Character Models

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based on this forum post by member Markuss.

There are two linked .zip file attached to the forum post. they can be found here:

This guide assumes you are familiar with 3D Objects.


Characters in overgrowth consist of 4 .XML files, an .OBJ file, a .PHXBN file, a .fzx file and a hull .OBJ file. The .PHXBN and .fzx files are created in Blender, the PHXBN file contains the skeleton and skin weighting info. The .fzx file contains the collision information that the ragdolled character uses. The XML files just contain links to themselves and other files. They contain the following:

1 - Links to the .OBJ and .PHXBN files that the engine needs to rig the character.

<?xml version="1.0" ?>
<rig bone_path = "Data/Custom/Markuss/ExampleMan/Models/ExampleMan.phxbn"
     model_path = "Data/Custom/Markuss/ExampleMan/Models/ExampleMan.obj"/>

2 - A regular object file as described in the 3D reference guide.

<?xml version="1.0"?>

3 - Links to the first 2 files, and a load of animation files for each action.

<?xml version="1.0" ?>
    <appearance obj_path = "Data/Custom/Markuss/ExampleMan/XMLFiles/ExampleMan_Object.xml"
                skeleton = "Data/Custom/Markuss/ExampleMan/XMLFiles/ExampleMan_RigFiles.xml"/>
    <animations idle = "Data/Animations/r_idle2.xml"
                jump = "Data/Animations/r_jump.xml"
                roll = "Data/Animations/r_roll.xml"
                movement = "Data/Animations/r_movement.xml"
                wall = "Data/Animations/r_wall.xml"
                ledge = "Data/Animations/r_ledge.anm"
                medrightblock = "Data/Animations/r_activeblockmedright.anm"
                medleftblock = "Data/Animations/r_activeblockmedleft.anm"
                highrightblock = "Data/Animations/r_activeblockhighright.anm"
                highleftblock = "Data/Animations/r_activeblockhighleft.anm"
                lowrightblock = "Data/Animations/r_activeblocklowright.anm"
                lowleftblock = "Data/Animations/r_activeblocklowleft.anm"
                blockflinch = "Data/Animations/r_activeblockflinch.anm"/>
    <attacks moving_close = "Data/Attacks/haymaker.xml"
             stationary_close = "Data/Attacks/thrustpunch.xml"
             moving = "Data/Attacks/spinkick.xml"
             stationary = "Data/Attacks/frontkick.xml"
             moving_low = "Data/Attacks/soccerkick.xml"
             low = "Data/Attacks/sweep.xml"
             air = "Data/Attacks/legcannon.xml" />

4 - Links to the third file and an AI script, this is the file you choose when loading a character.

<?xml version="1.0" ?>

Model and Texture Requirements

Character Model Faces Z-axis

Models have to be triangles only and centered to the middle of the scene with location, rotation and scale set to zero. It should loosely match the pose and proportions of the Overgrowth characters, you can use the following file: ../Overgrowth/Data/Models/Characters/Rabbit/rabbit.obj.

If your character is not symmetrical, ignore the center line in the geometry, it has to be the "true" the center of the model, otherwise you will get errors.

There is no character shader that supports tangent space normal maps. If you want to use a tangent space normal map anyway, the cubemap shader can be used. Though doing so will make the object look a bit different in the engine. More information about these shaders can be found in the 3D Objects article.

This is what a Blank/Flat object-space normal map looks like


A repackaged version of Blender with the export addons and with the UI set up for making characters can be downloaded at the top of this article. It does not require an install and can be run from its folder. You may need to restart it once to get the export options to show up.

This article is not intended to teach how to use Blender, it only gives the information essential to get a character into the game. If you would like to learn more about Blender, the website has a good free tutorial video series that will introduce you to the software. With that in mind, here are the basic controls that you will need in Blender:

Control Function
Middle mouse Orbit
Shift + middle mouse Pan
Ctrl + middle mouse or scroll wheel Zoom
Right click Select object
Delete or X Remove selection
Shift + right click Select more then 1 object
Ctrl + P Bind selected mesh to active skeleton (armature deform)
Tab Toggle between object mode and last active mode
  1. Replace the white rabbit
    • Press File > Import > Wavefront (.obj) to import an obj file.
  2. Bind your own mesh to the skeleton
    • First select the mesh, then shift-select the skeleton to add it to your selection before you press Ctrl + P to bind them.
  3. Paint weights
    • You may want to look up a tutorial on painting weights in blender.
    • It is recommended that you test your character in engine with automatic weights to check that you have no errors before you start working on a final weight paint. It won’t look pretty, but will let you know early on if the character is going to work in the engine.
  4. Export your files
    • With skeleton selected in object mode, export as .PHXBN, same for mesh but as .OBJ. Your model needs to be in rest position when doing this.
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