  We present a full 360 degree (i.e., 4$\pi$ steradian) general-relativistic
ray-tracing and radiative transfer calculations of accreting supermassive black
holes. We perform state-of-the-art three-dimensional general relativistic
magnetohydrodynamical simulations using the BHAC code, subsequently
post-processing this data with the radiative transfer code RAPTOR. All
relativistic and general-relativistic effects, such as Doppler boosting and
gravitational redshift, as well as geometrical effects due to the local
gravitational field and the observer's changing position and state of motion,
are therefore calculated self-consistently. Synthetic images at four
astronomically-relevant observing frequencies are generated from the
perspective of an observer with a full 360-degree view inside the accretion
flow, who is advected with the flow as it evolves. As an example, we calculated
images based on recent best-fit models of observations of Sagittarius A*. These
images are combined to generate a complete 360-degree Virtual Reality movie of
the surrounding environment of the black hole and its event horizon. Our
approach also enables the calculation of the local luminosity received at a
given fluid element in the accretion flow, providing important applications in,
e.g., radiation feedback calculations onto black hole accretion flows. In
addition to scientific applications, the 360-degree Virtual Reality movies we
present also represent a new medium through which to communicate black hole
physics to a wider audience, serving as a powerful educational tool.
