This is the AOBench example associated with the "Intel® Cilk™ Plus – The Simplest Path to Parallelism" how-to article.  It shows an Ambient Occlusion algorithm implemented as serial loops, one using Intel Cilk Plus' cilk_for keyword to implement parallelism, one version using Intel Cilk Plus' array notations to allow vectorization for the SIMD instruction, and another version using both cilk_for and the array notations.  It demonstrates great performance with very little coding changes through both data-parallelism and task-parallelism.