#birdcore

#Features

• Semi-implicit Euler integration with fixed timestep (DT = 1/60)
• Collision detection: circle-circle, circle-AABB (clamp closest-point), AABB-AABB
• Impulse-based resolution with restitution, mass-ratio separation, slop tolerance
• Sleeping system (low-velocity sleep, wake on high-speed contact) for stable stacking
• Material system: per-material density / restitution / damage threshold / HP (wood, ice, stone, pig, TNT, bird, ground)
• Blast: radius damage with falloff + radial impulse; same-frame multi-blast unified resolution (chain-reaction safe)
• Pure logic, zero platform dependency — fully unit-testable with moon test

#Usage

import {
  "tanxiansheng221/birdcore@0.1.1",
}

let w = World::new()
w.add({ px: 0.0, py: 0.0, vx: 0.0, vy: 0.0, kind: BlockK,
        shape: Box(48, 18), mat: Wood, hp: mat_hp(Wood),
        asleep: false, sleep_t: 0.0, dead: false })
let damages = w.step(DT)   // returns per-step damage events

#Tests

moon test --target wasm

#License