Myinout blue stripe down middle myinout smoothstep

632 CHAPTER 18 Advanced Buffers

LISTING 18.10 Continued

// red star on yellow background
vec3 surfColor = mix(yellow, red, myInOut);

// blue stripe down middle
myInOut = smoothstep(0.0, smoothEdgeTol,
abs(NV.z) - stripeThickness); surfColor = mix(blue, surfColor, myInOut);

FIGURE 18.10	Making Your Whites Whiter and Your Brights Brighter	633
FIGURE 18.10	Our glowing toy ball after the first pass. The red tinted glow appears white	633

due to floating-point clamping because all color channels exceed 1.0.