Custom Character Tutorial

Introduction
-tarsa129
 * Help for specific issues that you may experience should be asked in the Double Crew server.
 * It is highly recommended that you read all relevant readme files and documentations, as well as look to see what vanilla does, before asking (potentially annoying) questions. This guide will assume that you have read all the relevant material, unless it is especially noteworthy, because I do not wish to copy words that are perfectly written elsewhere.
 * If there is no source of the information listed, then you can assume that I came up with it myself.

Still in progress!!!

Breaking open the .iso:
You need to break open the .iso in order to access / modify the character files. See the page on breaking open an .iso for detailed information.

Breaking open MRAM.arc:
Most of the edits will take place in MRAM.arc. See Extracting and Packing ARC Files for information on how to extract and pack files for MRAM.arc.

Folders in MRAM.arc (that are relevant to characters):
 * driver:
 * Each character has their own folder for their driver.bmd and facial animations.
 * There are also “common” folders for common animations among similar characters.
 * The character model is driver.bmd. The .btp files are facial animations.
 * kart
 * Each character has their own folder for their kart + the parade kart
 * Contains models for the body, left and right wheels, and under-body parts.
 * item
 * Contains models for all items, including special items
 * setting
 * Contains setting files for each kart
 * shadow
 * Contains shadow models / animations for all karts
 * CURRENTLY CANNOT BE EDITED
 * MRAM.arc/race2d.arc|race2d.arc
 * Contains various images like:
 * Character select screen image
 * Character minimap icon
 * Icons for the kart / special items
 * Can be opened in the same way as MRAM.arc

A Note about File Size:
There are two ways in which a character model that is too large can crash the game: Both can causes game crashes, and should be avoided. As a general rule, your custom character should be around or below the vanilla character's size.
 * The file itself is too large ( > 90 kb)
 * MRAM.arc is too large

= Editing Characters =

Getting the Vanilla Model:
Getting the vanilla model is important for the vanilla character's rig and material / texture data. These can be obtained using the vanilla driver.bmd file and SuperBMD. Basing your import off the vanilla model (rig and material-wise) is the easiest way to get your character working in-game. See the SuperBMD tutorial for information.

If you are using Blender, when the .dae output of SuperBMD might not work for you. In this case, you can use blemd to import the vanilla model into the game. However, you still need to convert the vanilla character model using SuperBMD so that you have the material and texture data.

Getting a model from another source: Your new model can be from a variety of sources, but getting it is up to you. If you want to use pre-made models, you can look at Models Resource or you could get one from the files of another game.

Making a model:  If you wish to make your own model, look at some of the tips described in the next section.

CAD Software / Pre-Conversion Instructions
Tools Needed: 3dsMax/Blender, Image editing software

Meshes:
Making a character model is a highly subjective practice, so it is impossible to give instructions. However, tips can be given.
 * Try to keep the model to under roughly 700 faces, in order to keep file size down. If you got a model from another source and it is too high poly, you must optimize / decimate the model.
 * If you are making a character by hand, Using the vanilla mesh for the arms can help the animations look better, and it saves time for you.
 * Unless you can or are willing to edit bone animations, you should try to sculpt your model around the vanilla model. (Hint: you don't want to edit bone animations). Getting the vanilla rig is described above.
 * Your normals should be unified / averaged across your model unless you are trying to achieve a particular effect.

Bones/Rigging:
To get the vanilla bones to use in rigging:
 * 1) Import the character into your software via the steps above.
 * 2) Delete the meshes that come with the import.
 * 3) Import the mesh that you want to use.

Rigging Tips:
 * (If using 3dsmax) Add all the bones to the skin except skeleton root
 * There should be no vertices attached to charactername_all, or any of the hand/feet pose bones
 * Not all other bones have to have vertices weighted for them.
 * When in doubt, refer back to vanilla (especially if you are not going to edit any bone animations)
 * It is okay to have both face and body in one mesh, as long as they have different materials.
 * A face-only mesh should only have the face bone attached (in 3dsmax skin modifier)
 * While the game will not crash if you have multiple bones weighted to one vertex, doing so may increase the file size.
 * In 3dsmax, when you export, you should not get any popup about incorrect bone binding matrices.

Materials:
The body and the face should have different materials (if the vanilla model has two different materials), but they can be part of the same mesh. The material names (don’t worry about textures or meshes mesh names) of the body/face on your model should match those of the vanilla model. If not, the game might crash. Usually the body name is: characterfoldername_all_tx And the eye name is: characterfoldername_eye_tx But you should check for the specific character that you are replacing.

While knowledge of how the material settings affect how a character will look, it is beyond the scope of custom characters. The only changes that one should be doing to material .json files for custom characters (in the vast majority of cases) is editing texture names and cull mode.

Textures:
The texture names, for your convenience later, should also match the vanilla names, but changing them will not cause a game crash. If you do change the texture names, you must edit the material and texture .json files to match.

The texheader .json file: The texheader files is used to specify all the images in the .bmd. It is compmosed of an array of texheaders, which each define a texture. This allows characters to have facial expressions. Many texheader settings can be changed in J3dView, but it is easier to change them in the .json file so that you do not have to reedit them after each conversion. is a basic list of texheader settings. Here is a list of relevant texheader settings for characters:
 * Format: None of your textures should be in the RGB5A3 format. This will take up too much filespace and cause the game to crash. Use CMPR or a grayscale format instead.
 * WrapS / WrapT - basically WrapU / WrapV
 * Define how UVs should act when a meshes UV's put them outside of the texture.
 * S is for U, and T is for V
 * "Clamp" will put the UVS at the closest edge of the texture, "Repeat" will cause the texture to be repeated over all UV space, and "Mirror" will cause the texture to be mirrored over all UV space.

If you are using Mipmaps for a texture, you need to set: All textures (except for the highlight texture) for vanilla characters in this game have mipmaps.
 * MipMap: 1 (instead of 0)
 * MinFilter: “LinearMipmapLinear” (instead of Linear)
 * MaxLOD: # of mipmaps (instead of 0)

For Faces:
 * Make sure that you have vanilla number of facial textures (usually 6). If you do not plan on editing the .btps, it would be wise to try to match the expressions.
 * If you have less than the vanilla number of facial textures, you will have to edit the texheader.json file. Basically, just copy the texture data for a texture that you do have one texture over the textures you do not have. Doing so will not increase the file size, but will save you time in editing the .btp files.
 * If one edits the .btps, it is possible to change the number of facial textures needed, but this can be tedious.
 * In the cadding software itself, you only need to load the first eye texture (the one with a 0 in its name)

 Shading:  In order to get the vanilla shading, you must use the vanilla material .json file in conversion (explained later). This material uses the highlight texture, which is an output of the .bmd -> .dae process. If your normals are good, your shading still might be off. The best you can do is adjust normals and pray.

Using SuperBMD / Conversion Instructions
Here is an in-depth article on how to use SuperBMD. Some of the more basic points are reiterated here. Once you are done with your model, export as a .dae or .fbx using SuperBMD. Exporting as a .obj will not save the rigging data. When conversion to .bmd, the driver_materials.bmd and tex_headers.json files must also be parsed for good results in game.

To use SuperBMD: This process can also be done using the command line, but that can be more tedious, and offers no benefit over a .bat file.
 * 1) Create a new .bat file, and put the following text in it: SuperBMD.exe (inputfilepath) (outputfilepath) --mat (materialfilepath) --texheader (texheaderfilepath)
 * 2) Replace the words in  to the correct file names.
 * 3) Run the .bat file, and a .bmd file with the name as the outputfilepath (if specified, inputfilepath.bmd if not) will be created.

J3dView:
After the new driver.bmd file is created, you may want to check on its textures and materials if you did not do that before conversion. Open J3dView and open your new .bmd file. If the textures look strange, try editing the texture settings in J3View, and then when you are happy, applying the changes to the texheader .json file.

J3dView is also great for seeing how character select screen animations will look like before putting them in-game. To load a character select animation (located in the character specific folder in Filesystem/SceneData/selectAnm.arc), go to File -> Load Animation -> Select animation. .bck files with a different number of bones than the model will not load in this program, but will load in-game. In-game, this animation will run twice as fast because it is being shown at 30fps, while Double Dash runs at 60 fps.

Additionally, character facial animations can be viewed. To load a facial animation (located in character-specific folder in Filesystem/MRAM.arc/driver), go to File -> Load Animation -> select the .btp. Viewing them in this method is a lot easier than viewing them in-game, because testing in-game will require actually triggering them in-game. However, viewing them in J3dView takes the animations out of context - one would not want a happy animation when the character is burning, for example.

J3dView does not open vanilla character files, but will open modded ones due to the unique way in which vertex data is stored.

 Testing:  Be sure to test in all game modes: Time trials, Grand Prix, and 2-player. Some models (those with incorrect material names), will work in time trial mode, but not in grand prix mode. A character that works in the character select screen is not guaranteed to work in-game. This also helps you see if the animations look okay with your model.

Necessary Images
All necessary images for characters are .bti files. Your character mod is not complete without these files.

Character names: 
 * Kept in Filesystem/SceneData/English/menu.arc/timg
 * Dimensions: 156 x 32
 * Tool: MKDD Text Maker
 * Make the vertical scaling 75%, and the horizontal scaling at most 75%.

 Character selection icon:
 * Kept in Filesystem/MRAM.arc/race2d.arc/timg
 * Dimensions: 64 x 64
 * Try to match the vanilla angle, and the image should not have an outline.

 Minimap icon: 
 * Kept in Filesystem/MRAM.arc/race2d.arc/timg
 * Dimensions: 32x32
 * Basically a straight on headshot on the character. Should have a 2px gray outline.

 Image Conversion / How to use wimgt:  See Converting Images for information.

Custom Voices:
Custom voices can really deepen the immersion of a custom character - no one wants Baby Peach calling herself "Baby Mario." The tool for editing character voices is pinned in #other-formats in the Double Crew server. To use it:
 * 1) Inside Filesystem/AudioRes, extract the program and run "initialize.bat", which will create a folder called "Audio_Modding", where you will do the edits.
 * 2) Inside the Audio_Modding folder, there will be separate folders for each .aw file.
 * 3) Inside each of these folders, there are folders for the vanilla sound clips ("wav") and for the custom sound clips ("custom")
 * 4) To replace a vanilla sound clip, put a .wav of the same name in the "custom" folder.
 * 5) When you are done, run "rebuild_all.bat" in AudioRes.

Concerns regarding custom voices: While custom voices complete a custom character, and allow for immersion, there are some concerns about their release. However, editing these custom voice clips would replace all of the .aw files as well as the GCKart.baa file. This means that for multiple characters to have custom voices, a specific pack for just those characters has to be compiled and released. Additionally, the fact that it overwrites the .baa file means that the release with the character voices must be the first mod packed into a game on its own patch, and then everything else can be added.

 Editing the .btp Files:  .btp files are texture swapping animations that animate facial expressions on characters. Character facial animations are found in the character-specific folder in Filesystem/MRAM.arc/driver. Additionally, there is a gut.btp found in the character-specific folder in Filesystem/SceneData/selectAnm.arc. This is the animation that plays alongside character confirmation. In character selection / character waiting, the texture in Frame 0 of this animation is used.

Use BTPxT to convert each .btp file into a .txt file. The number for each frame corresponds to the image of a texture as specified in the texheader.json. When you are done editing the .txt file, convert it back to .btp using the same program.

Bone Animations:
Character select animations are kept in character-specific foldrs in Filesystem/SceneData/selectAnm.arc. These are .bck files Most of the in-game animations are kept in ARAM.arc/driveranm. These are .bca files. Drifting / Juggling animations are kept in Filesystem/MRAM.arc/driver. These are .bca files.
 * enter.bck is the animation that plays when you first select a character
 * wait.bck is the idle animation
 * gut.bck is the animation that plays when you confirm the characters / kart combo.
 * a_drive_a: part of front seat normal
 * a_drive_b: front seat holding item
 * b_dwait_a: backseat hanging off
 * b_dwait_b: backseat hanging off
 * c_wait_b: mushroom pose - no sideways input
 * b_ means backseat, front facing
 * c_ means backseat, back backing
 * _a means without an item
 * _b means with an item
 * l means left drift, r means right drift, and s is the shifting animation

Why changing some animations can be a bad idea: Some characters share in-game animations with others. A list of shared animations can be found here. Changing any shared animation changes the animation for all of the characters. Trying to "unshare" the animations by putting them in the character-specific folders is currently untested, and issues due to file size arise.

.bck files can be viewed in J3dView via the steps above.

= Editing Karts =

Kart model files are kept in Filesystem/MRAM.arc/kart. It is generally expected that you edit the character’s kart to match the character if necessary, because karts are tied directly with characters in this game.

Kart Model Files:
 * body: the main body of the kart
 * tire_l: the left wheel
 * tire_r: the right wheel
 * shock: coil that connects the wheel to the body - typically on the side of the body
 * arm: metal bar that connects the wheel to the body - typically under the body

Just doing a texture hack (J3dview):
J3dView can be used to do kart texture changes. Textures can be exported / replaced textures by right-clicking on the texture name in the upper left corner of the program. To get textures: To replace textures:
 * Exporting the textures from J3dView can only be converted to .png via DouBOL Dash's .bti viewing tool, which can be tedious.
 * Exporting the vanilla model via SuperBMD will give you the textures, and is the best of one-off use.
 * If you plan on doing multiple texture hacks, using Dolphin's texture dumping capabilities will quickly give you all of the images necessary (and then some).
 * 1) Convert the custom texture into .bti using wimgt (described above).
 * 2) Right click on the texture name in the upper left corner of the program, and select "Replace"
 * 3) Select your custom .bti file
 * 4) If needed, adjust some of the texture settings to get it to match the vanilla settings.

Actually editing the kart model:
Follow the steps for converting from .bmd into .dae as shown above for characters, and import the kart model into your cadding program.

Meshes:
 * Keep the geometry of the chair, back platform, steering wheel, and handle close to vanilla. Keeping their height the same is essential, but small adjustments can be made to their length and width.
 * In general, try make your kart similar in length, width, and height to the vanilla model so that it does not look weird in-game.

Rigging:
 * The main bone defines where the front character will sit.
 * There is no bone for the back character, but you can tell where the back character will be by the model
 * All vertices should be rigged to this bone.
 * The other bones define where the exhaust comes out
 * This is not technically necessary - no exhausts are required.
 * Having up to two exhaust bones has been tested to work. 3+ is currently untested.

Materials / Textures:
 * Try to use the vanilla materials / texture names with the custom kart.

 Editing Kart Stats (not recommended when releasing):  The structure of each .set file is actually very simple - it’s just a bunch of floats. You can edit these with a hex editor or MKDD set file editor. The reason that releasing edited kart stats is not recommended is because they can mess up custom track staff ghosts.

 Necessary Images:  Kart Icon:
 * Kept in Filesystem/MRAM.arc/race2d.arc/timg
 * Dimensions: 64x64
 * Can be created by taking a screenshot of the kart at the desired angle in-game, and then cleaning up the image.