I think you might need to use refraction-like cubemap sampling ? ShaderFX has a node and examples for that I think. I've never used it since refracting only a cubemap and not the objects behind 8(like glass) is totally useless, so I don't know the code off the top of my head, but could be what you want ?
Hiho guys i'm currently playing around alot with shaders and for a pretty specific effect i was searching for something that acts like an inverted cubemap. To make it clear, a cubemap acts like a reflections to show stuff that is around and therefore outside the object, what id love to do is using a map that acts as if…