Isocaps

[sjkelly]

This came up on slack. In some cases a user may always want a manifold surface from the isosurface extraction routing. We can generate "isocaps" that close the ends of the surface where it intersect with the bounding box to ensure that the surface is manifold for 3d printing or visualization of cross sections.

[thchr]

Just seconding this; this addition would be awesome.

[dalarev]

Hack that @sjkelly posted on discourse works well in the meantime.