Once the geometry has been created from an image and all compartments have been assigned a colour, a meshed approximation to the geometry is automatically constructed.
The Boundaries tab shows the boundaries between compartments that have been automatically identified. The number of points used for each boundary can be altered here to refine or coarsen the boundary approximation.
The Mesh tab shows the generated triangular mesh with the currently selected compartment highlighted. The maximum triangle area for each compartment can be altered here to refine or coarsen the mesh.