//正交缩放操作可通过投影矩阵的参数配置进行调整
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//旋转除了旋转模型外，也可以改变相机位置和相机观察方向进行
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//在MouseMove事件中计算旋转四元数
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//float dx = e.X - _lastMousePos.X;
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//float dy = e.Y - _lastMousePos.Y;
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// 根据鼠标移动量计算旋转角度
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//var roation_dx = dy / _radius;
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//var rotaion_dy = dx / _radius;
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//_rotationX += roation_dx;
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//_rotationY += rotaion_dy;
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//Quaternion rotationX = Quaternion.FromAxisAngle(Vector3.UnitX, dy / _radius);
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//Quaternion rotationY = Quaternion.FromAxisAngle(Vector3.UnitY, dx / _radius);
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// 更新四元数
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//_rotation = rotationY * rotationX * _rotation;
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//_rotation = Quaternion.Normalize(_rotation);
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//var eye = new Vector3(_mc.X, _mc.Y, _mc.Z + _radius * 2);
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//var target = _mc;
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//var up = Vector3.UnitY;
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//_rotation = Quaternion.Identity;
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//var rotationX = Quaternion.FromAxisAngle(Vector3.UnitX, _rotationX);
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//var rotationY = Quaternion.FromAxisAngle(Vector3.UnitY, _rotationY);
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//_rotation = rotationY * rotationX * _rotation;
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//_rotation.Normalize();
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//var matrix = Matrix4.CreateFromQuaternion(_rotation);
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//matrix.Invert();
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//eye = Vector3.TransformPosition(eye, matrix);
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//up = Vector3.TransformPosition(up, matrix);
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//_viewMatrix = Matrix4.LookAt(eye, target, up);
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//_forward = target - eye;
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//_forward.Normalize();
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