This is the manual for the old version of Rive (formerly Flare). Visit the Help Center for the new Rive here.
Clipping paths allow you to cut out one shape with another. This is sometimes called masking. To use one of your shapes as a clipping path for another shape, first select the shape you want to clip. In the Inspector, press the Clipping button and select the path you want to use as a clipping path, or mask. Rive can use any shape as a clipping path, regardless of where it is in the hierarchy.