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  1. Hey everyone, this is a slightly updated version of a program that I wrote to assist in adding built-in maps and game variants to Halo: Reach or Halo 4's main menu. This program will extract the raw MVAR or MPVR data and their headers, so all you'll have to do is actually inject that data to the main menu and go from there. As there is no 100% accurate way (as far as I can tell) to determine the end of the header info from either MVAR or MPVR, that is not guaranteed to be accurate. The program sort of guesses where the end of the header is (Everything I tested worked, but it may not work with some of your files). Use your sense and take a look at the original tutorials if you're in doubt. If anyone does know of a completely, or at least more accurate way to determine the end of those headers, please let me know and I'll work it into the code as soon as possible. (I had to change the name of the source files to VariantExtractor because GitHub doesn't like spaces) Source Download Original Post:
  2. Adding built-in game variants is something that I've always wanted to do since I saw Zedd's post on replacing built-in maps. I recently figured out how to do it so I figured I'd share with the community. The process is very similar to replacing or adding built-in map variants, with a few small changes. For my example, I'll be using Gun Game. What You'll Need A copy of mainmenu.map"variant" file extracted from your gametypeHex Editor (You can grab HxD free here if you don't have one.)NotepadAssemblyHex calculator (Alt+3 on Windows Calculator!)Step One: Getting the Data from MPVR Open the variant file in your hex editor. Scroll down until you find the string "mpvr". From this point, move ahead 0x24 bytes, and we'll find the size we need to copy. Move your caret right past the value that tells us the size (at 0x28 from mpvr), and copy the size you just got. Paste this into Notepad. To keep things less confusing, I like to delete all spaces. To do this, you can press ctrl+H (replace), and put a space in "Find" and keep "Replace" blank, and press "Replace All". You should see something like this: Now, in order to get this to the format the main menu will take as a built in, we have to make a small modification. Delete the "2" at the beginning of the file, and add a "0" to the end. Now, copy this data, and paste it into a new document in your hex editor. Save it. Now we need to get the raw header. Jump to 0x8 in this new file. It should start with something like "700007F2". We need to copy to the end of what the description is, but it's not plain text in this format, so we'll have to go about different means to do that. So, there should be a pattern here, generally a 0x00 or 0x01 every other byte. This is the name and description in this area. At the end of this "pattern", there will be two 0x00 bytes, followed by a break in the pattern. So, we need to copy from 0x8 bytes from the file's start, to the byte after the two 0x00 bytes. Paste this in a new document. In this new document, subtract 0x02 from the last byte. Save. Step Two: Adding the Entry Expand the map, move the "Megalo" reflexive in VTGL, and add a chunk so you can reference your new built-in gametype. To make it easier, I copied the data from the last chunk to my new chunk. I'm not going to go over that in this tutorial. There is plenty information out there, I'd begin looking here or here if you're not sure, or you can ask in the comments. Anyways, copy and paste the raw header and the raw mpvr into the free space you have in your file, making sure there is enough space between the end of the reflexive data and where you paste this data. Make note of the offsets you pasted these to, and add the tag address mask (map magic) so we can reference this offset. Also, note the sizes of your header and raw files. In the chunk we added to the "Megalo" reflexive in VTGL, we're now going to reference these values. So right click "Raw Header", and choose "View Value As". Copy the Meta Offset and go to that offset in your hex editor. Here, you'll see: Size of MPVR Header data Offset of MPVR Header data Size of Raw MPVR data Offset of Raw MPVR data Edit these values to reflect the size and memory offset of the data you pasted. Save. Open back up in Assembly to make sure everything looks good. You can also change the filename in Assembly too, if you wish. If everything worked correctly, you should have your new built-in gametype after you transfer the map to your xbox. Congratulations! I hope you were successful in your attempts with this. When I was writing this tut, and all was done, I found the game crashed when I tried to open the gametype selection in-game. It turned out the gametype I was using at first was corrupt, so it's a good idea to double check before you start. This can also be done in Halo: Reach; it's practically the exact same process. In the next update for my Main Menu mod for Reach, I will have more built-in gametypes added. Thanks Lord Zedd for the tutorial on changing built-in map variants The Assembly team for making the best Halo modding tool out there Of course, if you find any issues or need clarification, please don't hesitate to comment or PM me.