/// <summary>
/// Add a cone, defined by the center (`x', `y', `z') of its first circular
/// face, the 3 components of the vector (`dx', `dy', `dz') defining its axis
/// and the two radii `r1' and `r2' of the faces (these radii can be zero). If
/// `tag' is positive, set the tag explicitly; otherwise a new tag is selected
/// automatically. `angle' defines the optional angular opening (from 0 to
/// 2*Pi). Return the tag of the cone.
/// </summary>
public int AddCone(double x, double y, double z, double dx, double dy, double dz, double r1, double r2, int tag = -1, double angle = 2 *Math.PI)
{
var api = GMshNativeMethods.gmshModelOccAddCone(x, y, z, dx, dy, dz, r1, r2, tag, angle, ref ierr);
if (ierr != 0)
{
throw new GMshException(ierr);
}
return(api);
}