
24515.4 Light Prepass
Figure 15.4
Gold metallic spheres illuminated by single punctual light source, and image-based lighting. Top row: vertical
split-screen comparison of Fresnel parameterized with nDotH, left, and nDotV, right. Bottom row: vertical split-
screen comparison of Fresnel parameterized with nDotH, left, and false nDotH, computed with hardcoded
upward facing light vector. NDotV exhibits a subtle overestimation of reectance, particularly visible at the rim
of the sphere, where nDotV approaches 1.0.
Figure 15.5
Direct light, evaluated in RGB space at 100% resolution.