3D Modeling 3D Modeling Animation & Rigging

Question 1

What is a 'rig' in 3D character animation?

Accepted Answer

A system of bones, controls, and constraints that drive character deformation

Answer

A rig is the internal skeleton and control system that animators use to pose and animate a 3D character.

Question 2

What does IK stand for in character rigging?

Accepted Answer

Inverse Kinematics

Answer

Inverse Kinematics (IK) calculates joint rotations automatically based on the position of an end effector like a hand or foot.

Question 3

What is the difference between FK (Forward Kinematics) and IK (Inverse Kinematics)?

Accepted Answer

FK rotates parent joints to move children; IK positions the end goal and auto-solves parent joints

Answer

FK poses joints from parent to child (rotate shoulder → elbow → wrist), while IK lets you place the end goal and the solver works backward.

Question 4

What is skinning (or weight painting) in 3D rigging?

Accepted Answer

Defining how much each bone influences each vertex of a mesh during deformation

Answer

Skinning assigns influence weights from rig bones to mesh vertices, controlling how the mesh deforms when bones move.

Question 5

What is a keyframe in 3D animation?

Accepted Answer

A recorded value of a property at a specific point in time that the software interpolates between

Answer

A keyframe stores the value of an animated property at a specific time, and the software interpolates values between keyframes.

3D Modeling Practice Test