Difference between revisions of "SCI/FreeSCI/Pathfinding/Semantics"

The fourth polygon type is the contained access polygon. Unfortunately we could not test its semantics with the experimentator. The experimentator only works with a particular version of Sierra SCI that predates the addition of this fourth polygon type. In order to solve this problem we added a debug mode to FreeSCI to visualize the polygons on the display, using a different colour for each polygon type. We found a contained access polygon this way and we observed its semantics in Sierra SCI. Figure 8 illustrates these semantics. As the end point <i>t</i> is outside the polygon it cannot be reached. The path will end at the near point <i>t'</i> instead. The idea of this polygon is that it defines the outer boundary and Ego must stay inside of it, i.e. no path may exit this polygon. As any two polygons cannot intersect it follows that there can only be one such polygon. With more than one contained access polygon no path exists that is fully contained in each of those polygons.