float ambientOcclusion()

in src/elm_src/Algorithm/fractals.c [556:570]

• 13 lines of code
• 2 McCabe index (conditional complexity)

float ambientOcclusion(vec3 p, vec3 n, float eps)
{
    float o = 1.0;                  // Start at full output colour intensity
    eps *= aoSpread;                // Spread diffuses the effect
    float k = aoIntensity / eps;    // Set intensity factor
    float d = 2.0 * eps;            // Start ray a little off the surface

    for (int i = 0; i < aoIterations; ++i) {
        o -= (d - dE(p + n * d).x) * k;
        d += eps;
        k *= 0.5;                   // AO contribution drops as we move further from the surface
    }

    return clamp(o, 0.0, 1.0);
}