  Human motion prediction is important for virtual reality (VR) applications,
e.g., for realistic avatar animation. Existing methods have synthesised body
motion only from observed past motion, despite the fact that human gaze is
known to correlate strongly with body movements and is readily available in
recent VR headsets. We present GazeMoDiff -- a novel gaze-guided denoising
diffusion model to generate stochastic human motions. Our method first uses a
graph attention network to learn the spatio-temporal correlations between eye
gaze and human movements and to fuse them into cross-modal gaze-motion
features. These cross-modal features are injected into a noise prediction
network via a cross-attention mechanism and progressively denoised to generate
realistic human full-body motions. Experimental results on the MoGaze and GIMO
datasets demonstrate that our method outperforms the state-of-the-art methods
by a large margin in terms of average displacement error (15.03% on MoGaze and
9.20% on GIMO). We further conducted an online user study to compare our method
with state-of-the-art methods and the responses from 23 participants validate
that the motions generated by our method are more realistic than those from
other methods. Taken together, our work makes a first important step towards
gaze-guided stochastic human motion prediction and guides future work on this
important topic in VR research.
