Parametric mapping, as I understand it, means mapping a texture to the UV map of an object. This is the only sort of mapping that Poser 4 understands, and Vue has it already or it wouldn't be able to texture Poser figures. However, it may be the case that you can't use parametric mapping in Vue on a Vue object like a cube, as opposed to an imported mesh. I have to say I find the texture mapping in Vue a bit confusing.