What are the geometric preconditions for tools::TopologyToLevelSet?

[ky438]

I have some boolean grids that are roughly 'thin cylinders without endcaps' - similar to lofted (open) circles, but with various details. The thickness is around 1 to 3 voxels everywhere, and they doesn't have any holes (except for the missing 'end caps')

Is this adequate input for tools::TopologyToLevelSet , or does this tool require a completely watertight input bool grid?

If TopologyToLevelSet does require a watertight input:

• What's a good way to add end caps to a cylinder-like shape? Is there a way to flood fill a bool grid from a given internal point, restricted to a 'thin' bounding box?

• Can TopologyToLevelSet handle multiple (disconnected) input parts? If not, is there a way to segment a multi-part grid so that TopologyToLevelSet can be called on each, and then merge these level sets?