MARBLE: Diffuse key with soft fill, ratio 2:1, warmer CCT (2700-3000K) to enhance warmth, some transmitted light possible for thin sections. BRONZE: Harder key at raking angle to reveal patina and texture, fill at 3:1 to 4:1 ratio, cooler CCT (3500K) to avoid warmth competing with material's natural color. WOOD: Raking light to show grain, warm CCT (2700K) to complement, moderate ratio 2:1 to 3:1. GLASS: Multiple sources from various angles to create internal reflections, background lighting to create silhouette. MIXED MEDIA: Compromise based on dominant material or zone lighting.