  Digital representations of the real world are being used in many
applications, such as augmented reality. 6G systems will not only support use
cases that rely on virtual worlds but also benefit from their rich contextual
information to improve performance and reduce communication overhead. This
paper focuses on the simulation of 6G systems that rely on a 3D representation
of the environment, as captured by cameras and other sensors. We present new
strategies for obtaining paired MIMO channels and multimodal data. We also
discuss trade-offs between speed and accuracy when generating channels via ray
tracing. We finally provide beam selection simulation results to assess the
proposed methodology.
