Materials and Shading in Blender

The Principled BSDF

Blender's main material node covers most real surfaces: base colour, metallic, roughness, IOR, transmission (glass), subsurface (skin, wax), coat, sheen (fabric) and emission.

Shader nodes

In the Shading workspace, combine nodes to build materials:

Texture Coordinate → Mapping → Noise Texture → Color Ramp → Principled BSDF (Base Color)
                                         └──────────→ Bump → (Normal)

This creates a procedural, mottled surface with matching bumpiness, with no image textures or UVs needed.

Image textures

Add Image Texture nodes for base colour, roughness and normal maps. Set non-colour maps (roughness, normal, metallic) to Non-Color colour space; using sRGB for them gives wrong results.

Variation adds realism

Real surfaces are never perfectly uniform. Add subtle roughness variation, edge wear (using pointiness or ambient occlusion masks) and slight colour noise.

Reuse

Save materials in an asset library (mark as asset) so you can drag them into any project.

Exercise

Create four procedural materials (glazed ceramic, brushed metal, frosted glass and worn painted wood) using only nodes, and render them on spheres with an HDRI for a material sheet.

Check yourself

• Which colour space should a roughness map use?
• What does the transmission setting create?
• Why add subtle variation to materials?