It is not possible to handle player input because the tree cannot wait for some action while execute other in parallel

[mwss1996]

I was trying to build a character controller script using NPBehave.
I have a blackboard with a key called "isMovePressed" that turns true or false depending on player input.
So i used the BlackboardCondition to set the animator key to true of false if the "isMovePressed" value is updated.

The problem is that the Parallel node only keeps executing its children if a SUCCESS or FAILED status is returned by the children,
if i return PROGRESS the other actions will keep waiting and the rest of the tree will not work.

But if i return SUCCESS or FAILED the action DoStop() will never be called on the BlackboardCondition class and is not possible to set the animator "isWalking" boolean back to false when the condition fails.

So based on this i believe it is not possible to handle player input on this library, because the tree cannot wait for some action while execute other in parallel.

My question is if this is right or do i miss something?

return new Root(
    blackboard,
    new Parallel(
        Parallel.Policy.ALL,
        Parallel.Policy.ALL,
        new BlackboardCondition(
            "isMovePressed",
            Operator.IS_EQUAL,
            true,
            Stops.SELF,
            new Action(
                (abort) =>
                {
                    if (abort)
                    {
                        animator.SetBool("isWalking", false);
                        return Action.Result.SUCCESS;
                    }
                    animator.SetBool("isWalking", true);
                    return Action.Result.PROGRESS;
                }
            )
        ),
        new Action(() => Debug.Log("ONLY RUN WHEN THE FIRST RETURN SUCCESS OR FAILURE;"))
    )
);

[meniku]

The Parallel Node doesn't restart finished children. Out of my head I'm not sure if such an option would be a good addition to the library or not.

However I think you could use one of the following workarounds:

1. wrap the second action inside a Loop node
2. wrap the first action inside an Observer which updates the animation graph and make the action immediately return SUCCESS

I hope that helps