Welcome to rigging | Rigging | Computer animation | Khan Academy

Welcome to rigging | Rigging | Computer animation | Khan Academy


– What’s the difference
between motion and life? What’s the difference
between this mechanical smile and this friendly smile? It’s a little harder to find, but there’s just something about the way a living being moves. And we work incredibly hard to capture with our characters here at Pixar and that something start with a stage we call rigging. Hi, I’m Brian Green, a Rigging Technical
Director here at Pixar. Rigging is a process of adding controls to a digital model to allow animators to
move it around and act. When you look at the way
a living being moves, every motion they make causes a reaction in every other part of their body. For instance, when I smile, it’s not just my lips have moved, my cheeks bulge, the skin around my eyes crinkle. My chin stretches out to
accommodate the emotion. We call this defamation and displacement. Arrlalalala. In rigging, we have a toolbox of hundreds of different deformers and we can attach to the surface mesh of our characters. All of them represent
mathematical formulas that define a relationship
between the many points that are affected by the motion. For instance, I can start
rigging Sully’s mouth by adding a simple
deformer called a rotate. The underlying math here is trigonometry. I’m going to add another
tool called a repulsor. This basically puffs things in and out. Add this to the cheeks, and link them. And then when we move his jaw, his cheeks bulges. That’s better, but it’s still just the beginning. Sully’s face alone uses over 500 deformers and that’s just his face. We can take a similar approach to rigging the characters’ bodies too. Adding deformers that
define a relationship between the knees and the calf, the tail and the rump, or this tentacle and that tentacle. After we got the physiology right, we need to remember that these characters are film actors. So the kind of motion
that they may need to make might be a little more extreme
than a regular monster. So we push it a little, gives them extra life so they can be extra
exciting on the screen.

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  1. Fantastic video. I will show it to my trigonometry class tomorrow to answer a student's question where will I use trig in digital art. Thank you.

  2. "Argh! Computer animation is just the lazy, cheap way of making a movie!! Nothing compares to old sweet school hand drawn animation!" . . .

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