fade filter

Hi, how to use a fade filter for just trigger player?

I wanna make a fade filter that enter and then exit (I don't know if this is how is writen in English) but that last what I wanna, basically I wanna that end only if a condition is true, I tried to use a fade filter that enter and in the end other that exit, but this last only repeats itself, I...

Does anybody know what are the limitations of the game showing fade filters properly? There are only couple old tutorials here and there talking about blp file has to be converted 512x512 tga but 1024x1024 managed to work for me which obviously still looks like crap. Any ideas how to get it to...