Interface ParticleRect

Particle-world collision via AABB checks against obstacle list. Designed for lightweight debris/spark bouncing, not full physics.

Usage:

const collision = new ParticleCollision();
collision.addObstacle({ x: 0, y: 500, width: 800, height: 20 }); // floor
// In particle update loop:
collision.resolve(particle); // bounces particle off obstacles
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