Impulses: Difference between revisions

Latest revision as of 16:33, 2 April 2024

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Impulses

Impulses (or Calls) are triggered actions. They normally do not have a duration (unless using Async calls) and happen in a singular instantaneous moment. Some examples of Impulses could be when a user clicks a button, when a user collides with something such as the ground, or when a object gets duplicated.

Impulses have some data associated with them. This data includes:

The user who sent the impulse, which can be read via a Local User node during the impulse.
The time of the impulse, read by the WorldTime (and similar) nodes.

When a ProtoFlux value is connected solely into nodes that receive Impulses, the value is no longer evaluated every game update but only when the node is impulsed. This is useful to optimize performance as instead of doing a constant evaluation, you wait until a Impulse is received to evaluate. A heavy computations which benefits from this approach is FindChildByName which searches an entire hierarchy when it is evaluated. In this scenario, the search only has to be done once during the Impulse, and then optionally it can be cached using a Write node.

Non-Asynchronous Impulse Code can freeze the game engine until the code is finished. This can cause performance issues in certain scenarios like when using loops with lots of iterations, and is why it is recommended to make such lengthy computations Asynchronous so they can be dealt with over a longer time period, and to not evaluate such things constantly.

Async

Async or Async Impulses are a way to take your code and run it over more than one engine update cycle. Async Impulses are required to run nodes that are in the ProtoFlux Async category as these nodes require a Async Operation to start executing and will often take some time to complete what they do. Nodes like this include but are not limited to Delays, Cloud variable nodes, and ASync Whiles.

Async is a way in some cases to reduce lag in some code as instead of halting the engine while you do a bunch of work in one update, you can spread the work over time and over multiple updates instead.

Async however will not completely remove lag from actions done in world. So if you create a massive amount of data that has to be networked all at once, then making the code Async will not always prevent the lag from occurring. Likewise if running Async code constantly it can also cause performance issues.

Async is currently not multi-threaded which is talked about in this video (at 40:00): link to the video at the specified time

Contexts

Contexts are a way for ProtoFlux to store a state of local variables in the scope of the executing code. A new context can be created using the StartAsyncTask node. Variables in the context will still be able to be accessed and read with the same values even if Delays are used. A context can be thought of as what data is available during a certain Impulse.

For variable types, see Store, Local, and Data Model Store pages.

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 {{Stub}}
+See Also: [[Dynamic Impulses]]
 == Impulses ==
-Impulses are a way for ProtoFlux to do actions that happen during a specific time, rather than a continuous per-game-tick basis. They can be considered as a sort of action. When an impulse is triggered it's like an event in a game. When the user hits a button that sends an impulse, when your feet visibly hit the ground, that can send an impulse. When you fill a glass entirely, an impulse can be sent.
+Impulses (or Calls) are triggered actions. They normally do not have a duration (unless using Async calls) and happen in a singular instantaneous moment. Some examples of Impulses could be when a user clicks a button, when a user collides with something such as the ground, or when a object gets duplicated.
-Impulses have data associated with them. This data includes
+Impulses have some data associated with them. This data includes:
-* The user who sent the impulse, which can be read via a [[ProtoFlux:Local User|Local User]] Node.
+* The user who sent the impulse, which can be read via a [[ProtoFlux:Local User|Local User]] node during the impulse.
-* The index of the impulse of the total number of impulses sent down the line.
+* The time of the impulse, read by the [[ProtoFlux:World_Time_Float|WorldTime]] (and similar) nodes.
-* the start time the impulse was sent.
-Think of Impulses as an instant action, that doesn't have a duration, but rather an instant moment in time which all code must run before the next smallest unit of time can happen.
+When a ProtoFlux value is connected solely into nodes that receive Impulses, the value is no longer evaluated every game update but only when the node is impulsed. This is useful to optimize performance as instead of doing a constant evaluation, you wait until a Impulse is received to evaluate. A heavy computations which benefits from this approach is [[ProtoFlux:Find_Child_By_Name|FindChildByName]] which searches an entire hierarchy when it is evaluated. In this scenario, the search only has to be done once during the Impulse, and then optionally it can be cached using a Write node.
-When a protoflux value socket is connected solely into nodes that recieve Impulses, the value is no longer calculated every game tick but only when the node is impulsed. This is useful if you want to search the entire root for a slot, but then [[ProtoFlux:Write|Write]] it to a variable to keep it for later. In this scenario, the search only has to be done for one frame, and then the cached value can be used instead. Searching the entire root is extremely costly, but if the value is written and then cached, the performance impact is negligible.
+{{Note|Non-Asynchronous Impulse Code can freeze the game engine until the code is finished. This can cause performance issues in certain scenarios like when using loops with lots of iterations, and is why it is recommended to make such lengthy computations Asynchronous so they can be dealt with over a longer time period, and to not evaluate such things constantly.|warning}}
-{{Note|Non Async Impulse Code will freeze the game engine loop until the code is finished. This can cause huge performance issues, and is why it is highly recommended to make large computations Async|danger}}
 == Async ==
-Async or Async Impulses are a way to take your code and run it over more than one engine update cycle. Async Impulses are required to run nodes that are in the ProtoFlux Async category as these nodes require a Async Operation to start executing. Nodes like this include but are not limited to [[ProtoFlux:Delay|Delays]], [[:Category:ProtoFlux:Variables:Cloud|Cloud variable nodes]], and [[ProtoFlux:ASync While|ASync Whiles]].
+Async or Async Impulses are a way to take your code and run it over more than one engine update cycle. Async Impulses are required to run nodes that are in the ProtoFlux Async category as these nodes require a Async Operation to start executing and will often take some time to complete what they do. Nodes like this include but are not limited to [[ProtoFlux:Delay|Delays]], [[:Category:ProtoFlux:Variables:Cloud|Cloud variable nodes]], and [[ProtoFlux:ASync While|ASync Whiles]].
 Async is a way in some cases to reduce lag in some code as instead of halting the engine while you do a bunch of work in one update, you can spread the work over time and over multiple updates instead.
-Async however will not completely remove lag from actions done in world. So if you create a massive amount of data that has to be networked all at once, then making the code Async will not always prevent the lag from occurring.
+Async however will not completely remove lag from actions done in world. So if you create a massive amount of data that has to be networked all at once, then making the code Async will not always prevent the lag from occurring. Likewise if running Async code constantly it can also cause performance issues.
-Async is currently not multi-threaded which is said in this video (at 40:00): https://www.youtube.com/watch?v=1losWav_AZQ
+Async is currently not multi-threaded which is talked about in this video (at 40:00): [https://youtu.be/1losWav_AZQ?t=2392 link to the video at the specified time]
 == Contexts ==
-Contexts are a way for the game to store a frozen state of the game in which to keep values the way they are during execution. This means if you use a [[ProtoFlux:Fire On True|Fire On True]], [[ProtoFlux:Fire On False|Fire On False]], or a [[ProtoFlux:Fire On Change|Fire On Change]] the data in the entire world during the impulse generated by the nodes will not change except when acted upon by the code. This is why functions like creating dynamic variables, moving them, or checking protoflux indirectly will not work instantly and will require a new context from a few game ticks later.
+Contexts are a way for ProtoFlux to store a state of local variables in the scope of the executing code. A new context can be created using the [[ProtoFlux:Start_ASync_Task|StartAsyncTask]] node. Variables in the context will still be able to be accessed and read with the same values even if Delays are used. A context can be thought of as what data is available during a certain Impulse.
-For example, if you change the Position of a [[Slot]], and then check a value that should change via a write node based on the slot's position, it will not update. This is because the other impulse chain is waiting for that context to be released, and will not fire till the next game tick. New contexts can be generated through a delay, or by a new impulse in later game ticks.
-On the contrary if a value that is being driven by other protoflux or components is checked during our impulse, the code driving it will update the value first (Also known as Evaluating) before our code uses the final value for the execution.
-[[ProtoFlux:Local|Local Nodes]] will be the default value for it's data type till it is written to during a context. During that context, the local node will keep the value from every write and change to it. Once the context is released, the value instantly returns to the default value, discarding the data, preventing it from being seen or networked. However, if it's value is written to a [[ProtoFlux:Data Model Store|Data Model Store]] it will persist across all contexts, allowing it to be seen by everyone in the session through the network.
-A [[ProtoFlux:Data Model Store|Data Model Store]] on the other hand will allow writes to it that will persist across contexts, allowing for another impulse or script to read the variable later and act on it. This is good for storing your final value after a massive calculation as a value for a smaller drive script. If a [[ProtoFlux:Data Model Store|Data Model Store]] is written to multiple times in a context, the last value the data model store has after the context is the value that gets networked.
+For variable types, see [[ProtoFlux:Store|Store]], [[ProtoFlux:Local|Local]], and [[ProtoFlux:Data Model Store|Data Model Store]] pages.