It can be useful for the avatar's hands to interact physically with the world e.g. hand not going through the wall, instead of the hand matching the controller position and going through everything. The physical hands feature of the SDK enables this physical behaviour on the hands.

XR Controller Physics

The XRControllerPhysics component should be placed on the tracked part of the hand and sets the visual part of the hand's position depending on how it is set up. When IsPhysical is set to true the visual part of the hand will react as part of Unity's physics system according to the Physics Settings set on the component.

Toggle Physical State

The physical state of the hands can be toggled at runtime in code by getting a reference to XRControllerPhysics and setting IsPhysical to true.

public void TogglePhysicalHand(XRControllerPhysics xrControllerPhysics)
{
    xrControllerPhysics.IsPhysical = true;
}