3D Texturing 3D Texturing 2 — Questions and Answers
Question 1: What does the term 'texel density' refer to in 3D texturing?
- The number of texture layers on a mesh
- The ratio of texture pixels to surface area in world space (Correct answer)
- The maximum texture resolution supported by a GPU
- The number of UV islands on a UV map
Correct answer: The ratio of texture pixels to surface area in world space
Texel density describes how many texture pixels cover a given unit of real-world surface area, ensuring consistent detail across assets.
Question 2: Which blending mode in a PBR workflow allows you to combine two normal maps so both details are preserved?
- Overlay
- Multiply
- Reoriented Normal Mapping (RNM) (Correct answer)
- Screen
Correct answer: Reoriented Normal Mapping (RNM)
Reoriented Normal Mapping (RNM) correctly combines two normal maps by reorienting one relative to the other, preserving both sets of surface details.
Question 3: In Substance Painter, what is the purpose of a 'Fill Layer'?
- To bake ambient occlusion onto the mesh
- To project a texture from a camera view
- To apply a uniform color or texture value across the entire channel (Correct answer)
- To flood-fill a UV island with a solid color
Correct answer: To apply a uniform color or texture value across the entire channel
A Fill Layer in Substance Painter applies a constant color, value, or texture uniformly to one or more material channels across the whole mesh.
Question 4: What artifact appears on a texture when mipmapping is disabled and the camera views a surface at a steep angle?
- Bloom
- Aliasing / moiré pattern (Correct answer)
- Chromatic aberration
- Parallax distortion
Correct answer: Aliasing / moiré pattern
Without mipmapping, high-frequency texture detail at oblique angles causes aliasing and moiré patterns because many texels map to few screen pixels.
Question 5: Which channel in a PBR metallic-roughness workflow stores how mirror-like a surface is?
- Ambient Occlusion
- Metallic
- Roughness (Correct answer)
- Emissive
Correct answer: Roughness
The Roughness channel controls the microsurface scattering of light; a value of 0 produces a mirror finish while 1 produces a fully diffuse surface.
Question 6: What is 'seam reduction' or 'seam hiding' in UV mapping?
- Welding all UV edges together
- Placing UV seams in areas of low visual prominence on the model (Correct answer)
- Removing UV seams entirely by using UDIM tiles
- Scaling UV islands to minimize texture memory
Correct answer: Placing UV seams in areas of low visual prominence on the model
Seam hiding involves placing UV seams along edges that are naturally hidden, like underside creases or areas covered by other geometry, to minimize visible texture discontinuities.
Question 7: In a height-map texture, what does a middle-grey (0.5) value typically represent?
- Maximum surface displacement
- A hole or cavity in the surface
- The base level with no displacement (Correct answer)
- Transparent surface area
Correct answer: The base level with no displacement
In a height map, 0.5 (mid-grey) is the neutral baseline, with values above 0.5 raising the surface and values below 0.5 lowering it.
3D Texturing 3D Texturing 2
What does the term 'texel density' refer to in 3D texturing?