write_isurf group-ID Nx Ny Nz filename ablateID keyword args ...
precision arg = int or double
write_isurf block 100 100 200 isurf.material.* ablation
Write a grid corner point file in binary format describing the current corner point values which define the current set of implicit surface elements. See the read_isurf command for a definition of implicit surface elements and how they are defined from grid conner point values. The surface file can be used for later input to a new simulation or for post-processing and visualization.
The specified group-ID is the name of a grid cell group, as defined by the group grid command, which contains a set of grid cells, all of which are the same size, and which comprise a contiguous 3d array, with specified extent Nx by Ny by Nz. These should be the same parameters that were used by the read_isurf command, when the original grid corner point values were read in and used to define a set of implicit surface elements. For 2d simulations, Nz must be specified as 1, and the group must comprise a 2d array of cells that is Nx by Ny. These are the grid cells that contain implicit surfaces.
Similar to dump files, the filename can contain a "*" wildcard character. The "*" character is replaced with the current timestep value. For example isurf.material.0 or isurf.material.100000.
The specified ablateID is the fix ID of a fix ablate command which has been previously specified in the input script for use with the read_isurf command and (optionally) to perform ablation during a simulation. It stores the grid corner point values for each grid cell.
The output file is written in the same binary format as the read_isurf command reads in.
The optional keyword default is precision double.