This is a clip file which produces a pattern of ripples similar to those created by POV-Rayís ripples normal pattern. The clip is based on the ripple functions I used here: http://forums.planetside.co.uk/index.php?topic=4524.0
For convenience the clip includes a water shader with the waves zeroed and the displacement shader that makes the ripples.
There is a Constant Scalar to the right of the Ripples Group which can be changed to change the size of the ripples. This also affects the height of the ripples to keep them proportional. The height can be changed independently with the Displacement Multiplier in the displacement shader.
The ripple pattern is built by averaging the sine of the distance from eight arbitrary points. The pattern of ripples can be changed by moving these points, which are defined by eight Constant Vectors in the Ripples Group.
The sample image shows the clip applied to a 1 metre radius lake placed 10 metres above the default terrain.