The Number of iterations option defines the number of iterative meshing steps. In each iteration, the mesh is proceeded such that edge lengths are converging into the given target value and vertices are evenly distributed on the surface.

When the option Curvature Adaptive Edge Lengths is activated, the algorithm performs a remeshing with an adaptive triangle size based on local curvature values instead of a fixed target size.

The remeshing aims to optimize the mesh such that the edge length converges to the Target edge length.

If Preserve domain boundaries is checked, the mesh vertices that are located on the domain’s boundary will remain on the boundary after remeshing.

When Smooth before remeshing is chosen, the smoothing step is performed before the remeshing algorithm starts. This is recommended when the Curvature Adaptive Edge Lengths is used.

When Smooth after remeshing is chosen, the smoothing step is preformed after the remeshing algorithm finishes. It often improves the quality of the resulting mesh. However, it may also result in features such as sharp edges not being preserved if the mesh resolution is not high enough. Technically, they are also not preserved during the remeshing, but the additional smoothing step at the end will erode those even further.

To illustrate the features, an example of a ball with 20 µm diameter with the voxel length 1 µm is used for meshing (Create Mesh), remeshing (Remesh Mesh), and smoothing (Smooth Mesh) to show the different meshes created.

First, a voxel mesh is created with the settings shown in the dialogs above, without any Coarsen.
Remesh Mesh is executed with 200 as the Number of iterations and 2 µm as the Target edge length.
The mesh is then smoothed with the Taubin filter

The two steps of Remesh Mesh and Smooth Mesh can be combined into one step using Smooth after remeshing in Remesh Mesh. Then, only the mesh after the final step is shown.