Off topic from the Ortho camera, but related to the SingleLayerWater issue you bring up:
I noticed that I do not get shadows on SingleLayerWater shadow when using raytraced shadows. Is it safe to assume that raytraced shadows do not work on the surface of single layer water shader?
Im working on an ocean / sea scene that is using this shading model as part of its base water shader, but noticed RT Shadows not working at all with this model and cascade shadow maps leave a lot to be desired.