Technology,
Dalian 116024, China
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