Hi Nilson,
Thank you very much. That helps massively. After comparing my settings with one of the OceanProject map, i figured it out a bit. Currently PP_Global is set to unbounded and its PostProcess Materials Array value is set to nothing. Created PP_Underwater as a child to BP_Underwater, set PP_Underwater’s PostProcess Materials Array to instance 2, NOT set it to unbound, referred it in BP_Underwater. however the underwater color changed only when the character jumps into PP_Underwater’s scope LOL
i am new so still have a lot to figure out, such as 1 the snow falls through the surface into under water,
2 didn’t know why the OceanProject map’s PP_Underwater is so small and not set to unbounded but it makes on the whole underwater space
3 upon rotating sunlight, refreshing skydome, can see the nighttime scene, milky way, etc but when click on Play, it goes back to daytime.
Thanks again.