category_page.tex

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\begin{lstlisting}[language=C]
dvec3 sample(dvec3& src, dvec3& dir) {
  if (d > MAXDEPTH) return dvec3(0,0,0);
  isect is;
  trace(src, dir, is);
  if (is.dist == 1e10) return is.color;
  // intersection coord
  dvec3 intersect = dvec3(src + dir * is.dist),        
        r         = dvec3(dir + is.ref);
  if (is.mat == DIFFUSE) {
    dvec3 obj_color = is.color;
    dvec3 obj_ref   = is.ref;
    dvec3 c(0,0,0);
    for (sphere light : lights) {
      double lx = light.p.x + SOFT_SHADOWS,
             ly = light.p.y,
             lz = light.p.z + SOFT_SHADOWS;
      // direction to light
      dvec3 lightdir = norm(dvec3(lx, ly, lz));
      dvec3 lc = obj_color;
      // lambertian factor
      double b = dot(lightdir, obj_ref);
      if (b < 0) continue;
      lc *= pow(b, 3);
      // apply light color
      trace(intersect, lightdir, is);
      lc *= is.light;
      c += lc;
    }
    return clamp(c, 0.0, 1.0);
  } else if (is.light != dvec3(0,0,0)) {
    return is.light;
  } else if (is.mat == REFLECTIVE) {
\end{lstlisting}
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