炸弹投掷路线主要还是使用射线来进行生成，原理是计算当前的投掷方向，往前发射一段距离，判断是否有触碰到物体，如果这个时候没有碰到物体则重新计算方向，当前地点，继续向计算好的方向发射射线，直到射触碰到到物体而已，当然也不能无止境去计算去改变方向，必须设置一个长度，某则在某些情况会导致卡顿设置内存溢出。把其中的每次改变方向的坐标的存储起来，用LineRenderer来进行画出轨迹，最后当要投掷出炸弹时，让炸弹根据得到的List进行移动就行了。下面放核心代码。
bool targetAcquired;
public LineRenderer laser;
public int laserSteps;//射线拐点总数
public float dropPerSegment;//每段下降距离
public float laserSegmentDistance;//每段射线发射距离
public int collisionLayer;
public Vector3 targetPos;
public void TrajectoryCalculation()
{
targetAcquired = false;
RaycastHit hit;
Vector3 origin = transform.position;
laser.SetPosition(0, origin);

    for (int i = 0; i < laserSteps - 1; i++)
    {
        Vector3 offset = (transform.forward + (Vector3.down * dropPerSegment * i)).normalized * laserSegmentDistance;

        if (Physics.Raycast(origin, offset, out hit, laserSegmentDistance))
        {
            for (int j = i + 1; j < laser.positionCount; j++)
            {
                laser.SetPosition(j, hit.point);
            }

            if (hit.transform.gameObject.layer == collisionLayer)
            {
                laser.startColor = laser.endColor = Color.green;
                targetPos = hit.point;
                targetAcquired = true;
                return;
            }
            else
            {
                laser.startColor = laser.endColor = Color.red;
                return;
            }
        }
        else
        {
            laser.SetPosition(i + 1, origin + offset);
            origin += offset;
        }
    }

    laser.startColor = laser.endColor = Color.red;
}