Material families

Group materials by shared light behavior so you can establish their rendering patterns before adding surface detail.

What it is

Material families group objects by how light behaves on them, such as metal, fabric, glass, and wood. Each family has typical highlight sharpness, shadow depth, and reflectivity.

Choose an object's family before rendering it. Metals use structured reflections, fabrics soften highlights into bands, and glass and other refractive materials distort what lies behind them. Skin combines soft sheen with subsurface scattering, where light travels just under the surface.

Establish the shared light behavior with simple shapes and lighting, then add texture detail and weathering. This approach also keeps related materials consistent across a scene.

Why it matters

Material families help you render different objects with consistent light behavior. Weak control can make metal resemble plastic, fabric resemble chrome, or stone resemble rubber, causing materials in the same scene to feel unrelated.

You can check it when

• ✓Name the material family of each object in your work, such as metal, synthetic, refractive, masonry, wood, fabric or leather, fibers, or organics, and explain the highlight and shadow choices.
• ✓Complete a grayscale study of a mixed still life with metal, glass, fabric, wood, and skin. The materials should read with minimal texture detail.
• ✓Check whether each family follows consistent rules across a scene, including reflection structure for metals, highlight softness for fabrics, and subsurface depth for organics.
• ✓Render one object as a different material family, such as a stone statue changed to polished wood or metal, and verify that its light behavior supports the new family.

Sub-skills

• Metals (raw, painted, chrome, gold/brass/copper)
• Synthetics (plastic, rubber)
• Refractives (glass, water, ice)
• Masonry (stone, concrete, brick)
• Wood (raw, painted)
• Fabrics and leather (cloth, satin/silk, denim, leather)
• Fibers (fur, hair)
• Organics (skin, bone, horn, flesh)

Related skills

• Differentiating materials through value, edges, reflections, and texture
• Weathering (rust, dirt, dust, scratches)
• Texture versus material
• Edges as a tool (indicating depth, material, and controlling attention)
• PBR channels (base color, roughness, metallic, normal/bump, transparency, emission)
• Source size → hard vs. soft light