Unity - 如何获取父游戏对象中心的位置

Question

I've a question about how to get the transform created by the addition of child objects to a parent. It's easier to see what I mean by looking at the picture that follows. Tranform . I understand that the world position of the parent is effectively at 0 but how do I get the displayed one?

Best Regards

Answer 1

Some info, first. That location is where the Center of that GameObject is. The alternative to having the handles there is at the Pivot , which will put the handles at the same location as Transform.position . You can toggle between those two handle display modes in the Unity Editor.

So, you want to find the location of the Center handles. That depends on if the parent has a Renderer or not.

In your situation, where the parent object has no Renderer , you have to go into the children of the gameObject and average their transform positions:

Vector3 sumVector = new Vector3(0f,0f,0f);

foreach (Transform child in parentObject.transform)
{          
    sumVector += child.position;        
}

Vector3 groupCenter = sumVector / parentObject.transform.childCount;

If the situation were a little different and the parent gameObject had a Renderer , then it is much easier:

Vector3 groupCenter = parentObject.getComponent<Renderer>().bounds.center;

Answer 2

I met the same problem. Thanks for the answer of @Ruzihm. I want to make the center, but don't know whether the object has 'Renderer', so I write recursive function like this to get a center pos of the object.

Vector3 getCenter(Transform obj)
{
    Vector3 center = new Vector3();
    if (obj.GetComponent<Renderer>() != null)
    {
        center = obj.GetComponent<Renderer>().bounds.center;
    }
    else
    {
        foreach (Transform subObj in obj)
        {
            center += getCenter(subObj);
        }
        center /= obj.childCount;
    }
    return center;
}