A c# program to convert Crytek files to .obj and Collada formats
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Heffay Presents

Cryengine Converter

Cryengine Converter is a C# program to help convert Cryengine assets into a more portable format. Currently it supports .obj and .dae (Collada) to some extent, although work is in progress to allow exporting Cryengine assets into FBX format. The default output is Collada, as this supports the most features, including Armature/rigs with vertex weights and better material handling.

How do you use it? Well, here is the output from the current Usage:

PS D:\scripts> cgf-converter

cgf-converter [-usage] | <.cgf file> [-outputfile <output file>] [-objectdir <ObjectDir>] [-obj] [-blend] [-dae] [-smoot
h] [-throw]

-usage:           Prints out the usage statement

<.cgf file>:      Mandatory.  The name of the .cgf, .cga or .skin file to process
-outputfile:      The name of the file to write the output.  Default is [root].obj
-noconflict:      Use non-conflicting naming scheme (<cgf File>_out.obj)
-allowconflict:   Allows conflicts in .mtl file name
-objectdir:       The name where the base Objects directory is located.  Used to read mtl file
                  Defaults to current directory.
-obj:             Export Wavefront format files (Default: true)
-blend:           Export Blender format files (Not Implemented)
-dae:             Export Collada format files
-fbx:             Export FBX format files (Not Implemented)
-smooth:          Smooth Faces
-group:           Group meshes into single model

-throw:           Throw Exceptions to installed debugger

Ok, so how do you actually USE it?

I'm going to assume you've already taken a Cryengine based game (Mechwarrior Online, Star Citizen, etc) and extracted the .pak files into a directory structure that essentially mimics a Cryengine ... layout? Sure, let's say layout.

PS D:\Blender Projects\Star Citizen> dir

    Directory: D:\Blender Projects\Star Citizen

Mode                LastWriteTime         Length Name
----                -------------         ------ ----
d-----        5/20/2017   7:59 AM                Animations
d-----        5/20/2017   7:59 AM                Entities
d-----        5/20/2017   7:59 AM                Levels
d-----        5/20/2017   8:00 AM                Libs
d-----        5/20/2017   7:59 AM                Materials
d-----        5/20/2017   8:43 AM                Objects
d-----        5/20/2017   8:00 AM                Prefabs
d-----        5/20/2017   8:00 AM                Scripts
d-----        5/20/2017   8:54 AM                Sounds
d-----        5/20/2017   9:04 AM                Textures
d-----        5/20/2017   9:05 AM                UI

This is pretty close to what a game like Star Citizen will look like after you extract all the .pak files, using a utility like 7zip. The important directories here are Objects (generally contains the .cga/.cgam/.cgf/.skin files) and the Textures directory. You generally don't need to worry about the directory structure unless you're using my asset-importer.ps1 or mech-importer.ps1 script, but let's just call this the root directory for Cryengine assets.

Aside: When compiled (or you just download the .exe), this program is easiest to use when you put it into a dedicated directory that is in the path. I won't go into how to modify the path on your computer, but I have my own d:\scripts directory with cgf-converter.exe in it, along with a few other commonly used scripts and programs. I recommend you do the same (or something similar), as from now on the Powershell commands I type out will assume that the programs are in the path. If they aren't, the commands I list will not work.

Aside 2.0: Be careful exporting stuff to .obj files, which is currently the default method. A Cryengine file (in incredibly simplified terms) consists of a geometry file (ends in .cga/.cgaf/.cgam) and the related material file (ends in .mtl). The Cryengine material file is an XML file that contains material info. This program will take that file and convert it by default to an .obj material file with the same name, which is not ideal. Use the -noconflict argument to make it write to a similar name that won't conflict.

** Important:** Always use the -objectdir argument! The location of the material files is dependent on a number of factors, and the program does its best to find them. However, if it can't find the proper material file for the object you're trying to convert, it will fail to run. -objectdir helps reduce that risk significantly.

Tutorial Video:

  • Coming soon!

Conversion Instructions

Collada (-dae)

Collada format (v1.4.1) may be a better option for most game assets. On top of having cleaner geometry, the material file is included into the Collada (.dae) file, so you only have one file to worry about (so no need to use -noconflict). In addition, if there is an armature, Collada files can also contain all that information as well.

To convert a single .cga/.cgf/.skin/.chr file to a .dae file, using Powershell:

PS D:\Blender Projects\Star Citizen\Objects\Spaceships.ships\AEGS\gladius\>cgf-converter AEGS_Gladius.cga -objectdir <insert the directory to the Object dir>

You can replace the -dae with -collada as well.

Waveform (-obj. Avoid using this unless you absolutely have to.)

To convert a single .cga/.cgf/.skin file to an .obj file, using Powershell:

PS D:\Blender Projects\Star Citizen\Objects\Spaceships.ships\AEGS\gladius\>cgf-converter AEGS_Gladius.cga -obj

This will create a couple of files in that directory:

  • AEGS_Gladius.obj
  • AEGS_Gladius.mtl

Since the Cryengine .mtl file has a good chance of being in that directory, it will overwrite it unless you use the -noconflict argument.

PS D:\Blender Projects\Star Citizen\Objects\Spaceships.ships\AEGS\gladius\>cgf-converter -noconflict AEGS_Gladius.cga

Instead of an AEGS_Gladius.mtl file, it will create an AEGS_Gladius_mtl.mtl file, and leave the original .mtl file as is.

There are occasions where you may want to overwrite the file, but generally you are going to want to use the -noconflict argument.

Bulk Conversion

If you want to convert all the files in a directory, you can provide a wildcard for the file name:

cgf-converter *.cga -objectdir <insert the directory to the Object dir>

This will take every file in the directory where the command is being run and convert it to Collada format.

If you want to convert all the files in a directory as well as all the directories below it, you can use the -recurse option to make it traverse:

foreach ($file in (get-childitem -recurse *.cga,*.cgf,*.chr,*.skin)) { cgf-converter $file -objectdir <insert the directory to the Object dir> }

NOTE: If you run this on the Objects directory, it will convert EVERY file in the game. This can take a very long time, and takes a lot of disk space. Be careful using the command like this.

Finally, the converter does support being run through the Windows Explorer, so you can just drag a .cga file or files onto cgf-converter.exe and it'll do a default conversion (to .dae). This isn't ideal, but it is the quick and dirty way if you are morally opposed to using a prompt. 👍

Questions? Feel free to contact me and I'll be happy to provide some additional help.