What is the difference between roughness 3D model and Smart Materials 3D model?

Roughness 3D models define static surface texture (how light scatters for matte/shiny looks), while Smart Materials 3D models are dynamic, adapting appearance to context (lighting, angle, interaction). Roughness is a fixed, basic property—ideal for static textures like wood or metal. Smart Materials are programmable: they shift color, glow, or change texture (e.g., a game character’s armor reacting to damage). Use roughness for static objects (furniture, statues); Smart Materials for interactive designs (sci-fi props, game assets) to add adaptive depth.