Special Nodes
The "Special" category contains nodes for custom variables, custom events, flow control, and communicating with other UdonBehaviours.
Block
Splits flow into multiple sections. One flow input, multiple flow output. Executes all right-side flow slots from top to bottom.
Branch
Inputs: Bool - System.Boolean
Branches execution based on a conditional evaluation. If Bool is True, True flow path is executed. If Bool is False, False flow path is executed.
Comment
Provides a space for the user to type a comment string. This string is not included during compilation.
Const Null
Provides a "null" value for nullchecking purposes.
Const This
Provides a reference to the GameObject that the UdonBehavior is a component of.
Event Custom
Inputs: name - System.String
A a custom event that can be executed by UdonBehaviour nodes.
You must name the custom event by typing its name in the Graph. The event name cannot be changed while your program is running.
For
Inputs: start, end, step - System.Int32
Outputs: index - System.Int32
Executes flow by using a counter. A counter is initalized with the value of start. The Body flow is executed, and then the counter is incremented by the step value. This continues until the counter's value is equal or greater than end. Once that has occured, flow continues along on the Exit flow.
Get Variable
Inputs: name - System.String
Outputs: System.Object
Gets the Udon variable named name and provides it as output.
Set Variable
Inputs: name - System.String value - System.Object sendChange - Boolean
Sets the Udon variable named name to value when flow is executed. If sendChange is checked, it will also trigger the OnVariableChanged event for that variable.
Get Program Variable
Inputs: instance - UdonBehaviour symbolName - string
Get the value of an Udon variable symbolName from another UdonBehaviour instance. Works best if the target UdonBehaviour is a public variable and it's wired up in the Inspector, which allows you to choose the target variable name from a dropdown. If there's no UdonBehaviour connected to instance, it will use the current UdonBehaviour's variable names. If you instead know the name of the variable and want to set it directly, use a String const node to write it in by hand.
Set Program Variable
Inputs: instance - UdonBehaviour symbolName - string value - Object
Sets the value of an Udon variable symbolName on another UdonBehaviour instance to value. Works best if the target UdonBehaviour is a public variable and it's wired up in the Inspector, which allows you to choose the target variable name from a dropdown. If there's no UdonBehaviour connected to instance, it will use the current UdonBehaviour's variable names. If you instead know the name of the variable and want to set it directly, use a String const node to write it in by hand. This node will also trigger the OnVariableChanged event for the target variable.
On Variable Changed
Outputs: newValue oldValue
Triggers whenever SetProgramVariable is called on the target variable, or when Set Variable is called with sendChange checked. Works for synced variables, too!
While
Inputs: Bool - System.Boolean
Executes the flow of Body while Bool is true. If Bool is false, executes Exit flow.
UdonBehaviour Nodes
Udonbehaviour nodes allow your programs to interact with other UdonBehaviours - either locally, with a delay, or over the network.
The nodes below only work for public events. If you use the Udon Graph, your custom events are always public. If you use UdonSharp, make sure to use public instead of private events here!
SendCustomEvent
Inputs: instance - UdonBehaviour, eventName - String
Runs the event 'eventName' on the target UdonBehaviour. If instance is left blank, it points to one of its own events.
SendCustomEventDelayedFrames
Inputs: instance - UdonBehaviour, eventName - String, delayFrames - int, eventTiming - EventTiming
Runs the event eventName on the target UdonBehaviour, after waiting for delayFrames. It will run the event during Update, LateUpdate, FixedUpdate or PostLateUpdate, depending on which eventTiming is selected. Minimum of 1 frame delay.
Note that Unity's frame count is based on the Update event. If you call SendCustomEventDelayedFrames before the Update event, such as Start or an Input event, the delay may be 1 frame shorter than expected.
SendCustomEventDelayedSeconds
Inputs: instance - UdonBehaviour, eventName - String, delaySeconds - float, eventTiming - EventTiming
Runs the event 'eventName' on the target UdonBehaviour, after waiting for delaySeconds. It will run the event during Update, LateUpdate, FixedUpdate or PostLateUpdate, depending on which eventTiming is selected.
If delaySeconds is zero, the event will be executed in the same frame or the next frame (see SendCustomEventDelayedFrames above).
SendCustomNetworkEvent
Inputs: instance - UdonBehaviour, target - NetworkEventTarget, eventName - String
Runs the event eventName on the target UdonBehaviour for remote players according to target. Has overloads for including parameters.
Check the page on Network Events for more details.