[英]How do I raycast from a sphere to an ui element in the canvas
I would like to Raycast from the center of Sphere GameObject to find the text/image element being hit by the ray.我想从 Sphere GameObject 的中心进行 Raycast 以找到被光线击中的文本/图像元素。 I'm using Physics.RaycastAll to detect the UI element being hit.我正在使用 Physics.RaycastAll 来检测被击中的 UI 元素。 Following is my code.以下是我的代码。
public class RaycastUI : MonoBehaviour
{
public GameObject Sphere;
private Vector3 _origin;
private Vector3 _direction;
void Update()
{
RaycastHit[] hits;
// get the origin and direction
_origin = Sphere.transform.position;
_direction = Sphere.transform.forward;
//raycast all
hits = Physics.RaycastAll(_origin, _direction, 100.0F);
// retrieve the names of the element that are hit by the sphere.
for (int i = 0; i < hits.Length; i++) {
RaycastHit hit = hits[i];
Debug.Log(hit.collider.name);
}
}
}
I have added BoxCoilloider to the canvas.我已将 BoxCoilloider 添加到画布上。 Unfortunately, hits.Length
always returns 0. am I missing something?不幸的是, hits.Length
总是返回 0。我错过了什么吗? How do I ray cast from the sphere to the ui element in the canvas to check if it has collided?如何从球体向画布中的 ui 元素投射光线以检查它是否发生碰撞?
I think you have to use the EventSystem
if you want to check against UI elements.如果您想检查 UI 元素,我认为您必须使用EventSystem
。
Try something like this:尝试这样的事情:
private void GetUIObjectsOfPosition(Vector2 screenPosition)
{
var eventDataCurrentPosition = new PointerEventData(EventSystem.current);
eventDataCurrentPosition.position = screenPosition;
var results = new List<RaycastResult>();
EventSystem.current.RaycastAll(eventDataCurrentPosition, results);
foreach (var result in results) {
Debug.Log(result.gameObject.name);
}
}
You can calculate the screen position from your spheres world position using Camera.WorldToScreenPoint .您可以使用Camera.WorldToScreenPoint从球体世界位置计算屏幕位置。
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