Can we use a value of center that is outside of the domain? E.g. if we want to model a shell with a pointmass, can the value of center be at the origin, but ymin be at some large positive value?

Description of the desired feature

Would be nice to have a simple example on how to use the DatasetAccessorPrismLayer class.
The example should use the prism_layer function to define a layer of prisms and then use the prism_layer accessor to use some of the methods and properties defined in the DatasetAccessorPrismLayer class.
It should be very similar to the one in the Example Ga

Hi possible contributors!

Something that would make for a great first issue is to download and compile SWIFT, and then check out the examples and try running a few. The majority of these examples currently use python2 scripts for initial conditions generation and analysis; it would be great if you could upgrade these to use python3 instead.

Thanks!