Moving blender render files to be accessed via pkg_resources

Previously the .blend and .py files had to be in the same directory
mediagoblin/celery launched from.  This is now fixed so it pulls them
out of the package proper.

mediagoblin/media_types/stl/assets/blender_render.py

@@ -0,0 +1,84 @@
+# GNU MediaGoblin -- federated, autonomous media hosting
+# Copyright (C) 2011, 2012 MediaGoblin contributors.  See AUTHORS.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+import bpy, json, os
+
+
+try:
+    CONFIG = json.loads(os.environ["RENDER_SETUP"])
+    MODEL_EXT = CONFIG["model_ext"]
+    MODEL_PATH = CONFIG["model_path"]
+    CAMERA_COORD = CONFIG["camera_coord"]
+    CAMERA_FOCUS = CONFIG["camera_focus"]
+    CAMERA_CLIP = CONFIG["camera_clip"]
+    CAMERA_TYPE = CONFIG["projection"]
+    CAMERA_ORTHO = CONFIG["greatest"] * 1.5
+    RENDER_WIDTH = CONFIG["width"]
+    RENDER_HEIGHT = CONFIG["height"]
+    RENDER_FILE = CONFIG["out_file"]
+except KeyError:
+    print("Failed to load RENDER_SETUP environment variable.")
+    exit(1)
+
+
+# add and setup camera
+bpy.ops.object.camera_add(view_align=False, enter_editmode=False,
+                          location = CAMERA_COORD)
+camera_ob = bpy.data.objects[0]
+camera = bpy.data.cameras[0]
+camera.clip_end = CAMERA_CLIP
+camera.ortho_scale = CAMERA_ORTHO
+camera.type = CAMERA_TYPE
+
+
+
+# add an empty for focusing the camera
+bpy.ops.object.add(location=CAMERA_FOCUS)
+target = bpy.data.objects[1]
+bpy.ops.object.select_all(action="SELECT")
+bpy.ops.object.track_set(type="TRACKTO")
+bpy.ops.object.select_all(action="DESELECT")
+
+
+if MODEL_EXT == 'stl':
+    # import an stl model
+    bpy.ops.import_mesh.stl(filepath=MODEL_PATH)
+    
+elif MODEL_EXT == 'obj':
+    # import an obj model
+    bpy.ops.import_scene.obj(
+        filepath=MODEL_PATH, 
+        use_smooth_groups=False, 
+        use_image_search=False, 
+        axis_forward="Y", 
+        axis_up="Z")
+
+
+# rotate the imported objects with meshes in the scene
+if CAMERA_TYPE == "PERSP":
+    for obj in bpy.data.objects[2:]:
+        obj.rotation_euler[2]=-.3
+
+
+# attempt to render
+scene = bpy.data.scenes.values()[0]
+scene.camera = camera_ob
+scene.render.filepath = RENDER_FILE
+scene.render.resolution_x = RENDER_WIDTH
+scene.render.resolution_y = RENDER_HEIGHT
+scene.render.resolution_percentage = 100
+bpy.ops.render.render(write_still=True)

mediagoblin/media_types/stl/processing.py

@@ -18,6 +18,7 @@ import os
 import json
 import logging
 import subprocess
+import pkg_resources
 
 from mediagoblin import mg_globals as mgg
 from mediagoblin.processing import create_pub_filepath, \
@@ -29,6 +30,17 @@ from mediagoblin.media_types.stl import model_loader
 _log = logging.getLogger(__name__)
 SUPPORTED_FILETYPES = ['stl', 'obj']
 
+BLEND_FILE = pkg_resources.resource_filename(
+    'mediagoblin.media_types.stl',
+    os.path.join(
+        'assets',
+        'blender_render.blend'))
+BLEND_SCRIPT = pkg_resources.resource_filename(
+    'mediagoblin.media_types.stl',
+    os.path.join(
+        'assets',
+        'blender_render.py'))
+
 
 def sniff_handler(media_file, **kw):
     if kw.get('media') is not None:
@@ -55,7 +67,12 @@ def blender_render(config):
     arg_string = "blender -b blender_render.blend -F "
     arg_string +="JPEG -P blender_render.py"
     env = {"RENDER_SETUP" : json.dumps(config), "DISPLAY":":0"}
-    subprocess.call(arg_string.split(" "), env=env)
+    subprocess.call(
+        ["blender",
+         "-b", BLEND_FILE,
+         "-F", "JPEG",
+         "-P", BLEND_SCRIPT],
+        env=env)
 
 
 def process_stl(entry):
@@ -93,16 +110,16 @@ def process_stl(entry):
         path = create_pub_filepath(entry, name_builder.fill(name))
         render_file = mgg.public_store.get_file(path, "wb")
         shot = {
-            "model_path" : queued_filename,
-            "model_ext" : ext,
-            "camera_coord" : camera,
-            "camera_focus" : model.average,
-            "camera_clip" : greatest*10,
-            "greatest" : greatest,
-            "projection" : project,
-            "width" : width,
-            "height" : height,
-            "out_file" : render_file.name,
+            "model_path": queued_filename,
+            "model_ext": ext,
+            "camera_coord": camera,
+            "camera_focus": model.average,
+            "camera_clip": greatest*10,
+            "greatest": greatest,
+            "projection": project,
+            "width": width,
+            "height": height,
+            "out_file": render_file.name,
             }
         render_file.close()
         blender_render(shot)