一种在Unity中从世界坐标转UI坐标的方法

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世界坐标→屏幕坐标→UI坐标

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Vector3 screenPos = (Camera)mainCamera.WorldToScreenPoint(worldPos);
if (RectTransformUtility.ScreenPointToLocalPointInRectangle(
    (RectTransform)uiWindow.transform, screenPos, (Camera)uiCamera, out Vector2 localPoint)) {
    transform.localPosition = localPoint + extraOffset + verticalOffset;
}