From: | Sebastian Pipping <sping@g.o> |
---|---|
To: | gentoo-dev@l.g.o |
Cc: | trustees@g.o |
Subject: | [gentoo-dev] [rfc] Rendering the official Gentoo logo / Blender 2.04, Python 2.2 |
Date: | Fri, 29 Apr 2011 00:30:28 |
Message-Id: | 4DBA0676.40509@gentoo.org |
1 | Hello! |
2 | |
3 | |
4 | Gentoo's official logo originates from a Blender file [1] created by |
5 | Daniel Robbis over 8 years ago. He used Blender 2.04 and Python 1.6 at |
6 | that time. |
7 | |
8 | When rendering that .blend file with Blender 2.49b (or a more recent |
9 | version), Blender does not apply the reflection texture needed [2] to |
10 | give the metal look that you know. I don't know why that is. All I |
11 | know is that Blender does find the file: it's not about the location. |
12 | |
13 | Trying Blender 2.04 binaries on a Windows VM, it turned out that Blender |
14 | 2.04 is still able to render our logo as expected. In my eyes rendering |
15 | our logo should not depend on a proprietary operating system or binary |
16 | blobs. The source tarball of Blender 2.04 is hard to find (if available |
17 | at all), the available sources of 2.03 [7] are incomplete. Binaries of |
18 | 2.04 [8] are 32bit only and crash on startup on my system. |
19 | |
20 | The earliest source tarball after 2.04 that upstream offers for download |
21 | [3] is Blender 2.26. That version does not compile with GCC 4.4 and |
22 | turns out to be home with Python 2.2. In hope that this version would |
23 | be able to render our logo in the way that Blender 2.04 did, I tried |
24 | fixing compilation against GCC 4.4.5. That worked [4]. The need for |
25 | Python 2.2 became clear when all of Python 2.4, 2.4 and 2.6 made it |
26 | segfault in Python related code instantly. Therefore I tried bringing |
27 | our old Python 2.2-r7 ebuild to life. Smaller changes like -fPIC were |
28 | needed but it wasn't too hard. You can find the Python 2.2-r8 in the |
29 | betagarden overlay [6]. In the end I could do |
30 | |
31 | sudo eselect python set python2.2 |
32 | |
33 | to compile and run Blender 2.26 and make it render g-metal.blend (after |
34 | adjusting the path to the reflection texture) with metal look in a |
35 | resolution of a few megapixel on transparent background. |
36 | I have the impression, that the rending is the same as of Blender 2.04. |
37 | |
38 | |
39 | However, this is not a good long-term solution. For instance Portage |
40 | doesn't operate under Python 2.2 so an ebuild for Blender 2.25 is a |
41 | tricky thing to do nowadays. |
42 | |
43 | Among the options I see is the following: |
44 | |
45 | A) Find out how to render g-metal.blend with recent Blender |
46 | (2.57b at best) to give pixel-identical results to Blender 2.04. |
47 | Needs an advanced Blender user ideally. |
48 | |
49 | B) Port Blender 2.26 to a recent version of Python. |
50 | |
51 | Are there any other options? |
52 | |
53 | What do you think? |
54 | |
55 | I would also like to encourage you to reproduce the process I described |
56 | to spot any problems I overlooked. |
57 | |
58 | Thanks for reading up to this point. |
59 | |
60 | Best, |
61 | |
62 | |
63 | |
64 | Sebastian |
65 | |
66 | |
67 | [1] |
68 | http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-src/gentoo-web/blend/g-metal.blend |
69 | [2] |
70 | http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-src/gentoo-web/blend/metallandscape1.jpg |
71 | [3] http://download.blender.org/source/ |
72 | [4] http://git.goodpoint.de/?p=blender-2.26.git;a=summary |
73 | [5] |
74 | http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/dev-lang/python/python-2.2-r7.ebuild?hideattic=0&view=markup |
75 | [6] |
76 | http://git.overlays.gentoo.org/gitweb/?p=proj/betagarden.git;a=commitdiff;h=a3712c45dee61717cbc09b39ff868af7a3ccaa89 |
77 | [7] http://download.blender.org/source/chest/blender_2.03_tree.tar.gz |
78 | [8] http://download.blender.org/release/Blender2.04/ |
Subject | Author |
---|---|
Re: [gentoo-dev] [rfc] Rendering the official Gentoo logo / Blender 2.04, Python 2.2 | "Michał Górny" <mgorny@g.o> |
Re: [gentoo-dev] [rfc] Rendering the official Gentoo logo / Blender,2.04, Python 2.2 | Mario Bodemann <theclaw@××××××××××××.de> |