4 files changed, 67 insertions(+), 1 deletions(-)

M zola/content/rnd-blender-arnold-002/index.md
A zola/content/rnd-blender-arnold-004/blender-4.0-splash-arnold.png
A zola/content/rnd-blender-arnold-004/blender-4.0-splash-cycles.png
A zola/content/rnd-blender-arnold-004/index.md

@@ 5,7 5,7 @@ draft = false
 
 [taxonomies]
 categories = ["DCC"]
-tags = ["blender", "arnold"]
+tags = ["blender", "arnold", "python"]
 +++
 
 The last part ([Blender to Arnold Export - Part I: The

@@ 0,0 1,66 @@
++++
+title = "Blender to Arnold Export - Part IV: Blender 4.0 Splash Screen"
+date = 2023-11-27
+draft = false
+
+[taxonomies]
+categories = ["DCC"]
+tags = ["blender", "arnold", "python"]
++++
+
+The last part ([Blender to Arnold Export - Part III: Base
+ Color](@/rnd-blender-arnold-003/index.md)) talked about exporting
+ some color information (from [Blender](https://www.blender.org))
+ instead of using full materials/shaders. So basically the **light
+ sources** are still not taken into account. But can we export the
+ latest `Splash Screen` (for `Blender 4.0`) to
+ [Arnold](https://arnoldrenderer.com)?
+
+![Blender 4.0 Splash Screen rendered by
+Cycles](./blender-4.0-splash-cycles.png)
+
+The image above was rendered by
+[Cycles](https://www.cycles-renderer.org). I had to modify the
+[Python](https://www.python.org) code a bit to export the camera in
+case it's not part of a `Collection`.
+
+```python
+...
+class AssExporter:
+    def __init__(self):
+        self.filename = None
+
+    def export(self, context, filename, use_shader_file, use_shader_file_only):
+        def exportMaterials():...
+        def exportCamera():...
+...
+            print('DEBUG: export collections ...')
+...
+                            if me is None:
+                                if ob.type == 'CAMERA':
+                                    if ob.name == camera_name:
+                                        exportCamera()
+...
+        if not camera_exported and len(bpy.data.cameras) >= 1:
+            # camera was not part of a collection
+            objects = bpy.data.objects
+            for i, ob_main in enumerate(objects):
+                obs = [(ob_main, ob_main.matrix_world)]
+                for ob, ob_mat in obs:
+                    if ob.name == camera_name:
+                        print('DEBUG: export camera ...')
+                        exportCamera()
+...
+```
+
+The current source code can be found on
+[Codeberg](https://codeberg.org/wahn/Arnold/src/branch/master/blender/io_scene_ass). The
+Python source code is probably changing with the latest Blender
+releases, whenever I feel the need to render at least a similar scene
+with Arnold.
+
+![Blender 4.0 Splash Screen rendered by Arnold](./blender-4.0-splash-arnold.png)
+
+This is it for now. On the `TODO` list is being aware of `subdivision
+surfaces` during the export and taking `lights` into account (which
+needs also proper `materials/shaders`).