Invert Mask
This option reverses the current mask on a grid.
On the Model menu, point to Grid Mesh Surfaces, then click Invert Mask.
Invert Options
Shared Edges
This option will create a border in which the grid cells between the masked and unmasked area are in contact with each other. The two zone will touch each other.
Mutually Exclusive
This option will create a border in which the grid cells between the masked and unmasked area have a buffer zone between them. The two zones do not touch each other.
Grid Selection
Browse for files using the Browse button, or use the interface showing the available grid files in the current working directory.
Click on the name of the file(s) you want to select. Use the 
icons to go to the last folder visited, go up one level, or change the way details are viewed in the window.
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To highlight multiple files that are adjacent to each other in the list, hold down the Shift key and click the first and last file names in that section of the list.
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To highlight multiple non-adjacent files, hold down the Ctrl key while you click the file names.
Move the files to the selection list on the right side of the panel.
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Click the -> button to move the highlighted files to the selection list on the right.
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Click the >>
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button to move all the files to the selection list on the right.
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Click the <- button to remove a highlighted file from the selection list.
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Click the << button to remove all files from the selection list.
Wildcard
Enter any characters used as wildcards. Wildcard characters can be an * as well as regular characters. For example, if the topo* were used as a wildcard, the result would be:
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topo_regional.00g
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topo_no_pit.00g
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topo_pit.00g
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topo_dump.00g
Save grid(s) to folder
Use this option to save the resulting masked grid to a specified folder.
Overwrite existing file(s)
Select this option to overwrite any existing files with the same name.
Note: If a file of the same name already exists in the destination folder and you have not given permission for it to be overwritten, a new mask grid will not be generated.
