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In addition to swimming, our shark will need to open and close his mouth. Now to make this happen we're going to need to create something called a rig. Now anytime you hear the word rig in relationship to an animation inside of 3D applications like CINEMA 4D or any other application, it really relates to a set of controls that are used to make your object do something specific. Now those controls could be very complicated or they can be very simple. Now in the case of our shark their controls are very simple. What we need to do is to create a relationship between the movement of the jaw geometry for the actual shark body and the rotation of the gums.
I've have done this ahead of time and I can show you guys what I'm talking about here. On the shark geometry, which is this cube body right here, I have something called a Morph tag. The Morph tag allows us to create a state of geometry that reacts to a slider. I'm going to of a switch my Morph tag over to Edit mode and click on the word Open here. The Open is what's called a morph state, and when I do that, you see that my geometry actually pops open. This morph state is a direct manipulation of the original base morph state. So what I did was I took the points of the shark model and moved them around to get his mouth to actually open. Now when I switch to Animate mode, I have now a slider that is linked to that state.
When I move that slider, the shark mouth opens and closes. Now you'll notice that the gums are actually moving along with it and what I've done for the gums is I've added something called an XPresso tag and this XPresso tag, when you double-click on it, it brings up the XPresso Editor. You can see that this node here represents the Morph tag and I've linked the open slider to something called a Range Mapper, which translates the values from the open slider into rotation values that are linked to the lower jaw symmetry object. So, by moving the slider on the Morph tag, the values here from 0 to 100% get translated into rotation parameters that will move the shark's mouth open and closed.
That's really all there is to it. The rig process can become very very time-consuming and intensive, but for our shark, this is really all we need. Now I've prepared this shark ahead of time, but in this chapter we're going to go back a step and really recreate this rig from scratch.
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