英文:
Raycast Not Detecting idle object in unity 2d
问题
我正在制作一个Unity的2D平台游戏。我尝试创建一个敌人，当他遇到墙壁或在平台边缘时会向前移动并转向，所以我给了他这个原型脚本：
public float speed;
public float raylength;
private Rigidbody2D rb;
private int dir = -1;
void Start()
{
rb = GetComponent<Rigidbody2D>();
}
void FixedUpdate()
{
rb.velocity = new Vector2(speed * dir, rb.velocity.y);
RaycastHit2D hit = Physics2D.Raycast(transform.position, new Vector2(dir, 0), raylength);
if(hit.collider != null && hit.collider.gameObject.name!="Slime")
print(hit.collider.gameObject.name);
if (hit.collider.gameObject.tag=="Ground")
{
dir*=-1;
}
}
由于某种原因，只有当玩家移动时，史莱姆才会打印出"player"，而只有在几秒钟后进入地面时，才会打印出"ground"。我尝试将他的速度设为0并让玩家与他碰撞，但只有当他与射线的起点碰撞时才会打印"player"，尽管我尝试将射线长度设置为很大的数字，但结果都一样。如果您对刚体（rigidbody）和盒子碰撞器（box collider）的值感兴趣，我已激活了盒子碰撞器中的"Is Trigger"选项，并使它成为了运动学（kinematic）的。
英文:
I am making a 2d platformer game in unity. I'm trying to create an enemy moves forward and turn when he meets a wall or on the edge of the platform so I gave him this prototype script
public float speed;
public float raylength;
private Rigidbody2D rb;
private int dir = -1;
// Start is called before the first frame update
void Start()
{
rb = GetComponent<Rigidbody2D>();
}
// Update is called once per frame
void FixedUpdate()
{
rb.velocity = new Vector2(speed * dir, rb.velocity.y);
RaycastHit2D hit = Physics2D.Raycast(transform.position, new Vector2(dir, 0), raylength);
if(hit.collider != null && hit.collider.gameObject.name!="Slime")
print(hit.collider.gameObject.name);
if (hit.collider.gameObject.tag=="Ground")
{
dir*=-1;
}
}
for some reason the slime only prints player when the player is moving and only prints ground when he enters the ground after few seconds I tried setting his speed to 0 and making the player collide with it but it only print player when he collides with the origin of the raycast althought i tried to set the ray length to insane numbers but same result.
if you are interested in the values of the rigidbody and the box collider so i activated is trigger in the box collider and made him kinematic
答案1
得分: 0
Raycast 只会检测到一个物体，我认为你的代码是从射线发出的位置检测物体。进入编辑 > 项目设置 > 物理 2D > 取消选中“在碰撞体内开始查询”。现在，你的 Raycast 应该能够检测到父对象外部的物体。
英文:
Raycast will detect only one object, I think yours is detecting the object from where ray is originating. Go to Edit>Project settings>Physics2d> Uncheck Queries start in Colliders.
Now your Raycast should detect objects outside your parent object.
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