Brush Modes
The Brush Mode defines how the chosen Material ID will interact with the Material IDs existent in the structure.
To better observe material intersections, the GeoDict built-in red-green-yellow-blue color scheme is used for the next example.
This color scheme is obtained by selecting Settings → Color & Visibility Settings… and clicking the 
icon at the bottom of the dialog (Load built-in default settings).
To show the behavior of different brush modes, two slabs were created with 5x20x5 voxels each. The painting is done in the X-Y-plane on slice 12.
Set mode
In Set mode, all original Material IDs are set to the chosen Material ID. The replacement of material is clearly seen in 3D rendering.
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Add mode
In Add mode, the selected Material ID does not replace the original Material ID of the painted voxels, but an intersecting material is built. The new Material ID is determined by bitwise adding the paint Material ID to the Material ID of the painted voxels.
According to GeoDict’s rules on defining new Material IDs for intersecting materials, adding voxels of Material ID 04 (blue) to Material ID 01 (red) results in intersected voxels of Material ID 05 (violet-colored). Material ID 04 added to Material ID 02 (green) results in intersected voxels of Material ID 06 (cyan-colored). And Material ID 04 added to Material ID 00 (porous space) results in Material ID 04. The intersecting materials are also shown below in 3D rendering.
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Subtract mode
In Subtract mode, the selected Material ID is bit-wise subtracted from the existing structure where the brush is applied, again according to GeoDict’s rules on defining new Material IDs for intersecting materials.
Thus, voxel of Material ID 01 subtracted from voxels of Material ID 01 or Material ID 00 results in Material ID 00. For voxels of Material ID 02 subtracting Material ID 01 does not change the Material ID.
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Replace mode
In Replace mode, the selected Material ID replaces only voxels of the Replace ID. Other Material IDs are unaffected by the modification. With the settings shown, only voxel of Material ID 01 replaced by Material ID 04.
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