---
title: Source Info
product: Advanced Framework Pro
version: 1.0
engine: Unreal Engine 5.8
updated: 2026-10-05
canonical: https://docs.human-codeable.com/concepts/source-info.html
---

# Source Info

How the framework keeps interactable objects independent of the player.

![The Source Info struct and where it originates](../images/diagram_sourceinfo.svg?v=afc65768)

The Source Info struct and where it originates

## The problem it solves

If a grabbable object asks "which hand grabbed me?", it has to know about hands — and then it only works in VR. If it asks "who selected me?" and the answer is a pawn class, it only works with that pawn.

## The struct

`ST_SourceInfo` carries three things: the **pawn** that acted, the **component** that acted, and the component's **identifier** name. It is produced by `BPI_SourceInfo.getSourceInfo`, which all three ability base classes implement.

Every interaction call takes it as a parameter. A target therefore knows exactly who acted on it, with enough detail to distinguish left hand from right, without ever referencing a pawn or controller class.

## Using it

- `FL_Haptics.Haptics_Effect` takes Source Info and plays on the correct hand automatically.
- `getSidesFromAbility` resolves Source Info to one hand or both.
- The identifier lets you distinguish, for example, a fingertip overlap from a whole-hand overlap using `Allowed Identifiers` on `BPC_Interaction_Overlap`.

Tip

When you write your own interaction, take Source Info as a parameter even if you do not need it yet. It costs nothing and it is the difference between an interaction that works on one platform and one that works on all three.