LEGION Modifying entity behavior to walk on the right

Question

I have a scenario where I have two escalators going down and one escalator for entities going up. (Refer to image) 
 Currently, the red entities follow the red arrows (i.e. shortest distance) to the escalator. The blue entities follow the blue arrows into the corridor (i.e. shortest distance). However, this causes high density around the corner as the entities essentially run into each other. I find that this is unrealistic... realistically, the people represented by the red circles would follow the green dashed path in order to not run into the blue entities. In other words, pedestrians would stay to the right of the walking path. 
 
 I am emulating this behavior by using a series of focal nodes linked together to basically force the red entities to take a more realistic path by staying to the right of the walkway/corridor. 
 My question is whether this is best practices to emulate this entity behavior? Should another technique be used instead? 
 
 Thanks!

Sheetal Dhavane · Accepted Answer

hi Dilip,https://communities.bentley.com/cfs-file/__key/communityserver-discussions-components-files/343697/8078.Update1_5F00_Example_5F00_model.lgm 
 I have created simple example model in Update 1 to show how drift zone and focal node can be used to avoid entity density at corners. 
 Please let me know if you have any further questions and will be happy to help. 
 Thanks 
 Sheetal

Arindam Roy · Answer

Hello Dilip, Thank you for posting your queries. I would like to suggest to avoid the congestion around the corner you can add a focal node for red entity in mid of green lines. Although It would be better if you can raise a service request and attach your working file. We can suggest you a suitable workaround after investigation to emulate this entity behavior. 
 
 Thanks & Regards, Arindam

Yoothawee Haemapun · Answer

Hi Toufic, 
 This is Yoothawee, Sheetal's teammate, replying on her behalf. 
 First, You are right that the auto-navigation is the cause of entities following the shortest path. But please do not turn it off unless you are dealing with a model of very vast area and super huge crowd, for it means you will need to pave out all the navigation detail by your self. Not fun at all. The purpose of turning off the auto-nav is mainly to save the processing resource to maintain the simulation speed. Following the shortest path is the most default pedestrian behavior that would happen when there is enough space and least conflict with other people, that is what LEGION captures and reflects in its simulation algorithm. However, at this point, it can not automatically demonstrate the dynamic of various strategy people would response to different level of conflict yet. So you see the entities still stick with their 'basic instinct' of following the shortest path in all situations. There are a few ways to work around this limit. Though all need manipulation on specific spots, they take only one or two objects and least disruption to the autonav network. In the attached lgm, are a few examples whose outputs are captured in the image below. The left most image is the default counter-flow between two groups of people. The second left, a DZ (drift zone) of random deviation is introduced to the area around the turn. It is also set to apply Entity Step of direction preference: left. Random Diviation would make entities less determine to move straight to the shortest path while direction preference: left make each of them to step leftward when having conflict with other. The third and the right most are introduced with RG (route guide). A route guide will block the visibility of the targeted entities so they won't perceive the accessible space behind it. In this case I put a route guide that filter red people at the corner so they move away a bit from the corner, leaving the space for the green. So you can see that they have their own lanes and don't collide while counterflowing. The difference between the third and the rightmost image is the third one has only a single RG while I put 2 RGs in the rightmost to make the turn even smoother. 
 
 Hope this gives you some ideas :) 
 Thanks and Best Regards 
 Yoothawee 
 https://communities.bentley.com/cfs-file/__key/communityserver-discussions-components-files/343755/counterflow-test.lgm

LEGION Modifying entity behavior to walk on the right

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