Hi
we have a plugin near ready for this effect, it doesnt use OSL (s o doesn tneed to wait until tOSL gets workign in coorna),it is parallax via native c4d sdk code(c++)-which has some advantages in speed
in a few weeks it wil be released i think.
it runs natively in corona render on flat and even curvaed surfaces.
i post it in forum once ready
best
Stefan