EntityFX 16 makes the polygons of an entity 2 sided (ie. you can see the polygon from both sides.) You really shouldn't ever use it because collision detection and lighting don't work on the backs of polygons. Instead, model another polygon, positioned in the same place but facing the opposite direction.
EntityFX 32 doesn't apply to alpha transparency using alpha channels in textures or using EntityAlpha. I think it only matters for vertex alpha. Is that what you mean by "transparency of the triangle?"
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