3D Rendering Topics

Perspective-correct interpolation

PLERP

Texture

Problem: The texture’s pixels must be mapped to points on the object’s surface before the texture can be sampled

Interpolating triangle UVs

Texture space

RGB 0 -> XYZ -1

RGB 0.5 -> XYZ 0

RGB 1 -> XYZ 1

Normal maps

The physics of lighting

The physics of lighting

Flux

Irradiance

Lambert’s law

Shading Models

Shading models dictate how one interpolates the results of reflection models

Vertex shader, fragment shader

Gouraud Shading Model

Cons:

• Vertices with different colors

Phone Shading Model

Fragment

Reflection Models

• Blinn-Phong specular highlights
• Specular reflection model
• Subsurface Scattering
• Microfacet reflection