3D Texturing 3D Texturing 5

Question 1

What is 'tri-planar mapping' and when is it most useful?

Accepted Answer

A technique that blends three axis-aligned projections to texture a mesh without UV seams, useful for complex or procedural geometry

Answer

Tri-planar mapping blends textures projected along the X, Y, and Z world axes based on surface normals, eliminating UV seams on geometry like rocks, terrain, or procedurally generated meshes.

Question 2

In Marmoset Toolbag's baking system, what does 'skew correction' help resolve?

Accepted Answer

Corrects tangent-space normal map artifacts caused by skewed or non-uniform UV stretching

Answer

Skew correction in Marmoset adjusts the normal map bake to account for skewed UV islands, producing accurate tangent-space normals even where UVs are non-uniformly stretched.

Question 3

What does the 'Fresnel effect' govern in a PBR material, and how does it appear visually?

Accepted Answer

It describes how reflectivity increases at grazing angles, making surfaces appear more mirror-like near their silhouettes

Answer

The Fresnel effect (described by Schlick's approximation in PBR) causes nearly all materials to become highly reflective at grazing angles, which is physically accurate behavior.

Question 4

When should you use a 'smart material' in Substance Painter versus creating a material from scratch?

Accepted Answer

Use a smart material when you want a preset collection of generator-driven layers (edge wear, dirt, etc.) that adapt to the mesh's baked maps

Answer

Smart materials in Substance Painter are self-contained layer stacks with generators that reference baked maps (AO, curvature, position) to intelligently place dirt, wear, and other effects on the mesh.

Question 5

What is the key difference between 'hard edges' and 'smoothing groups' when preparing a mesh for normal map baking?

Accepted Answer

Hard edges and smoothing groups are different software representations of the same concept — edges where the shading normal transitions sharply

Answer

Hard edges (in Maya/Blender) and smoothing groups (in 3ds Max) are equivalent concepts — both define where surface normals are averaged continuously vs. split sharply, and both must align with UV seams for correct baking.

3D Texturing Practice Test

3D Texturing Practice Test

3D Texturing 3D Texturing 5