An illustrative audiovisual content rendering system generates a light dataset configured to model light energy at a particular location within a simulated 3D environment for a video frame time. The audiovisual content rendering system also generates an audio dataset configured to model acoustic energy at the particular location within the simulated 3D environment for an audio frame time concurrent with the video frame time. The audiovisual content rendering system stores the light dataset and the audio dataset together within a voxel-based data structure. More particularly, the light dataset and the audio dataset are stored together within a particular voxel of the voxel-based data structure that corresponds to the particular location within the simulated 3D environment. Corresponding methods and systems are also disclosed.