What is Skeletal Animation Technique?

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What is Skeletal Animation Technique?
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Index

• What is Skeletal Animation?
• What is Skeletal Animation Technique Process
• 1. Skeleton
• 2. Rigging
• 3. Keyframes
• 4. Output
• Advantages and Disadvantages of Skeletal Animation

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What is Skeletal Animation?

• Skeletal animation is a technique in computer
  animation in which a character is represented in
  two segments a surface representation used to
  draw the character (called skin or mesh) and a
  hierarchical set of interconnected bones (called
  the rig or skeleton) used to animate (pose or
  keyframe) the mesh.

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• While this technique is often used to animate
  humans or more commonly for organic modelling, it
  only serves to make the animation process more
  intuitive, and the similar technique can be used
  to control the deformation of any object a door,
  a spoon, a building.

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• When the animated object is more general than for
  example a humanoid character the set of bones may
  not be hierarchical or interconnected, but it
  only represents the higher level description of
  the motion of the part of mesh or skin it is
  influencing.

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Skeletal Animation Technique Process
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1. Skeleton

• The skeleton is the most important object in a
  skeletal animation Process.
• A skeleton is a set of bones that can be
  hierarchically organized.

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• Usually an object has some important joints.
• For instance, for a character, the most important
  joints are the hip, the knee, the neck, etc.

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2. Rigging

• Once a skeleton step is done next is rigging.
• In rigging place the bones exactly where they
  would be in a real-world skeleton.
• Each defined bone must be connected to its
  belonging part of the object being animated.
• In this way, the bones control in the final
  movements.

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3. Keyframes

• A keyframe in animation is a drawing that defines
  the starting and ending points of a smooth
  transition.
• A sequence of keyframes defines a series of
  movements the viewer will see in the final
  animation.
• To have a smooth transition between keyframes
  other in-between ones are inserted.

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• For obtaining a particular pose of the character,
  you need to change the position of the bones.
• It can be done by using geometric transformations
  such as rotation, translation and scaling.
• All skeletal animations have keyframes.

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4. Output

• Once the keyframes are set up, and the animation
  looks good when playing into the loop you are
  ready to use it anywhere.

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Advantages and Disadvantages of Skeletal Animation
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Advantages of Skeletal Animation

• 1. The skeletal animation uses tools that make
  the process of animation simpler.
• 2. Skeletal animation allows you to make dynamic
  animations because you can manipulate (translate,
  rotate, scale) all characters bones at runtime.

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• 3. Bone-based animations are simpler when you
  want to make multiple animations for one
  character.
• 4. Skeletal animation requires a fewer image and
  less memory.
• 5. Skeletal animation allows you to create a
  natural movement with the help of inverse or
  forward kinematics.

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Disadvantages of Skeletal Animation

• 1. Skeletal animations are more complex.
• 2. Skeletal animations require more processor
  time.
• 3. Skeletal animations have the impediment of
  bone rigidity.

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