In this tutorial, you'll learn how to add water and use Caustics to create the beautiful patterns of light on the pool floor. For caustics to work, the water must have a rippled - not completely flat - surface. To achieve this, you'll use a Displacer modifier. You'll explore the Caustics settings. And you'll use Physical Render to get a better result. Now for the most fun part: you'll render out your caustics animation and hopefully marvel at the dancing patterns of light!