set<box> box::sample_points(unsigned const n) const {
set<box> points;
for (unsigned i = 0; i < n; i++) {
points.insert(sample_point());
}
return points;
}
Color Light::Sample(Point const& point, Ray *out_ray, int row, int col) const {
Point sample_point(0.0, 0.0, 0.0);
double cell_width = 1.0 / cols;
double cell_height = 1.0 / rows;
if (area) {
double offx = rand_double(-0.25, 0.25) / cols;
double offy = rand_double(-0.25, 0.25) / rows;
double x = (col * cell_width + offx) - 0.5;
double y = (row * cell_height + offy) - 0.5;
sample_point = Point(x, 0.0, y);
}
sample_point = transformation.Apply(sample_point);
if (out_ray) {
*out_ray = Ray(point, Normalized(sample_point - point));
(*out_ray).max_dist = Norm(sample_point - point);
}
// In future, this may be deferred to a subclass for e.g. multicolored lights
return color;
}