I am working with Vickie 4. Ideally I am trying to use her in a scene as an alien. In the scene I am making I am trying to open her mouth very, very wide--large enough to swallow another human whole. She is planned to be a pretty evil alien, except I have no idea how to make her mouth open to that extent. I'm not even sure if its possible. I'd imagine with deformers or something, turning limits off, but not sure if its workable.

 

Any advice? 

Remember that her mouth open morphs are just that - Morphs. We naturally want to treat those as being rigged, but they're just morphs and they'll deform pretty horribly if you try to exceed the limits. (Note: The Lower Jaw is rigged, sorry. But, I think it works in close association with JCM's in open/close. I don't think it has deformers, itself. It just provides a base for the tongue rigging and an anchor for the separate Lower Jaw group.)

The easiest way would be to use magnets and the Morph Tool to smooth up the edges. Don't forget to include the Lower Jaw group and all the Tongue groups, as well, when selecting groups to be deformed by your magnets. (The tongue is rigged. Go figure.... Gee, why did they do that? :) ) In later versions of Poser, the Morph Tool spans groups, so using it is a lot easier than it used to be. (Not sure when they incorporated that feature.)

Texture stretching will happen. But, it probably won't be too much of an issue, since you're already going to morph her mouth into something that's probably pretty grotesque to begin with.

Unless you're stretching this to ludicrous levels, you probably won't need to make a custom morph in an external 3D application. Poser's Morph Tool should be enough to smooth it up nicely.

PS - Don't forget about the Neck group in your deformation. V4's neck will probably need to follow the deformation closely, as well, if it's very severe.