Hi @kristu
We have discussed similar issue in this topic How to get the elements inside a boundingbox?. Using @Einar_Raknes (Thanks to Einar) solution i have slightly modified the script to work for you inside the crop region window. I have selected the crop region boundary to get Bounding Box using custom node “BoundingBox.ByElement” from clockwork package. Below is the process in action.
Here is the DYN Script getElementsInBB(Crop Region).dyn (13.8 KB)