Blender: Advanced postprocessing effects with BURP


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Message 6591 - Posted: 17 Aug 2007, 12:24:41 UTC
Last modified: 2 Apr 2008, 8:29:25 UTC

Keywords: CATS, motionblur, defocus, postprocessing, effects.

Using some of the advanced postprocessing features of Blender together with BURP is quite a challenge since just doing the usual node-based postprocessing directly will cause image artifacts due to the fact that not all image data is available at render-time.
This tutorial video explains the issue and takes you on a journey through the entire process of rendering a session with advanced postprocessing filters while still using the BURP renderfarm to do the computationally expensive calculations.
The tutorial doesn\'t require any specific Blender knowledge and may be interesting to both beginners and slightly more experienced Blenderheads - most of the fundamental concepts are explained along the way.

You can find the tutorial video here

If you whish to read more about the filters used in this tutorial you can follow these links:
http://www.blender.org/development/release-logs/blender-242/vector-blur/
http://wiki.blender.org/index.php/Manual/Vector_Blur#Using_Vector_Blur
http://www.blender.org/development/release-logs/blender-243/composite-defocus/

Additional notes about the tutorial:

Images from session 530 are used in the beginning of the tutorial. Sessions 559 and 567 were both used in the creation of the tutorial - although only the latter was included in the videofile itself. 559 remains interesting because it shows artifacts caused by a preprocessing effect called subsurface scattering. Presently there seems to be no known way to use effects that require preprocessing without having to render the image in its entirity as a single part.

It is worth noting that the vector based motionblur filter requires that enough vertices are inside the screen area when applying the filter. This can be ensured by using the subdivision effect on the relevant objects in the scene (by choosing the simple subdivision option instead of the smoothing one objects will stay the same but have more faces - and hence vertices). This is not shown in the tutorial, nor is it done in the .blend attached to the tutorial. If you intend to reproduce the effect you should be aware of this. It only needs to be done in the local version of the scene file, though.

If, for some reason, you wish to link to this tutorial, please use http://burp.boinc.dk/pp-tutorial rather than linking directly to this page or to any of the video files. This will ensure that your link stays intact and valid for as long as possible.

To play the video tutorial you will need a player which is compatible with XviD and MP3. VideoLAN client or MPlayer are both capable of playing the content on most platforms (Windows, Linux, OSX etc.).
If you would rather prefer to use a VFW-compatible player (like Windows Media Player) you will need the XviD codec as well as a codec capable of playing MP3 audio streams. Alternatively you can install the ffdshow-tryouts fork of ffdshow for a whole suite of nice decoding options.
The tutorial is made with high-resolution video and high-fidelity audio. Optimal playback conditions can be achieved on a 1280x1024 screen - since the content can then be played without scaling the pixels. Not all systems can cope with the playback of such content. If your system is incapable of playing back the high-resolution version you should try out the lower quality version available in the download post below this (however it may then be difficult to read the text on the screen).

Feel free to use this thread to comment on or ask questions about the tutorial.

Enjoy!

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Message 6592 - Posted: 17 Aug 2007, 17:29:47 UTC - in response to Message 6591.
Last modified: 19 Jun 2010, 12:54:27 UTC

Tutorial download:

[Low quality 39.77 MB] Scaled down version, low quality audio (96Kbit/s), low video bitrate, not easily seekable (low amount of keyframes)
[HD quality 122.31 MB] High-Definition version - you get to see all the details

If you have a Bittorrent client please try out the Bittorrent links (available from the download pages above) and post about your experience.

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Message 10474 - Posted: 23 Apr 2010, 0:08:21 UTC


This seems to have gotten lost in the migration.

Any chance to easily get it back online?

It's probably out of date, but still useful, and a favorite of mine. I used it to add some defocus to my session 949. It was very helpful.

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Message 10475 - Posted: 25 Apr 2010, 6:40:57 UTC

Yup, added to the todo-list

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Message 10542 - Posted: 19 Jun 2010, 12:57:58 UTC - in response to Message 10475.

And it's back online

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Message 11779 - Posted: 18 Apr 2013, 9:10:53 UTC - in response to Message 6591.

You can also use this WMV MP4 converter to convert uncompatible video files to a more common standard file, if you want to use a VFW-friendly player.
Haven't used it in a while though so i am not sure how its going.

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Message 14593 - Posted: 2 Jul 2016, 12:06:27 UTC

It is worth noting that the vector based motionblur filter requires that enough vertices are inside the screen area when applying the filter. This can be ensured by using the subdivision effect on the relevant objects in the scene (by choosing the simple subdivision option instead of the smoothing one objects will stay the same but have more faces - and hence vertices). This is not shown in the tutorial, nor is it done in the .blend attached to the tutorial. If you intend to reproduce the effect you should be aware of this. It only needs to be done in the local version of the scene file, though.
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