The settings for the shader are the same as for the Deformer, except for the addition of the Foam checkbox.
Default value: off
With the foam checkbox enabled the shader will output 'foam' shading for one of the visual shading channels.
The various spectrum values can deliver 'softer' or 'sharper' foam patterns, with spectrum 3 being the sharpest. Manipulating wave height, chop, wave smooth, and surface tension can deliver a wide range of foam patterns. The useful value range of these parameters in visual shading is significantly wider than when used for deformation or displacement.
The shader can be used in a displacement channel to generate render-time displacement as an alternative - or addition to the deformer.
By default the shader is a 32bit / channel RGB object space displacement shader.