In crowd animation, you can use the Vector Field space warp as a space warp behavior. A vector field allows crowd members to move automatically around obstacle objects of any shape, following the object contours. It also lets crowd members move within the confines of an enclosed space, such as a room, while avoiding the walls. You can also use Vector Field space warps to control particle motion.
The Vector Field space warp works by generating a number of vectors that surround an object and are perpendicular to its surface. Crowd animation then uses these vectors to guide delegates around the object by moving them perpendicular to the vectors.