---
name: "gmx-genconf"
section: "1"
platform: "linux"
package: "gromacs-data"
version: "2025.2-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/gmx-genconf"
---

# gmx-genconf(1)

Multiply a conformation in 'random' orientations

## NAME

gmx-genconf - Multiply a conformation in 'random' orientations

## SYNOPSIS

```
gmx genconf [-f [<.gro/.g96/...>]] [-trj [<.xtc/.trr/...>]]
            [-o [<.gro/.g96/...>]] [-nbox <vector>] [-dist <vector>]
            [-seed <int>] [-[no]rot] [-maxrot <vector>]
            [-[no]renumber]
```

## DESCRIPTION

**gmx genconf** multiplies a given coordinate file by simply stacking them on top of each other, like a small child playing with wooden blocks. The program makes a grid of *user-defined* proportions (**-nbox**), and interspaces the grid point with an extra space **-dist**.

When option **-rot** is used the program does not check for overlap between molecules on grid points. It is recommended to make the box in the input file at least as big as the coordinates + van der Waals radius.

If the optional trajectory file is given, conformations are not generated, but read from this file and translated appropriately to build the grid.

## OPTIONS

Options to specify input files:

- **-f \[\<.gro/.g96/...\>\] (conf.gro)**

  Structure file: *gro* *g96* *pdb* brk ent esp *tpr*

- **-trj \[\<.xtc/.trr/...\>\] (traj.xtc) (Optional)**

  Trajectory: *xtc* *trr* *cpt* *gro* *g96* *pdb* *tng*

Options to specify output files:

- **-o \[\<.gro/.g96/...\>\] (out.gro)**

  Structure file: *gro* *g96* *pdb* brk ent esp

Other options:

- **-nbox \<vector\> (1 1 1)**

  Number of boxes

- **-dist \<vector\> (0 0 0)**

  Distance between boxes

- **-seed \<int\> (0)**

  Random generator seed (0 means generate)

- **-\[no\]rot (no)**

  Randomly rotate conformations

- **-maxrot \<vector\> (180 180 180)**

  Maximum random rotation

- **-\[no\]renumber (yes)**

  Renumber residues

## KNOWN ISSUES

- •

  The program should allow for random displacement of lattice points.

## SEE ALSO

**[gmx(1)](/gmx/1.md)**

More information about GROMACS is available at \<*http://www.gromacs.org/*\>.

## COPYRIGHT

2025, GROMACS development team