30.03.2016, 09:10
The picture you posted, is valid only for 2D polygons which is only fit for 2D pathfinding. In our case, everything is in 3D and a single model contains various sub collision shapes such as rectangles, spheres, mesh, etc. Most of the models contains spheres as sub collision shapes, now tell me does sphere has vertices? The answer is no. Your NPC will get confused when a spherical object/model is placed in front of him.