Voxel Selection
Modification of structure models can be done on the voxel geometry or the analytic description (GAD data) of a structure.
Edit simple or complicated microstructures by manual drawing, e.g., to correct problematic boundary effects, or remove artifacts from 3D structures built from imported 3D-image data (micro-CT, nano-CT, SEM, …).
As an example, a voxel structure of a fibrous media model generated with FiberGeo is loaded (indicated by the green dot before Structure). Analytical data fitting to the voxel data is available (indicated by the green dot before GAD Objects).
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Note! When editing the voxel structure, the analytic object information will not be modified! Therefore, the analytic object description in the model does not fit anymore to the loaded structure after editing. The initially green dot before GAD Objects turns yellow, if one of the operations listed below is applied.
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Select voxels to edit
You can edit voxels in 2D Cross Section (SEM) view or in 3D Rendering. First, zoom into the structure to the voxel(s) you want to select.
To enter the Voxel Selection mouse mode, click the  icon in the toolbar. This also opens the Voxel Selection dialog from the GUI sidebar.
Left-click on a voxel to select it. A cyan-colored frame appears at the edges of the selected voxel. To select several voxels at the same time, press and hold the Shift key while clicking the voxels.
In the Voxel Selection dialog, a table shows information about the selected voxel(s), such as Position in X, Y, Z coordinates and Material ID. Additional information shown depends on the loaded structure and fields, e.g. if a volume field is loaded, the values of each field at this position are shown. You can also select which columns should be shown from the Visible Columns pull-down menu.
If a voxel is mistakenly selected, hold CTRL and click again on that voxel to deselect it. Clicking Clear Selection in the Voxel Selection dialog removes all voxels from the selection.
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Component Modes
After selecting one or more voxels, edit them by selecting one of the Component Mode commands and clicking Run. All these operations can be undone by clicking the 
icon in the toolbar or with CTRL+Z.
Flood-Fill Component
Fill the selected voxels and the components connected to them with a New Material ID chosen from the pull-down menu.
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Flood-Fill Component Plane
Fill the selected voxels and the components connected to them with a New Material ID only in the Plane chosen from the pull-down menu (X-Y Plane, X-Z Plane, or Y-Z Plane).
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Reassign Material of Objects (*.g32)
If a *.g32 file with object indices is loaded in the GeoDict GUI (e.g., created by right clicking on GAD Objects in the Project Status Section and selecting Create GAD Index Image), the Object ID is additionally shown for each voxel selected. Select a New Material ID and click Run, to assign the new material to all voxels that belong to the same Object ID as the voxels selected (here Object IDs 78, 109 and 128).
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Reassign Material of Selected Voxels
The Material ID of the selected voxels can be changed by selecting a New Material ID from the pull-down menu.
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Dilate Selected Voxels
It is possible to dilate the voxels by coating them with another material chosen from the Coating Material ID pull-down menu by a certain number of voxels (Dilate by). By checking Only Reassign ID, only voxels of the selected Material ID will be changed to the Coating Material ID.
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Dilate Component
Also possible is to dilate the selected voxels and the components connected to them with the Coating Material ID by a certain number of voxels (Dilate by).
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Dilate Component Plane
Dilate the selected voxels and the components connected to them only in the Plane chosen from the pull-down menu (X-Y Plane, X-Z Plane, or Y-Z Plane) with the Coating Material ID by a certain number of voxels (Dilate by).
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Line Plot for Geometry & Fields
Select exactly two voxels to create a line plot which will gather information on the structure along the straight line between the two selected points. After entering a Result File Name, click on Create Plot. Then, the Result Viewer opens and shows in the Report tab the start and end point of the line in X-, Y- and Z-coordinates as well as the length of the line. For each loaded volume field the minimal, maximal and mean value on the line is stated. In the Plots tab, the Material IDs along the line are plotted over the distance from the starting point in the Voxel Geometry subtab. Each volume field has its own subtab with a plot of the field values on the line over the distance.
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