I have added a new parameter to the iCelNavMeshParams class, polygonSearchBox. Here is a detailed description (copied from the parameter values post):
"Before creating a path, Detour finds the closest polygons in the navigation mesh to the origin and destination points. This parameter determines the dimensions of the bounding box where Detour will look for the closest polygons. The bounding box is represented by two vertices: (center + polygonSearchBox) and (center - polygonSearchBox), where center is the point one wants to find the closest polygon to.
This parameter is also used to determine if a low level path that was calculated by Detour reaches it's intended destination (Detour always returns a path, either to the destination or the closest possible point). If the distance between the two points, in each of the coordinates, is less then this parameter, then they are considered to be close enough for this purpose."
One simple way to understand this parameter using the demo application is clicking on a point that is not exactly on the navigation mesh. For example, consider clicking on the walls: the greater the y coordinate of the polygonSearchBox, the higher you can click on the wall and still have the path traced.
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