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Custom Distance Grab Visuals
Updated: Apr 15, 2026
Interaction SDK includes default visuals for distance grab interactions in the form of a targeting beam driven by a Niagara particle system.
If you want to use a custom visual cue for distance grab interactions in your project, you can create your own Niagara particle system and set it to be used instead.
Specifying the Niagara System to Use
The Niagara particle system to use for distance grab visual cues is specified in the Distance Grab Niagara System property (Grab Interaction > InteractionSDK > Grabber > InteractionSDK > Distance Grab Niagara System) on each of the rig components in the Pawn:
IsdkHandRigComponentLeft, IsdkControllerRigComponentLeft, IsdkHandRigComponentRight, IsdkControllerRigComponentRight.User Properties Passed to Niagara
The following user parameters will be passed into the Niagara system each frame, enabling you to create an effect that is tailored to the interaction.
| Parameter | Type | Description |
|---|---|---|
User.GrabLocation | FVector | The location of the pointer pose |
User.GrabVector | FVector | The direction the pointer pose is pointing |
User.GrabTargetLocation | FVector | The location of the transform target of the grabbable |
User.GrabTargetVector | FVector | A normalized vector representing the direction from User.GrabLocation to User.GrabTargetLocation |
User.GrabbableLocation | FVector | The location of the grabbable detecting the distance grab |
User.GrabbableVector | FVector | A normalized vector representing the direction from User.GrabLocation to User.GrabbableLocation |
User.IsGrabbing | bool | True if the user is currently grabbing |
User.IsGrabTargetValid | bool | True if the grab target is a non-null value (grabbables don’t necessarily have a valid grab target) |
User.PinchStrength | float | A 0-1 value indicating the strength of the user’s pinch |
User.IsPinching | bool | True if the user is grabbing with a pinch grab |
Learn more
To learn more about distance grab interactions and related features, see the following guides:
Design guidelines
Design guidelines are Meta’s human interface standards and design frameworks that help you create safe, user-oriented, and retainable immersive and passthrough user experiences.
Hands
- Hands design: Design best practices for using hands in your app.
- Hands technology: Understand the technology behind hands.
- Hands best practices: Best practices, limitations and mitigations for using hands.
- Hands examples: Hands interaction examples.
- Hands quickstart prototype: Get started quickly with a hands prototype.
- Hand representation: Understand hand representation.
Core interactions
- Input mappings: Understand how input mappings bridge modalities and interaction types.
- Input hierarchy: Understand the input hierarchy.
- Multimodality: Understand multimodality.
- Ray casting: Understand indirect interaction through ray casting.
- Touch: Understand direct interaction through touch.
- Grab: Understand grab interactions for object manipulation.
- Microgestures: Understand microgesture interactions.
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