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world.addCollisionFilter('player','.子弹')    
//首先先导入一个子弹的模型，为0，0，0，1的默认角度
    //子弹创建代码：
    console.clear()
    async function shoot(entity = new Box3Entity) {
        var speed = 5;//越大越快
        const e = world.createEntity({
            mesh: 'mesh/子弹.vb',//其实未必要子弹，弓箭啥一样的
            meshScale: new Box3Vector3(0.0625, 0.0625, 0.0625),//自己调整
            gravity: false, //通过代码控制，而不是使用自带的
            collides: true,//也是使用代码控制，防止打到墙壁会反弹，使用代码还可以有一点穿透效果
            position: entity.position,
        })
        e.speed = speed
        e.own = entity
        e.addTag('子弹')
        var angle = Math.atan2(entity.player.facingDirection.z, entity.player.facingDirection.x)
        //敲重点：
        e.velocity.set(
            Math.cos(angle) * Math.cos(-entity.player.cameraPitch) * speed,
            Math.sin(-entity.player.cameraPitch) * speed,
            Math.sin(angle) * Math.cos(-entity.player.cameraPitch) * speed,
        )
        e.meshOrientation = new Box3Quaternion(0, 0, 0, 1).rotateX(
            Math.atan2(e.velocity.y, Math.sqrt(e.velocity.x ** 2 + e.velocity.z ** 2))
        ).rotateY(angle)
e.onVoxelContact(()=>{
e.destroy()
})        
	await sleep(10000);
        //10秒后消失，防止太多飞出边界
        e.destroy()
    
}

    world.onPress(async ({ entity, button, raycast }) => {
        if (button == Box3ButtonType.ACTION0) {
            while (entity.player.action0Button) {//连射
                shoot(entity)
                await sleep(100)//连射间隔，自己定
            }
        }
    });

    (async function () {//主循环
        while (1) {
            world.querySelectorAll('.子弹').forEach((e) => {
                var angle = Math.atan2(e.velocity.z, e.velocity.x)
                var up = Math.atan2(e.velocity.y, Math.sqrt(e.velocity.x ** 2 + e.velocity.z ** 2))
                e.meshOrientation = new Box3Quaternion(0, 0, 0, 1).rotateX(
                    up
                ).rotateY(
                    angle
                )
                e.velocity.y -= 0.05//重力下垂
                var hitBox = new Box3Bounds3(e.position.sub(e.bounds), e.position.add(e.bounds));
                var hitEntities = world.querySelectorAll('*').filter(a => hitBox.intersects(new Box3Bounds3(a.position.sub(a.bounds), a.position.add(a.bounds))))
                for (let entity of hitEntities) {
                    //自己写！
                }
            })
            await sleep(100)
        }
    })()

喜爱的话记得一键三连（滑稽）