| origin | 所请求观察体的原点。 |
| extents | 所请求观察体的范围（以米为单位）。 |
此方法在请求位置将观察体设置为轴对齐盒体。成功调用此方法后，可根据需要调整观察体的形状和/或将其移入场景。范围是从盒体中心沿各轴方向到其边缘的距离。
如果观察体非常大，则调用 SurfaceObserver.Update 的开销将随着可观察表面的数量增加而增加。
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