Weathering (rust, dirt, dust, scratches)

Place rust, dirt, dust, and scratches according to an object's form, material, lighting, and use.

What it is

Weathering describes use and exposure through surface changes. Rust appears on damp or chipped steel, grime collects in creases, dust settles on horizontal planes, and scratches mark glossy surfaces.

Place each effect according to the object's form and history. Scratches follow handling or movement, rust gathers near seams and bolts, and grime sits in areas with little light. Paint weathering as value and color shapes.

Keep the base material and lighting readable. Scratches curve with the surface, dust and grime wrap around volumes, and highlights still follow the material beneath the wear.

Why it matters

Controlled weathering helps objects show use, exposure, and replacement while retaining their form and material. Random or excessive marks can flatten surfaces, weaken material cues, and compete with the lighting.

You can check it when

• ✓You can explain why each rust patch, dirt streak, dust area, and scratch appears where it does.
• ✓Weathering follows the form and lighting: dust and grime wrap around volumes, edge wear sits on exposed ridges, and scratches follow perspective and surface curvature.
• ✓At a smaller viewing size, the weathering supports the main read without becoming visual noise or making surfaces look uniformly gray.
• ✓A used version of the object shows age while retaining the material identity of the new version.

Related skills

• Differentiating materials through value, edges, reflections, and texture
• Organic and manufactured texture — avoiding procedural-looking repetition
• Avoiding uniformly sharp rendering
• Bounce/reflected light and ambient occlusion
• Environmental storytelling (signs of habitation, age, damage)
• Surface story (materials, wear and history, cultural language)