如何编程从枪管尖端发射的炮弹？答案

【问题标题】：How to program the cannon ball to be shot from the tip of the barrel?如何编程从枪管尖端发射的炮弹？
【发布时间】：2019-11-30 23:22:02
【问题描述】：

我正在用 C# 编写一个用于炮弹轨迹的脚本。佳能球是一个带有脚本的预制件，用于从佳能射击时的轨迹。我可以使佳能球以或多或少的正确角度射击佳能枪管倾斜的角度。但是当我尝试结合重力时，连续的佳能射击失败了。第一个佳能球似乎以正确的角度射击并遵循重力定律，但无法射出第二个佳能球。

一般来说，我们有一个佳能脚本，它可以在按下空格键时创建一个佳能球预制件。佳能脚本将枪管的旋转角度和按下空格键的时间传递给炮弹脚本。佳能脚本使用Translate方法根据角度参数平移佳能球，并通过从y-速度中减去(Time.time-createdtime)^2*gravity来结合重力机制。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

//This is the script for the cannon
public class PlayerController : MonoBehaviour
{   
    int time = 1;
    float minRotation = -90;
    float maxRotation = 0;
    Vector3 currentRotation;
    public Transform fireBall;
    canonTrajectory ct;
    public float speed = 5f;
    public Transform circle;
    // Start is called before the first frame update
    void Start()
    {
        ct = fireBall.GetComponent<canonTrajectory>();
        currentRotation = transform.parent.localRotation.eulerAngles;
    }

    // Update is called once per frame
    void FixedUpdate()
    {

        if(Input.GetKeyDown(KeyCode.UpArrow))
        {
            currentRotation.z -= 5.0f;
            currentRotation.z = Mathf.Clamp(currentRotation.z, minRotation, maxRotation);
            transform.parent.localRotation = Quaternion.Euler(currentRotation);

        }
        if(Input.GetKeyDown(KeyCode.DownArrow))
        {
            currentRotation.z += 5.0f;
            currentRotation.z = Mathf.Clamp(currentRotation.z, minRotation, maxRotation);
            transform.parent.localRotation = Quaternion.Euler(currentRotation);
        }

        if(Input.GetKeyDown(KeyCode.Space))
        {
            ct.setCreatedTime(Time.time);
            ct.setRotationAngle(currentRotation.z);
            Transform fireInstance;

            fireInstance = Instantiate(fireBall, new Vector3(transform.parent.position.x, transform.parent.position.y+3.0f, transform.position.z), transform.rotation) as Transform;

            Transform c = Instantiate(circle, fireInstance.transform.position, Quaternion.identity) as Transform;

            c.SetParent(fireInstance.transform);



        }
    }

}









using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class canonTrajectory : MonoBehaviour
{
    public static float rotationAngle;
    float createdTime;
    float speed = 150f;
    float gravity = -200.0f;
    public GameObject turkey;
    static int NUM_PARTICLES = 26;
    Vector3[] m_position = new Vector3[NUM_PARTICLES];
    LineRenderer lineRenderer;
    public void setCreatedTime(float time)
    {
        createdTime = time;
    }
    public void setRotationAngle(float angle)
    {
        rotationAngle = angle;
    }

    public float GetRotationAngle()
    {
        return rotationAngle;
    }
    void Start()
    {
    }

    void FixedUpdate()
    {

        float directionx = Mathf.Cos(-rotationAngle*2.0f*Mathf.PI/360.0f);
        float directiony = Mathf.Sin(-rotationAngle * 2.0f * Mathf.PI / 360.0f);
        Debug.Log(-rotationAngle * 2.0f * Mathf.PI / 360.0f);
        float directionVectorLength = Mathf.Pow(Mathf.Pow(directionx, 2) + Mathf.Pow(directiony, 2), (0.5f));

        Debug.Log("created time: "+createdTime);
        transform.Translate(-5 * directionx, 2 * directiony-(Time.time-createdTime)* (Time.time - createdTime) * 2.0f , 0.0f);

        if (transform.position.x < -300)
            Destroy(gameObject);

        if (transform.position.y < -77)
            Destroy(gameObject);
    }
}

这是射击动作的图片。如您所见，重力不起作用，同时发射了多个炮弹。 enter image description here

【问题讨论】：

创建一个空的游戏对象，作为你的枪的孩子，你想从那里射击，然后在那个位置实例化

标签： unity3d

【解决方案1】：

此脚本工作仅当您假定玩家沿 X 轴定向时。可能是您旋转了球员，这就是球旋转的原因。

如果您可以制作一些有关该问题的视频，您还可以获得更多帮助。只需截屏几秒钟长的 gif。

【讨论】：