OK; I did a little more work dumping SH5 shaders and filters into SH4. After trial and error, you can get a working environment setup with SH5 shaders but personally I don't like the look. The reflected sunlight and object surfaces have a blue tint that doesn't look very good. I know how to alter this coloration, but the end result is an environment that doesn't look as good as the existing environmental mods for SH4.
Furthermore, the lack of sea foam at low windspeeds seems to be hardcoded for SH4. Again, this keeps SH5 files from looking good in the SH4 engine. To summarize, it all seems to be more trouble than it's worth; I would recommend continuing to develop the existing SH4 environmental mods (and of course getting permission from the creators if you want to release something).
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