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Custom Distance Grab Visuals
Updated: Mar 14, 2025
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 > InterationSDK > Grabber > InterationSDK > 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 | Description |
|---|---|
User.GrabLocation | The location of the pointer pose |
User.GrabVector | The direction the pointer pose is pointing |
User.GrabTargetLocation | The location of the transform target of the grabbable |
User.GrabTargetVector | A vector representing the direction User.GrabTargetLocation to User.GrabLocation |
User.GrabbableLocation | The location of the grabbable detecting the distance grab |
User.GrabbableVector | A vector representing the direction User.GrabbableLocation to User.GrabLocation |
User.IsGrabbing | True if the user is currently grabbing |
User.IsGrabTargetValid | True if the grab target is a non-null value (grabbables don’t necessarily have a valid grab target) |
User.PinchStrength | A 0-1 value indicating the strength of the user’s pinch |
User.IsPinching | True if the user is grabbing with a pinch grab |
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