Start with a 3D-model of a fibrous material that has been loaded in memory and is displayed in the Visualization area.

In the FiberFind section, select Estimate Fiber Diameters from the pull-down menu and click the Options àEdit... button.

In the opening Fiber Diameter Estimation dialog, enter the desired Result File Name (.gdr) or keep the default FiberDiameters.gdr.

From the Material to Analyze pull-down menu, select to analyze All Solid Materials in the 3D-model (analyze all solid and porous materials), only a Chosen Material, or materials of the Chosen Material IDs.

When Chosen Material is selected, it is possible to analyze any material included in the model.

When Chosen Material IDs is selected, the user can choose to analyze any of the 256 Material IDs that could appear in a model. This can be used when a material appears through overlapping of fibers, or to exclude binder from the fiber diameter analysis.

Check Remove Fiber Fragments at Domain Boundary to remove fragments of fibers that touch the domain boundary after running the fiber identification algorithm. Fibers which are cut at the domain boundary might distort the resulting statistics towards shorter lengths if this option is not selected. The diameter statistics might also be affected.

If the material is periodic in one or several directions, this can be accounted for by checking the boxes for Periodicity. For example, for periodicity in x-direction, fibers leaving the domain on one end in x-direction will be considered to relate to a fiber starting at the other end of the domain with similar y and z values. This is usually only true for periodically generated FiberGeo structures or e.g. for weave structures. Most scans of real material will not exhibit periodicity.

If any information is available about the minimal fiber diameter, this information can be entered in Minimal Fiber Diameter. This speeds-up the computation, as the algorithm starts with this minimal diameter and not with zero for the diameter estimation. However, since fiber segments with diameter smaller than the value given are ignored if they are not connected to a larger fiber, the recommendation is to enter a fiber diameter slightly smaller than the one known, to make sure that all fiber segments are considered. The minimal diameter can be given in meter or as number of voxels.

The Bin Size (in Voxels) defines the resolution of the diameter analysis for the result visualization as histogram and for the computation of diameter distribution for one or several types of fibers. It can also be changed after the run from within the GeoDict Result Viewer.

A result file with the given Result File Name is saved in the chosen project folder (File → Choose Project Folder...) after the analysis, and a Result Viewer opens, showing the calculated values.