Ray gen loop (Vertex)

ray_gen_loop_vertex.cpp

    using Vec = light::Vector;

    unsigned k = 0;
    for (unsigned r = startRow; r < endRow; ++r) {
      for (unsigned c = startCol; c < endCol; ++c) {
        const Vec cam = light::pixelToRay(c, r, imageWidth, imageHeight);
        rays[k]     = cam.x + (float)(*antiAliasScale * rng());
        rays[k + 1] = cam.y + (float)(*antiAliasScale * rng());
        k += 2;
      }
    }