how to get a node event about sub nodes switching running? ?

[hydraParticipant]

Maybe I missed some info from the official document, I am thinking if there is a way to get an event triggered by node running result.

for example, there is a sequencer node as my behaviour tree start node which should be a “primeNode” , I can get sub node count by using outinConnections.count , in my case ,there are 3 sub action node under this root node ,they are actionA,B,C run one by one, so how can I get an event from the root sequence node when these 3 action nodes switching one by one?

I know I can add a custom action as a sub end action inside A/B/C action container, then send out a customized event to show which sub-branch node starts running or just finished ,but I think if there is a generic official API to get the connected node running state, especially the switching running event .

thanks

[GavalakisKeymaster]

Hello,

Hmm. I am not sure I completely understand the use case, but you can get the current status of a node by it’s “status” property.
Based on your example:

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for (var i = 0; i < outConnections.Count; i++){     var node = outConnections[i].targetNode;     var status = node.status; }

There is no event raised when a node changes status, since considering that nodes change status very frequently, that would possibly have a performance impact, especially considering the fact that I haven’t yet found a practical reason for such an event.
I think you have a very special case here 🙂 Would you mind sharing what you want to achieve? Maybe there is another solution to that.

Thank you.

[hydraParticipant]

hi, thanks for the reply.
ok, if change my question as a game example, an NPC has 3 action nodes: stand, walk, run when the NPC starts to run, there is some effect or animation coming out. I wish NodeCanvas has a system to notify me which node is running now and when it starts/ends, then I can connect this event to my code {some events manager }to trigger something as a generic way, rather than I write many different events in each action like running/walking …

if don’t have too many classes to subscribe it, then it shouldn’t have the performance issue. rather than checking the node status in update function running per frame.

[GavalakisKeymaster]

Hello again,

Thanks for the follow up. I think such an event can be added easily if you find it useful.
If you want, please drop me an email to “support_AT_paradoxnotion.com” and will send you a source code modification that adds the requested event when a node status is changed. If that ends up working nice for you, I will then implement the change into the next version.

Thank you 🙂

[Author]

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