CityEgnine中的Crop Image 菜单灰色不可用

【解决办法】：
CityEgnine 2015 版本中 Crop Image 灰色不可用是个已知的bug，有个变通方案可用。


打开CItyEngine后，先不要做任何操作，然后从Navigator中浏览到任意一个图片，然后再到菜单栏 shape 菜单中去找到 Crop Image 就可用了。

这样做了之后，在关闭 CityEngine 之前都好用，下次打开不要忘记还要这样操作。


相关的说明，在官方的论坛上有esri工程师提到，如果感兴趣，可以看看：

https://geonet.esri.com/thread/161159

其中：
We found a workaround to make the crop tool work. When you open CE, just click on an image file in the File Navigator in CE, and THEN click the Shapes menu. To rephrase: don''t touch the Shapes menu until after you click on an image in the Navigator, such as YourFacade.jpg. The crop tool should be enabled and should stay enabled until CE is shutdown. The way to not have it work is to open the Shapes menu before clicking on an image. As previously stated, this is a bug, but hopefully this will work for now. I say hopefully, because we need you to test this workaround. If you find exceptions to this, or if this just doesn''t work for you, please reply. I didn''t test on versions before 2015.0.