标记一个 VisualElement，其中托管许多应用了 DynamicTransform 的子项。 此提示的一个常见用例是 VisualElement，它表示一个“viewport”，其中存在许多可以分别移动的 DynamicTransform VisualElements，此外，该“viewport”元素还经常改变其变换。但是，如果前面提及的 "viewport" 元素的内容基本为静态（非移动），那么在该元素中使用 DynamicTransform 提示已足够，而不必使用 GroupTransform。 在内部，用 GroupTransform 提示的元素将强制单独的绘制批处理使用自己的世界变换值，但同时，无论何时 GroupTransform 元素中发生变换更改，它都将避免更改其所有后代的变换。
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