Don't think so. 


               X                   
                                     A
      B                       Y fso

                           C
         Z

Ascii graphic above includes polygon XYZ, fso is the point "for sure outside" as described above and points A and C for which there is no interesection between FSO-A or FSO-C and any line in the polygon.

However, for point B there is an intersection, very close to the vertex at Y (ie, it may be on XY or on YZ) and another on XZ.

In reply to Re^2: Determing whether point falls inside or outside a complex polygon by ww
in thread Determing whether point falls inside or outside a complex polygon by Anonymous Monk

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