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Feel free to try this advanced challenge problem to continue to test your list and custom block skills.  Create a CB that will keep any implicit in a list that is at least partially within a region given. The final output of the CB should be an implicit body list of the items that intersect the region. Once this workflow and CB are created, create a second example file that shows this work using a list of 5 spheres that are 5mm spaced apart with a radius of 2mm (created using the CB Line of Spheres from the previous test problem). Feel free to use any region as your test region. There should be an option to either keep or remove items that are all/partially inside the body.
Note: There are many ways to do the same task in nTop. The answer shown to this problem uses the CB List Processed Booleans and the CB If from a previous lesson in this course. You can download these custom blocks below if you would like to use them in your workflow.
Example of final result Estimated Time to Complete: 40 minutes 
Tip:
The answer shown in the next lesson uses the Evaluate Field block which will provide the scalar value of the field at a point. Your solution may use a different process, but if you want to learn more about fields, please visit our 220: Intro to Field Driven Design course.
Example File: 230_16_1 & 21_1 CB – If.ntop Report File Issue This file was last updated in nTop 3.38.4 Example File: 230_7_6 & 21_2 CB – List Processed Booleans.ntop Report File Issue This file was last updated in nTop 4.2.3