Fix issue with incorrect face count when model has quads/n-gons

DEVNOTES.md

@@ -2,8 +2,33 @@
 
 I'm storing links and code snippets here related to Blender scripting, to save me googling in the future ;)
 
+# TODO
+
+## Export multiple objects
+
+Allow multiple meshes to be exported, and create a dummy bone per mesh. This is so every "sub mesh" can get its own collision in-game.
+
+## 3DF import
+
+Create mesh, convert face-uv to vertex-uv. Look into creating Armature and weights based on the 3DF.
+
+## CAR import
+
+Use 3DF import code for base mesh, import animation frames as shape keys.
+
+# Links
 
 ## Animation
 
 - Keyframe information: https://blender.stackexchange.com/questions/27889/how-to-find-number-of-animated-frames-in-a-scene-via-python
 - Multiple animation export: https://blender.stackexchange.com/questions/3281/how-do-i-export-animation-data-stored-in-actions-using-the-python-api
+
+## Shape keys
+
+- Shape key creation: https://blender.stackexchange.com/questions/111661/creating-shape-keys-using-python
+
+## Armature/Bones
+
+- https://blender.stackexchange.com/questions/51684/python-create-custom-armature-without-ops
+- https://devtalk.blender.org/t/vertex-weights-and-indices-for-a-bmesh/1457
+- https://devtalk.blender.org/t/help-implementing-animation-in-blender-2-8-import-addon/7093

io_carnivores.py

@@ -4,7 +4,7 @@
 bl_info = {
     "name": "Carnivores Model/Animation Export (3DF,VTL)",
     "author": "Ithamar R. Adema",
-    "version": (1, 0, 2),
+    "version": (1, 0, 3),
     "blender": (2, 82, 0),
     "description": "Export plugin for classic Carnivores formats 3DF (base model), VTL (animations)",
     "category": "Import-Export",
@@ -61,14 +61,13 @@ def export_3df(context, filepath, obj, mat):
     # UV layer
     uv_layer = mesh.uv_layers.active.data
 
-    face_count = len(mesh.polygons)
-
     f = open(filepath, 'wb')
 
     # Write Header
-    f.write(struct.pack("<LLLL", len(mesh.vertices), face_count, 1, 0)) # bones, texturesize
+    f.write(struct.pack("<LLLL", len(mesh.vertices), len(mesh.polygons), 1, 0)) # bones, texturesize
 
     # Write faces
+    face_count = 0
     for poly in mesh.polygons:
         # Start of poly loop
         start = poly.loop_start
@@ -99,6 +98,7 @@ def export_3df(context, filepath, obj, mat):
                 0, # group
                 )
             )
+            face_count += 1
 
     # Write Vertices
     for v in mesh.vertices:
@@ -107,6 +107,11 @@ def export_3df(context, filepath, obj, mat):
     # Write default bone
     f.write(struct.pack("<32sfffhH", b'default', 0, 0, 0, -1, 0)) # x,y,z, parent, hidden
 
+    # Optionally fix up face count in header, due to quad/n-gon conversion
+    if face_count != len(mesh.polygons):
+        f.seek(4)
+        f.write(struct.pack("<L", face_count))
+
     f.close()
 
     return {'FINISHED'}