Materials and Mapping
Material types and the Slate editor
3ds Max offers the Slate Material Editor (node-based) and the compact editor. Candidates should know the Physical Material and the legacy Standard material, plus the multi/sub-object material for assigning different materials per face or object ID. Key channels include diffuse/base color, roughness/glossiness, metalness, reflection, refraction, opacity, bump, and displacement. A trap: bump fakes surface detail via normals and does not alter silhouette, while displacement actually moves geometry.
Mapping coordinates
UVW coordinates map 2D textures onto 3D surfaces. The UVW Map modifier provides planar, cylindrical, spherical, box, and face mapping with gizmo control of tiling and alignment. Real-world map scale ties texture size to scene units. Unwrap UVW is the tool for custom layouts, seams, and packing. Questions often test the difference between mapping channel 1 and channel 2, and that procedural maps (Noise, Checker, Gradient) need no bitmap file.
Map types and outputs
Bitmap, Composite, Mix, and Color Correction maps are common. Output amount and RGB levels control intensity. The Material/Map Browser organizes by scene, material library, and map categories.
Worked example
A tiled floor: apply a Bitmap to the diffuse slot, add a UVW Map set to Box with real-world scale matching the tile size, then add a Bump map using the same bitmap. If tiles stretch on vertical faces, switch to Box mapping or adjust the gizmo.
Rule of thumb
Match the mapping projection to the object's dominant shape: planar for flat surfaces, cylindrical for tubes, box for architectural volumes, spherical for round objects.