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Learning path · 9 steps

Collision & physics engine basics

From rays and normals to broad phase, tunneling and rigid bodies: the core of a small physics engine.

Start: Vector Basics
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  1. Mathematicscore1. Vector BasicsEverything below is vector math.
  2. Three.js & Renderingcore2. RaycastingAsk the world what a line hits first.
  3. Three.js & Renderingcore3. Surface NormalsWhich way a surface faces: bounces and slopes.
  4. Performancecore4. Spatial PartitioningAvoid testing every pair of objects.
  5. Systemscore5. Hitboxes & HurtboxesGameplay overlap tests for attacks.
  6. Systemscore6. Tunneling & Continuous CollisionCatch fast objects that skip through walls.
  7. Systemscore7. Fixed TimestepStable, repeatable integration.
  8. Physicscore8. Projectile MotionThe analytic reference for ballistic motion.
  9. Physicscommon9. Rigid Body DynamicsMass, inertia, torque and impulses in one body.