Bumped the minimum Blender version to 2.90.

Unrecognized sections are now simply ignored.

README.md

@@ -1,13 +1,13 @@
-This Blender 2.80+ add-on allows you to import and export meshes and animations to and from the [PSK and PSA file formats](https://wiki.beyondunreal.com/PSK_%26_PSA_file_formats) used in many version of the Unreal Engine.
+This Blender 2.80+ add-on allows you to import and export meshes and animations to and from the [PSK and PSA file formats](https://wiki.beyondunreal.com/PSK_%26_PSA_file_formats) used in many versions of the Unreal Engine.
 
 # Features
 * Full PSK/PSA import and export capabilities
 * Non-standard PSKX file format with vertex normals, extra UV channels and vertex colors is supported for import only
 * Fine-grained PSA sequence importing for efficient workflow when working with large PSA files
-* Automatic keyframe reduction on PSA import
 * PSA sequence metadata (e.g., frame rate, sequence name) is preserved on import, allowing this data to be reused on export
 * Specific [bone groups](https://docs.blender.org/manual/en/latest/animation/armatures/properties/bone_groups.html) can be excluded from PSK/PSA export (useful for excluding non-contributing bones such as IK controllers)
 * PSA sequences can be exported directly from actions or delineated using a scene's [timeline markers](https://docs.blender.org/manual/en/latest/animation/markers.html), allowing direct use of the [NLA](https://docs.blender.org/manual/en/latest/editors/nla/index.html) when creating sequences 
+* Manual re-ordering of material slots when exporting multiple mesh objects.
 
 # Installation
 1. Download the zip file for the latest version from the [releases](https://github.com/DarklightGames/io_export_psk_psa/releases) page.

io_scene_psk_psa/__init__.py

@@ -1,8 +1,8 @@
 bl_info = {
     "name": "PSK/PSA Importer/Exporter",
     "author": "Colin Basnett, Yurii Ti",
-    "version": (4, 2, 0),
+    "version": (4, 2, 1),
-    "blender": (2, 80, 0),
+    "blender": (2, 90, 0),
     # "location": "File > Export > PSK Export (.psk)",
     "description": "PSK/PSA Import/Export (.psk/.psa)",
     "warning": "",

io_scene_psk_psa/psk/exporter.py

@@ -30,12 +30,14 @@ def _write_section(fp, name: bytes, data_type: Type[Structure] = None, data: lis
 def export_psk(psk: Psk, path: str):
     if len(psk.wedges) > MAX_WEDGE_COUNT:
         raise RuntimeError(f'Number of wedges ({len(psk.wedges)}) exceeds limit of {MAX_WEDGE_COUNT}')
-    if len(psk.bones) > MAX_BONE_COUNT:
-        raise RuntimeError(f'Number of bones ({len(psk.bones)}) exceeds limit of {MAX_BONE_COUNT}')
     if len(psk.points) > MAX_POINT_COUNT:
         raise RuntimeError(f'Numbers of vertices ({len(psk.points)}) exceeds limit of {MAX_POINT_COUNT}')
     if len(psk.materials) > MAX_MATERIAL_COUNT:
         raise RuntimeError(f'Number of materials ({len(psk.materials)}) exceeds limit of {MAX_MATERIAL_COUNT}')
+    if len(psk.bones) > MAX_BONE_COUNT:
+        raise RuntimeError(f'Number of bones ({len(psk.bones)}) exceeds limit of {MAX_BONE_COUNT}')
+    elif len(psk.bones) == 0:
+        raise RuntimeError(f'At least one bone must be marked for export')
 
     with open(path, 'wb') as fp:
         _write_section(fp, b'ACTRHEAD')

io_scene_psk_psa/psk/reader.py

@@ -1,4 +1,5 @@
 import ctypes
+import os
 
 from .data import *
 
@@ -46,5 +47,7 @@ def read_psk(path: str) -> Psk:
             elif section.name == b'VTXNORMS':
                 _read_types(fp, Vector3, section, psk.vertex_normals)
             else:
-                raise RuntimeError(f'Unrecognized section "{section.name} at position {15:fp.tell()}"')
+                # Section is not handled, skip it.
+                fp.seek(section.data_size * section.data_count, os.SEEK_CUR)
+                print(f'Unrecognized section "{section.name} at position {fp.tell():15}"')
     return psk