string

string

Less (float) — A < B

Cross Product — cross product of two Vectors

Two Blueprints reference each other in a way that can't compile

Why: '{a}' includes '{b}' as a hard reference, AND '{b}' includes '{a}' as a hard reference. UE5 can't compile either one first without the other already being compiled. Fix: Break the cycle by making ONE side use a SOFT reference (TSoftObjectPtr). Pick the side that doesn't need {b} immediately at construction — change the variable type to 'Soft Object Reference' instead of 'Object Reference'. Use Load Asset to resolve it at runtime.

Overlap

Two collision shapes occupying the same space without blocking. Use for triggers (volume, pickup).

Pickup and collectible system with overlap trigger

Pattern: Pickup actor with SphereCollision(overlap), StaticMesh visual. OnComponentBeginOverlap → CastTo PlayerCharacter → Success: call AddScore/AddItem interface on player → PlaySoundAtLocation → SpawnEmitterAtLocation → DestroyActor(self). Set collision to OverlapOnlyPawn for performance.

Set (Collection)

An unordered collection with unique elements. (The Set node for writing variables is a separate concept — see the entry for 'Set'.)

Multiply

Standard multiplication. UE 5.5+ defaults to Multiply_Double; older code may use Multiply_Float — both work in Blueprints.

Variable names in connections must match exactly (case-sensitive)

When connecting GetVariable or SetVariable nodes, the pin name must exactly match the variable_name field. E.g. variable 'MyHealth' → pin name 'MyHealth'. SetVariable exec input pin is always 'execute', not 'Execute' or 'in'. GetVariable has no exec pins — it is a pure data node.

Square — return A squared (A*A)