  Rapid advances in technology gradually realize immersive mixed-reality (MR)
telepresence between distant spaces. This paper presents a novel visual
guidance system for avatar-mediated telepresence, directing users to optimal
placements that facilitate the clear transfer of gaze and pointing contexts
through remote avatars in dissimilar spaces, where the spatial relationship
between the remote avatar and the interaction targets may differ from that of
the local user. Representing the spatial relationship between the user/avatar
and interaction targets with angle-based interaction features, we assign
recommendation scores of sampled local placements as their maximum feature
similarity with remote placements. These scores are visualized as color-coded
2D sectors to inform the users of better placements for interaction with
selected targets. In addition, virtual objects of the remote space are
overlapped with the local space for the user to better understand the
recommendations. We examine whether the proposed score measure agrees with the
actual user perception of the partner's interaction context and find a score
threshold for recommendation through user experiments in virtual reality (VR).
A subsequent user study in VR investigates the effectiveness and perceptual
overload of different combinations of visualizations. Finally, we conduct a
user study in an MR telepresence scenario to evaluate the effectiveness of our
method in real-world applications.
