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control.viewPort.CameraController.CameraRotationMode = CameraRotationMode.Turnball;
抛出有用的错误
“您的.exe 中发生了‘System.NullReferenceException’类型的异常，但未在用户代码中处理”
RotateGesture 可以工作，也可以添加孩子，但 RotationMode 没有变化 - 为什么？