Astar navigator, element crossing the barrier

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Blandine de Romémont asked Jul 5, '17 Jacob Gillespie commented Jul 5, '17

Astar navigator, element crossing the barrier

Dear all,

In this example, simulation-transport-cuve-essai.fsm the element "transpalette" is liberaly crossing the barrier, even if it is on the member of the a star navigator. Do you have an explanation ? I have the same result if I put the 'transpalette" as the element doing the transport.

Thanks in advance,

Regards,

Blandine

Software Version:

FlexSim 17.0.5

astar

simulation-transport-cuve-essai.fsm (1003.7 KiB)

Answer 1 · 2017-07-05T15:03:02Z

Allister Wilson answered Jul 5, '17 Jacob Gillespie commented Jul 5, '17

The A* navigator doesn't consider the radius of objects when pathing, it simply paths around the barriers. The result is that in cases where your nodes are tightly packed but your traveler object is large, the edge of the object can intersect the barriers.

A few options :

- use preferred paths to guide the traveler along the path you want it to follow

- use barriers to block part of the walkable space near the walls in order to force the traveler down the middle

- increase the node spacing (this won't fix the issue, but can help to reduce it in some cases)

And one other option, which seems like the most appropriate in your case given the small scale and tight spaces : use network nodes / AGV paths to define the exact trajectories you want.

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Blandine de Romémont commented · Jul 05, 2017 at 03:24 PM

What does consider the Astar, if it does not consider the radius? Is it just the center of the object? I thought that the space of the object was considered.

I will try your inputs then, thanks.

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Jacob Gillespie ♦ Blandine de Romémont commented · Jul 05, 2017 at 05:39 PM

@Blandine de Romémont Travelers are treated like points using the center of the object. That means that the center of the object will never travel into barriers but the outer parts of the object still can.

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