io_import_pskx

Experimental ActorX PSK/PSA importer for Blender 3.0+

I strongly recommend that you use https://github.com/DarklightGames/io_scene_psk_psa over this repo as I have only tested it with my custom sub-formats for PSK.

Installation

• Download the repository (Code -> Download ZIP in the top right, or clone the repository.)
• Remove -develop from the filename.
• Open Blender.
• Navigate through Edit -> Preferences -> Addons.
• Click "Install..."
• Navigate to where the repository is downloaded.
• Install the zip/folder.

Alternatively copy the repository directory into your Blender Addons folder:

• %APPDATA%/Blender Foundation/Blender/3.0/scripts/addons on Windows.
• ~/.config/blender/3.0/scripts/addons on Linux-based systems.
• ~/Library/Application Support/Blender/3.0/scripts/addons on macOS.

The folder may not exist, if so you should create it. The 3.0 may be a different number.

• In the Addons Preferences window again, click refresh if you manually copied the folder.
• Search Import ActorX, click the checkbox to the left of the name.

Usage

To import a PSK or PSA file, use the appropriate importer from File -> Import -> ActorX ...

Notice

A lot of functionality in this addon is non-standard, such as the inclusion of custom chunks like MORPHTARGET and the custom ANIXHEAD animation format. These are described below.

These are implemented in my fork of CUE4Parse, as of right now neither UModel or FModel support these new chunks.

This addon has only been tested in the output of the modified library, of which the mesh exporter has undergone significant changes to replicate Gltf exporting behavior and to accomodate for morph targets.

I do not plan or expect for official libraries to support these changes, nor will I support the output files from "normal" programs.

Outline of format-level changes

PSK - MORPHTARGET#

Repeated chunk with different suffixes, similar to EXTRAUVS (MORPHTARGET0, MORPHTARGET1, ...)

Suffix indicates morph target index.

16 bytes = int vertex_id, Vector position

Maps wedge indexes to a different location for shape keys (morph target.)

PSK - MORPHNAMES

Single chunk.

64 bytes - char[64] name

Maps morph target indexes to a non-unique name.

PSK - PHYSICS0

Single Chunk.

101 bytes - char[64] bone_name, byte type (0 = box, 1 = sphere, 2 = sphylinder), Vector offset, Vector rotation, Vector scale

Attaches a shape to a bone.

PSA - ANIXHEAD

Functionally identical to ANIMHEAD. Used to prevent issues with importers trying to import the standard format.

If the file signature is ANIXHEAD, expect SEQUENCES, POSTRACK and ROTTRACK streams instead of ANIMINFO and ANIMKEYS

PSA - SEQUENCES

Single Chunk.

72 bytes - char[64] name, float frame_rate, int additive_mode

Lists sequences present in the file, along with it's projected frame rate.

additive_mode =

0. None
1. Both Position and Rotation are handled additively
2. Only position is handled additively(?)

PSA - ROTTRACK#:#

Repeated chunk with different suffixes, different to EXTRAUVS.

Suffix indicates both the sequence and bone index: ROTTRACK[SEQUENCEID]:[BONEID] = ROTTRACK0:0, ROTTRACK0:1

20 bytes - float time, Quaternion rotation

Rotation keyframes for each sequence, bone and point in time. Will be interpolated linearly by Blender.

PSA - POSTRACK#:#

Repeated chunk with different suffixes, different to EXTRAUVS.

Suffix indicates both the sequence and bone index: POSTRACK[SEQUENCEID]:[BONEID] = ROTTRACK0:0, ROTTRACK0:1

16 bytes - float time, Vector position

Location keyframes for each sequence, bone and point in time. Will be interpolated linearly by Blender.

PSW - WRLDHEAD

File identifier for psw files

PSW - WORLDACTORS

Single Chunk.

368 bytes - char[64] name, char[256] asset_path, int parent, Vector position, Quaternion rotation, Vector scale, int flags

Lists actors present in the world.

PSW - INSTMATERIAL

Single Chunk.

72 bytes - int actor_id, int material_id, char[64] name

Specifies material overrides for a specific actor.

PSW - LANDSCAPE

Single Chunk.

296 bytes - char[256] map_path, int actor_id, float[2] xy, int type, int size, float height_mod, float[2] offset, int[2] dimensions

Sector size is a cube of size.

Specifies landscape components. To get the real value of the height, subtract 0.5 and multiply by 2 then by height_mod.

Height_mod is calculated as 256 / (scale.UP + 1). When height maps are calculated, the UP value is eqauivalent to size.

So if scale.UP is not identical to size, adjust accordingly. You can optimize it by setting the vertical scale to 256 and ignoring height_mod.

Offset is the offset in the texture map, multiple sectors can subdivide the same texture. Dimensions indicates how many sectors should be in the texture.

Why an animation format change?

The old format is quite inefficient by duplicating idle keyframes. This leads to ballooned keyframe sizes, along with significant slowdown in Blender when used excessively (i.e. a long animation.)

The new format only stores keyframes if they actually change bone data, resulting in a smaller file and a more traditional approach to animations.

This is a breaking change, thus a different magic value is used.