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This PR adds a
dilation_distancekeyword to theProjectionProblemAPI in the Julia API that provides an easy way to expand the solid region by approximatelydilation_distancein all directions (or shrink/erode it ifdilation_distanceis negative).Additionally, in the high-level api, the functions
ssp1,ssp1_linear, andssp2accept an optional trailing positional argument for thedilation_distance.Tests were added for the adjoints w.r.t. the filtered density in the presence of a non-zero dilation for both the low-level and high-level APIs.
Additionally, I added an example that demonstrates the effect of the dilation/erosion on Cassini ovals.