UCA Game Physics & Animation 4

Question 1

What is the purpose of 'Inverse Kinematics' (IK) in Unity animations?

Accepted Answer

Solving joint rotations backward from an end effector goal position

Answer

IK computes the bone chain rotations needed to place an end effector (hand, foot) at a target position, moving from tip back toward the root.

Question 2

Which Unity method applies a force to a Rigidbody at a specific world-space point, potentially causing torque?

Accepted Answer

AddForceAtPosition

Answer

AddForceAtPosition applies a force at a given world point, which can cause both linear acceleration and rotational torque if the point is off-center.

Question 3

What does a 'Ragdoll' in Unity typically consist of?

Accepted Answer

A hierarchy of Rigidbodies and Colliders connected by Character Joints

Answer

A ragdoll is created by adding Rigidbodies, Colliders, and Character Joints to a character's bone hierarchy so it can simulate physical collapse.

Question 4

What is the difference between 'Kinematic' and 'Dynamic' Rigidbodies in Unity?

Accepted Answer

Kinematic bodies are moved by script and do not respond to physics forces; Dynamic bodies are fully physics-driven

Answer

A Kinematic Rigidbody is moved via Transform or MovePosition/MoveRotation by code and cannot be pushed by physics forces, while a Dynamic one responds to gravity and collisions.

Question 5

In Unity's 2D physics, which component is the equivalent of a 3D SphereCollider?

Accepted Answer

CircleCollider2D

Answer

CircleCollider2D is the 2D counterpart to the 3D SphereCollider, defining a circular collision boundary.

(UCA) Unity Certified Associate Game Developer Practice Test

(UCA) Unity Certified Associate Game Developer Practice Test

UCA Game Physics & Animation 4