Hmm. Takezo, I'm not sure what you plan to do with the fastscatter node, which I find all but useless. Nevertheless, I'm not sure I understand the problem about raytraced shadows.

You said "While in a real world situation Like say IBL on clear sunny day, this would prove impossible to capture any realism because this would involve clear cast shadows, and not diffuse soft shadows as required by the DEFAULT P6's FS feature"

In this render, I'm seeing almost no difference between the ray-traced version and the shadow mapped version. In fact, the shadow mapped version looks a little better to me in that it does not have the jaggies of the ray-traced shadows. Why do you think using shadow maps gives bad results for outdoor scenes? Perhaps you forgot to increase the shadow map size?

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)