anglecalc.ts

function angleCalculator(enemyPos : IPos, myPos : IPos) : IAngle {
    const deltaX = myPos.x - enemyPos.x;
    const deltaY = myPos.y - enemyPos.y;
    const deltaZ = myPos.z - enemyPos.z;

    const pitch = Math.atan2( deltaY, deltaZ );
    let yaw;

    if (deltaZ >= 0) {
        yaw = -Math.atan2(deltaX * Math.cos(pitch), deltaZ);
    } else {
        yaw = Math.atan2(deltaX * Math.cos(pitch), -deltaZ);
    }

    return {
        pitch,
        yaw,
    }
}