Warp Configuration dialog

The "flow" of a warp is set by control points on a mesh.

First, set the color and size of the mesh. Use a color that is most visible on the image. A larger mesh will give you finer control over the warping action, but will take more time to configure as there are more points.

The modified grid will stretch and shrink the image. You will be able to preview the image as you move the control points.

Since setting up the mesh control points can take some time, you can save those settings and load them to use at a later time.

Be sure to move the Effect In/Out sliders in the main Effect windows to have the warp effect transform the image from the original state to the new look.