The Paint Mode editing works in a way similar to the Windows standard editor Paint. Editing is always done in 2D (View → 2D Cross-Section (SEM)) and the effects can be seen later in 2D as well as in 3D (View → 3D Rendering).

The Paint Mode places GAD Objects with the shape chosen in Brush Mode into the structure. After painting, these GAD objects can be modified, e.g. as shown here. Thus, using the paint mode on a structure with analytic object information changes the analytic data. After editing in the paint mode, the changed structure must be saved to store the modifications.

As an example, a fibrous media model is edited with Paint Mode.

Use the Paint mode as follows:

1. Select View → 2D Cross-Section (SEM) in the menu bar or click the icon in the toolbar. In the Visualization panel, above the Visualization area, click the Camera (Y, Z) tab and use the Direction pull-down menu and the Slice slider to navigate to the location where the editing should take place. Here, direction Z and slice 90 is selected.

2. Activate the Paint mouse mode with the icon from the toolbar, which also opens the Paint tab on the GUI Sidebar.
3. In the opening Paint Settings dialog, editing is done using the cursor as a brush. The shape of the brush is set in the Brush Shape pull-down menu and the size in the Brush Length (Diameter) X, Brush Length (Diameter) Y and Brush Length (Diameter) Z boxes. The brush size is given in voxels.

1. 1. The brush shape can be a Box, with the side lengths entered in Brush Length X, Y, and Z, or a Sphere / Ellipsoid with the diameters entered in Brush Diameter X, Y, and Z. The shape and size of the brush will be the shape and size of the GAD objects that you paint in the structure.
   2. The Material ID of the material to draw with is chosen from the Material ID pull-down menu.
   3. The choice of Brush Mode in the pull-down menu determines the working technique for the brush. With Set, the original Material ID of the painted voxels is replaced by the selected Material ID. With Add and Subtract, the chosen Material ID is bit-wise added to or subtracted from the original Material ID. Use Replace, to select a Replace ID. Only the Replace ID is changed to the new Material ID.
   4. The Draw Mode defines whether the brush stroke is applied for Continuous drawing, for a Single Click or for drawing a Straight Line.

4. The brush strokes, in the selected shape, size, and Material ID (here Sphere (Ellipsoid), diameter 5 x 5 x 10 voxels, Material ID 03), are applied by pressing and moving (for Continuous Drawing and Drawing Straight Lines) and by clicking (for Single Click Drawing) with the left mouse button in the desired position.