// quad.fe
// Simple skew quadrilateral.  Illustrates fixed edges bounding a surface.
// This is about as simple as it gets, folks.


vertices
1   0  0  1   fixed
2   2  0  0   fixed
3   2  2  1   fixed
4   0  2  0   fixed

edges
1   1  2 fixed
2   2  3 fixed
3   3  4 fixed
4   4  1 fixed

faces
1   1 2 3 4 

read

// typical evolution
gogo := { r; 
	  g 5;
	  r;
	  g 12;
	  r;
	  g 14;
	  hessian_normal;
	  hessian; hessian;
	  }