Merge pull request #847 from stevenjt/python-scene-export

Added ability to export scenes with PyAssimp

port/PyAssimp/README.md

@@ -6,8 +6,7 @@ Requires Python >= 2.6.
 
 Python 3 support is mostly here, but not well tested.
 
-Note that pyassimp is not complete. Many ASSIMP features are missing. In
-particular, only loading of models is currently supported (no export).
+Note that pyassimp is not complete. Many ASSIMP features are missing.
 
 USAGE
 -----

port/PyAssimp/pyassimp/core.py

@@ -35,7 +35,7 @@ class AssimpLib(object):
     """
     Assimp-Singleton
     """
-    load, load_mem, release, dll = helper.search_library()
+    load, load_mem, export, release, dll = helper.search_library()
 _assimp_lib = AssimpLib()
 
 def make_tuple(ai_obj, type = None):
@@ -316,6 +316,33 @@ def load(filename,
     recur_pythonize(scene.rootnode, scene)
     return scene
 
+def export(scene,
+           filename, 
+           file_type  = None,
+           processing = postprocess.aiProcess_Triangulate):
+    '''
+    Export a scene. On failure throws AssimpError.
+    
+    Arguments
+    ---------
+    scene: scene to export.
+    filename: Filename that the scene should be exported to.  
+    file_type: string of file exporter to use. For example "collada".
+    processing: assimp postprocessing parameters. Verbose keywords are imported
+                from postprocessing, and the parameters can be combined bitwise to
+                generate the final processing value. Note that the default value will
+                triangulate quad faces. Example of generating other possible values:
+                processing = (pyassimp.postprocess.aiProcess_Triangulate | 
+                              pyassimp.postprocess.aiProcess_OptimizeMeshes)
+
+    '''
+
+    from ctypes import pointer
+    exportStatus = _assimp_lib.export(pointer(scene), file_type.encode("ascii"), filename.encode("ascii"), processing)
+
+    if exportStatus != 0:
+        raise AssimpError('Could not export scene!')
+
 def release(scene):
     from ctypes import pointer
     _assimp_lib.release(pointer(scene))

port/PyAssimp/pyassimp/helper.py

@@ -161,7 +161,8 @@ def try_load_functions(library_path, dll):
     If successful:
         Tuple containing (library_path, 
                           load from filename function,
-                          load from memory function
+                          load from memory function,
+                          export to filename function,
                           release function, 
                           ctypes handle to assimp library)
     '''
@@ -170,6 +171,7 @@ def try_load_functions(library_path, dll):
         load     = dll.aiImportFile
         release  = dll.aiReleaseImport
         load_mem = dll.aiImportFileFromMemory
+        export   = dll.aiExportScene
     except AttributeError:
         #OK, this is a library, but it doesn't have the functions we need
         return None
@@ -178,7 +180,7 @@ def try_load_functions(library_path, dll):
     from .structs import Scene
     load.restype = POINTER(Scene)
     load_mem.restype = POINTER(Scene)
-    return (library_path, load, load_mem, release, dll)
+    return (library_path, load, load_mem, export, release, dll)
 
 def search_library():
     '''
@@ -187,6 +189,7 @@ def search_library():
     
     Returns: tuple, (load from filename function, 
                      load from memory function,
+                     export to filename function,
                      release function, 
                      dll)
     '''