Scilab Function  genfac3d -  compute facets of a 3D surface  
Calling Sequence
- [xx,yy,zz]=genfac3d(x,y,z,[mask])  
Parameters
  - xx,yy,zz  
    : matrices of size (4,n-1xm-1). xx(:,i) ,yy(:,i) and zz(:,i)  are respectively the x-axis, y-axis and z-axis coordinates of the 4 points of  the ith four sided facet.
  
- x  
    : x-axis coordinates vector of size m.
  
- y  
    : y-axis coordinates vector of size n.
  
- z  
    : matrix of size (m,n). z(i,j) is the value of the surface at the point (x(i),y(j)).
  
- mask  
    : boolean optional matrix with same size as z used to select  the entries of z to be represented by facets.
  
Description
  
    genfac3d computes a four sided facets representation of a 3D surface 
    z=f(x,y) defined by x, y and z.
  
  
Examples
t=[0:0.3:2*%pi]'; z=sin(t)*cos(t');
[xx,yy,zz]=genfac3d(t,t,z);
plot3d(xx,yy,zz)
 
See Also