Mouth... oops!

Today I tried focusing on how to combine primitives. I don't believe I've mentioned about primitives before, but a primitive is a shape composed of a list of points and a list of curves that may or may not be closed. Right now I have a primitive for the shape of the mouth, the head, and the shape of the muzzle.

I've loaded all three of these into a test application and did some complicated math stuff to combine both the mouth primitive and the muzzle primitive into one shape (after modifying them as needed). It was way trickier than I had expected - it isn't user-friendly in the slightest. Not to mention, I now have another problem to deal with - how to fix this terrible looking outline.

This combination technique needs a lot of work. I suspect the easiest thing to do is to use a skew transformations to simplify some of the stuff I did to create this mouth moving effect. After that, I'll need to find a way to fix the outline, probably doing some jointed corners, but I'm not sure yet.

EDIT: Actually, I think they may be using masking techniques to create the gap where the mouth is. The mouth is likely not even connected to the muzzle at all. I'll have to figure something else out to get that to work.