pub struct PickingRaycastSet;
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This unit struct is used to tag the generic ray casting types RayCastMesh and RayCastSource. This means that all Picking ray casts are of the same type. Consequently, any meshes or ray sources that are being used by the picking plugin can be used by other ray casting systems because they will have distinct types, e.g.: RayCastMesh<PickingRaycastSet> vs. RayCastMesh<MySuperCoolRaycastingType>, and as such wil not result in collisions.

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