msi2lmp V3.6 4/10/2005

This program uses the .car and .mdf files from MSI/Biosyms's INSIGHT program to produce a LAMMPS data file.

1. Building msi2lmp3
   
   Use the Makefile in the src directory. It is currently set up for gcc. One will have to modify it to use a different compiler.
2. Testing the program
   
   There are three pairs (.car and .mdf) files in the test directory: crambin, nylon and phen3_cff97. The atom types in crambin and nylon are cvff (Class I) atom types and those in phen3_cff97 are cff9x (Class II) atom types. Two forcefield files, cvff.frc and cff91.frc, are needed generate lammps data files for these three test files. To run it you would:
   
   % setenv BIOSYM_LIBRARY ../biosym_frc_files % ../src/msi2lmp.exe nylon -class I -frc cvff > data.nylon % ../src/msi2lmp.exe crambin -class I -frc cvff > data.crambin % ../src/msi2lmp.exe phen3_cff97 -class II -frc cff91 > data.phen3_cff97
   
   Three files should be generated: data.nylon, data.crambin and data.phen3_cff97. These can be compared against data.x in the directory correct. If there are differences, first recompile the program with no optimization and try again. If there are still differences, send email to jec@mayo.edu
   
   Note: you will see many "Unable to find..." parameters messages in the phen3_cff97 test case. Most of those parameters exist in cff95.frc, but not in cff91.frc
3. To run the program
   
   The program is started by supplying information at the command prompt according to the usage described below.
   
   USAGE: msi2lmp.exe ROOTNAME {-2001} {-print #} {-class #} {-frc FRC_FILE}
   • msi2lmp.exe is the name of the executable
   • ROOTNAME is the base name of the .car and .mdf files
   • -2001 Output lammps files for LAMMPS version 2001 (F90 version) The default is for LAMMPS 2005 (C++ version)
   • -print
   • is the print level 0 - silent except for error messages

	                       1 - minimal (default)
                               2 - verbose (usual for developing and
                                   checking new data files for consistency)
   -- -class 
         # is the class of forcefield to use (I  = Class I e.g., CVFF)
		  			     (II = Class II e.g., CFFx )
      default is -class I

   -- -frc   - specifies name of the forcefield file (e.g., cff91)
 
     If the name includes a hard wired directory (i.e., if the name
     starts with . or /), then the name is used alone. Otherwise,
     the program looks for the forcefield file in $BIOSYM_LIBRARY.
     If $BIOSYM_LIBRARY is not set, then the current directory is 
     used.

     If the file name does not include a dot after the first
     character, then .frc is appended to the name.

     For example,  -frc cvff (assumes cvff.frc is in $BIOSYM_LIBRARY
                              or .)

                   -frc cff/cff91 (assumes cff91.frc is in 
                                   $BIOSYM_LIBRARY/cff or ./cff)

                   -frc /usr/local/biosym/forcefields/cff95 (absolute
                                                             location)

     By default, the program uses $BIOSYM_LIBRARY/cvff.frc

  -- the LAMMPS data file is written to ROOTNAME.lammps{01/05}
     commentary is written to standard error.

• Msi2lmp3 *
• This is the third version of a program that generates a LAMMPS
• data file based on the information in MSI .car (atom
• coordinates), .mdf (molecular topology) and .frc (forcefield)
• files. The .car and .mdf files are specific to a molecular
• system while the .frc file is specific to a forcefield version.
• The only coherency needed between .frc and .car/.mdf files are
• the atom types. *
• The first version was written by Steve Lustig at Dupont, but
• required using Discover to derive internal coordinates and
• forcefield parameters *
• The second version was written by Michael Peachey while an
• intern in the Cray Chemistry Applications Group managed
• by John Carpenter. This version derived internal coordinates
• from the mdf file and looked up parameters in the frc file
• thus eliminating the need for Discover. *
• The third version was written by John Carpenter to optimize
• the performance of the program for large molecular systems
• (the original code for deriving atom numbers was quadratic in time)
• and to make the program fully dynamic. The second version used
• fixed dimension arrays for the internal coordinates. *
• The current maintainer is only reluctantly doing so because John Mayo no longer
• needs this code. *
• V3.2 corresponds to adding code to MakeLists.c to gracefully deal with
• systems that may only be molecules of 1 to 3 atoms. In V3.1, the values
• for number_of_dihedrals, etc. could be unpredictable in these systems. *
• V3.3 was generated in response to a strange error reading a MDF file generated by
• Accelys' Materials Studio GUI. Simply rewriting the input part of ReadMdfFile.c
• seems to have fixed the problem. *
• V3.4 and V3.5 are minor upgrades to fix bugs associated mostly with .car and .mdf files
• written by Accelys' Materials Studio GUI. *
• V3.6 outputs to LAMMPS 2005 (C++ version). *
• Contact: Kelly L. Anderson, kelly.anderson@cantab.net
• April 2005