Changed load_post (typo probably -> was pre_render in if statement

SyncPipline (load_callback function is now persistent such that blender does not flush this handler when load new file)
Unregister removes the callback

-> Why does loading the .blend file somehow set up the pipeline which was used for this file correctly but does not include shaders pinned to materials)
-> Fix this?

render_ribmosaic/__init__.py

@@ -166,7 +166,7 @@ def register():
         RibmosaicInfo("ribify module not found, using script level exporter")
 
     bpy.utils.register_module(__name__)
-    #bpy.ops.wm.ribmosaic_modal_sync()
+    #bpy.ops.wm.ribmosaic_pipeline_sync()
 
 
 def unregister():

render_ribmosaic/rm_export.py

@@ -2614,12 +2614,12 @@ def _ribify_cache(self, material_idx=0):
             # for unused materials
             if ("PointsPolygons" in firstLine):
                 # List all faces using current material
-                solids = [f for f in self.mesh_exportdata.faces if \
-                    f.material_index == material_idx]
+                solids = [p for p in self.mesh_exportdata.polygons if \
+                    p.material_index == material_idx]
                 # make a List of used face indices
-                faces = [f.index for f in solids]
+                faces = [p.index for p in solids]
                 # Find highest used vert index
-                lastV   = max([v for f in solids for v in f.vertices])
+                lastV   = max([v for p in solids for v in p.vertices])
                 tagMode = 0
                 perFace = 0
                 fIndex  = 0
@@ -2654,8 +2654,8 @@ def _ribify_cache(self, material_idx=0):
             # If geometry is SDS then insert hole tags to disable faces
             # for unused materials
             elif ("SubdivisionMesh" in firstLine):
-                holes = [f.index for f in self.mesh_exportdata.faces if \
-                    f.material_index != material_idx]
+                holes = [p.index for p in self.mesh_exportdata.polygons if \
+                    p.material_index != material_idx]
                 tagMode = 0
                 for l in self._pointer_cache:
                     if (tagMode == 3):

render_ribmosaic/rm_operator.py

@@ -1242,6 +1242,8 @@ def invoke(self, context, event):
 # #############################################################################
 # PIPELINE OPERATORS
 # #############################################################################
+from bpy.app.handlers import persistent
+@persistent
 def load_callback(data):
     print("load callback")
     bpy.ops.wm.ribmosaic_pipeline_sync()
@@ -1260,7 +1262,8 @@ def execute(self, context):
         print("wm.ribmosaic_pipeline_sync()")
         # FIXME : load_post handlers never get executed because blender
         # clears them on file load
-        if not load_callback in bpy.app.handlers.render_pre:
+        # make 
+        if not load_callback in bpy.app.handlers.load_post:
             bpy.app.handlers.load_post.append(load_callback)
 
         # Sync pipeline tree with current .rmp files