The voltool utility provides a tool to manipulate volumes within a grid.
 

-igrid [file_name]

Specifies the input grid file name

-ogrid [file_name]

Specifies the output grid file name

-volid [#]

Specifies the volumes(s) to manipulate.  Multiple volumes are specified using a comma delimted list that may contain a - (dash) for consecutive ids.  For example, to specify volumes 2, 3 4 5, 7, 9, 10, and 11: -volid 2-5,7,9-11

-extract

Write the specified volumes(s) to the output grid file.  (where the volume id was specified per node)

-extractelem

Write the specified volumes(s) to the output grid file.  (where the volume id was specified per element)

-assign

Assigns a volume id to all nodes between the surfaces specified using -surfid1 and -surfid2.

-assignelem

Assigns a volume id to all elements between the surfaces specified using -surfid1 and -surfid2.

-surfid1 [#]

Specifies the surface to march from when assigning volume tags.  Multiple surfaces may be specified using a comma delimted list that may contain a - (dash) for consecutive ids.

-surfid2 [#]

Specifies the surface to march towards when assigning volume tags.  If surfid2 < 0, the nodes on surfid2 will not be assigned a new volume tag.  Multiple surfaces may be specified using a comma delimted list that may contain a - (dash) for consecutive ids.

-auto

If used with -assignelem, automatically assigns a volume id to all elements based on the number of sub-volumes formed by closed interior surfaces.  If used with -extract or -extractelem, automatically extracts each volume id found in the grid and and writes each sub-volume to a separate grid file.

-interior

Include interior surfaces when extracting volumes.

-skipboundarycheck

Skip boundary face connectivity check after extraction.

-help

Prints the help screen.

-version

Prints the version information of the executable and the associated libraries

-build

Prints the build number of the executable