Variable Selection

The Branch on Boolean node provides flexible variable selection through the Details Panel. You can change which boolean variable the node uses at any time, and the node automatically detects all available boolean variables in your Blueprint.

Variable Selection

Changing the Variable

Select the Node

Click on the Branch on Boolean node in your Blueprint graph.

Open the Details Panel If not already visible, open the Details Panel via

Window → Details or press F4.

Name** dropdown under the Variable category.

variables. Select the one you want to use.

Verify the Change

The node title updates to reflect the new variable (e.g., "Branch on bNewVariable").

Supported Variable Types

The node's variable dropdown automatically detects and lists all boolean variables available in the current context:

Member Variables

Boolean variables defined directly on the Blueprint class.

MyCharacter Blueprint
├── bIsAlive ✓
├── bCanJump ✓
├── Health (Float) ✗
└── Name (String) ✗

Only boolean (bool) variables appear in the dropdown.

Local Variables

Boolean variables defined within the current function or event graph.

Local variables are only visible when the Branch on Boolean node is placed inside the function where they're defined.

Inherited Variables

Boolean variables inherited from parent classes (both Blueprint and C++ parents).

Parent: ACharacter (C++)
├── bCanEverTick ✓
├── bInputEnabled ✓
└── bBlockInput ✓

Parent: BP_BaseCharacter (Blueprint)
├── bIsInCombat ✓
└── bHasWeapon ✓

All BlueprintVisible boolean properties from parent classes are included.

Automatic Rename Tracking

One of the key features of Branch on Boolean is automatic rename tracking:

Rename a Variable

In the Variables panel, rename your boolean variable (e.g., bIsAlive → bIsActive).

Node Updates Automatically

All Branch on Boolean nodes using that variable will automatically update their titles to reflect the new name.

This works because the node stores the variable's internal GUID, not just its name. When the Blueprint compiles, the node looks up the current name for that GUID.

Variable Not Appearing?

If a boolean variable doesn't appear in the dropdown, check the following:

Issue	Solution
Variable is not boolean type	Only `bool` variables are listed. Check the variable type.
Variable is private	Ensure the variable has `BlueprintReadOnly` or `BlueprintReadWrite` access.
Variable is deprecated	Deprecated properties (marked with `Deprecated` metadata) are excluded.
Variable is in another function	Local variables only appear in their defining function's scope.
Blueprint not compiled	Compile your Blueprint to refresh the variable list.

Working with Multiple Nodes

When you have multiple Branch on Boolean nodes using the same variable:

All nodes update together when you rename the variable
Each node is independent - changing one node's variable doesn't affect others
Validation happens at compile time - if a variable is deleted, affected nodes will show errors

Best Practices

Use Descriptive Names

Since the variable name is prominently displayed in the node title, use clear, descriptive names:

Good	Avoid
`bPlayerAlive`	`bFlag1`
`bCanDoubleJump`	`bTemp`
`bTutorialCompleted`	`bDone`

Prefix with 'b'

Follow Unreal Engine's naming convention by prefixing boolean variables with b:

bIsEnabled
bShouldUpdate
bHasBeenTriggered

Next Steps

Node Reference - Complete technical reference for the node
Troubleshooting - Common issues and solutions

Variable Selection

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