2D Game Development Engine 4

Question 1

Which broad-phase technique helps a 2D engine avoid checking every object pair for collisions?

Accepted Answer

Spatial partitioning (e.g., grid or quadtree)

Answer

Spatial partitioning narrows collision checks to nearby objects, avoiding O(n²) comparisons.

Question 2

What is AABB collision detection?

Accepted Answer

Axis-aligned bounding box overlap testing

Answer

AABB checks whether two axis-aligned rectangles overlap, a fast common 2D collision test.

Question 3

In a 2D physics engine, what does 'restitution' control?

Accepted Answer

The bounciness of a collision

Answer

Restitution determines how much energy is preserved in a bounce after a collision.

Question 4

What is the difference between a kinematic body and a dynamic body in a 2D physics engine?

Accepted Answer

Kinematic is moved by code and ignores forces; dynamic responds to forces

Answer

Kinematic bodies are script-controlled and unaffected by physics forces, unlike dynamic bodies.

Question 5

What is a 'sensor' or 'trigger' collider used for?

Accepted Answer

Detecting overlap without producing a physical collision response

Answer

Trigger colliders report overlaps for events without applying physical collision response.

2D Game Development Practice Test