3D Texturing 3D Texturing Materials & Surface Properties

Question 1

In a PBR metallic-roughness workflow, what does a metallic value of 1.0 indicate?

Accepted Answer

The surface is a pure metal and reflects light according to Fresnel equations

Answer

A metallic value of 1.0 tells the PBR shader to treat the surface as a conductor, using the albedo as the reflective tint rather than diffuse color.

Question 2

What does a roughness value of 0.0 produce on a PBR surface?

Accepted Answer

A perfectly mirror-like, sharp specular reflection

Answer

A roughness of 0.0 creates a perfectly smooth microsurface, resulting in sharp, mirror-like specular reflections.

Question 3

What is the purpose of an Ambient Occlusion (AO) map in a PBR material?

Accepted Answer

To add soft shadowing in crevices and contact areas that simulates indirect light occlusion

Answer

AO maps store pre-computed soft shadows in concave areas, adding depth and grounding to a PBR material under any lighting.

Question 4

What is Subsurface Scattering (SSS) used for in 3D materials?

Accepted Answer

Simulating light that penetrates and scatters beneath the surface of translucent materials like skin or wax

Answer

SSS simulates how light enters a surface, scatters internally, and exits at a different point, which is essential for realistic skin and candles.

Question 5

In PBR materials, what is the F0 (Fresnel zero) value used to define?

Accepted Answer

The base specular reflectivity of a non-metallic surface at a 0-degree viewing angle

Answer

F0 defines how reflective a dielectric (non-metal) surface is when viewed straight-on, typically around 0.04 for most non-metals.

3D Texturing Practice Test