You are given the three-dimensional coordinates of a point P1 (x1, y1, z1) and a point P2 (x2, y2, z2). You are also given the coordinates of the location point of a viewer (xV, yV, zV). You may assume that P1 and P2 are located on the same side of the viewer. Describe informally (you do not need to write out an algorithm) exactly how to determine if, from the point of view of the viewer, it is possible to see both points P1 and P2, or if one of these points is obstructed and not visible. In the latter case, describe how you can determine which is the occluded point.
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