Intersection

• Want to know when objects come into contact → Collision Detection
• Want to know what to do when this happens → Collision Response

Collision Objects

extend CollisionObject2D

Area2D

defines a regions of 2D space and provides detection and influence

• emit signals when bodies enter or exit
• can override physics parameters in an area (gravity, damping)

StaticBody2D

not moved by the physics engine

• used for environment objects (with no dynamic behavior)
• can impart motion or rotation to a colliding body

RigidBody2D

implements simulated 2D physics

• apply forces (gravity, impulses,...) to it and physics engine calculates
• Modes
  • Rigid: default
  • Static: behaves like StaticBody2D
  • Character: ~Rigid, no rotation
  • Kinematic: ~KinematicBody2D

KinematicBody2D

provides collision detection, but no physics

• movement + collision response implemented in code
  • position set directly
    • move_and_collide(), move_and_slide()
      • moves body along a given vector, will stop if collision detected
      • returns a collision object (KinematicCollision2D)
• only do body movement in _physics_process()