Fix #2

It appears that we were storing PyHSPlasma objects in class attributes, so
they were being held after the plResManager went away--therefore their
keys were nuked. We should probably be holding keys and not objects, but
this fix works regardless.

korman/exporter/convert.py

@@ -24,11 +24,9 @@ from . import mesh
 from . import utils
 
 class Exporter:
-    # These are objects that we need to export as plSceneObjects
-    _objects = []
-
     def __init__(self, op):
         self._op = op # Blender export operator
+        self._objects = []
 
     @property
     def age_name(self):

korman/exporter/manager.py

@@ -43,13 +43,13 @@ _pool_types = (
 class ExportManager:
     """Friendly resource-managing helper class."""
 
-    _nodes = {}
-    _pages = {}
-
     def __init__(self, version):
         self.mgr = plResManager()
         self.mgr.setVer(version)
 
+        self._nodes = {}
+        self._pages = {}
+
         # cheap inheritance
         for i in dir(self.mgr):
             if not hasattr(self, i):

korman/exporter/material.py

@@ -22,10 +22,9 @@ from . import explosions
 from . import utils
 
 class MaterialConverter:
-    _hsbitmaps = {}
-
     def __init__(self, exporter):
         self._exporter = weakref.ref(exporter)
+        self._hsbitmaps = {}
 
     def export_material(self, bo, bm):
         """Exports a Blender Material as an hsGMaterial"""

korman/exporter/mesh.py

@@ -85,13 +85,13 @@ class _DrawableCriteria:
 
 
 class MeshConverter:
-    _dspans = {}
-    _mesh_geospans = {}
-
     def __init__(self, exporter):
         self._exporter = weakref.ref(exporter)
         self.material = material.MaterialConverter(exporter)
 
+        self._dspans = {}
+        self._mesh_geospans = {}
+
     def _create_geospan(self, bo, mesh, bm, hsgmat):
         """Initializes a plGeometrySpan from a Blender Object and an hsGMaterial"""
         geospan = plGeometrySpan()