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The last little rigging thing I want to show you is actually a constraint. It's called Point On Poly. It allows you to finally constrain an object to an actual point on a polygonal object. Let me show you how this works. I'm going to go to Polygons. And I'm just going to create a very simple object. I'm going to create a sphere. Let's go ahead and shade that by hitting 5. And then I want to create an object that I'm going to constrain to this. So let's just create a very small little cube or a box.
So I've got two objects. And what I want to do is constrain this cube to the surface of this sphere. So what I need to do is select a component of the sphere. I can select the face, an edge or a vertex. To make this really simple, I'm just going to select the Vertex. I'm going to right-click over this. Go into Vertex mode. And then just go ahead and pick one of the vertices. Now I'm going to Shift-Select the box.
So I have two things selected. First, I select the component. Then I select the box. Now all that's left to do is go Constrain > Point on Poly. And let's take a look at the options. There really aren't that many. You can constrain all axes or a specific axis and as with any constraint you can add a weight. So let's go ahead and add that constraint. And what happens is the center of that cube snaps to that point.
And I go back to Object mode and I move that sphere around. Of course the object is going to stick. But if I scale it, notice how it still sticks to the surface. But it doesn't scale. So even if I scale it wider, you can see how it sticks to the surface at that vertex no matter what. And in fact, I can even go back into Component mode and select Vertices and just move them around. And the object will still stick.
This is great for sticking objects to anything. You can conceivably use it for something like buttons on a character or maybe a bowtie, really any sort of object that you want to stick to a place on another object, you can now do it. And I'm sure you can see the possibilities that you can have with this sort of constraint.
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