High-quality rendering of both audio and visual material properties is very important in interac- tive virtual environments, since convicingly rendered materials increase realism and the sense of immersion. We studied how the level of detail of auditory and visual stimuli interact in the per- ception of audio-visual material rendering quality. Our study is based on perception of material discrimination, when varying the levels of detail of modal synthesis for sound, and Bidirectional Re ectance Distribution Functions for graphics. We performed an experiment for two di erent models (a Dragon and a Bunny model) and two material types (Plastic and Gold). The results show a signi cant interaction between auditory and visual level of detail in the perception of material similarity, when comparing approximate levels of detail to a high-quality audio-visual reference rendering. We show how this result can contribute to signi cant savings in computation time in an interactive audio-visual rendering system. To our knowledge this is the rst study which shows interaction of audio and graphics representation in a material perception task.