VFX with Natron - E0088 - Z-Buffer Depth of field - Open Chat Exploration
In this episode we had another open chat exploration on the topic of z-buffers, and ways one might approach depth of field in Natron. While Natron has the community plugin zDefocus, which was designed to work with a Blender non clamped z-buffer (exr) file, we have a situation where a clamped z-buffer (png) was made using Mandelbulb, and it is causing issues. So first we are going to build our own solution for this type of z-buffer (which will also work for using , and then we are going to play around and see if we might be able to get it to work with zDefocus.
Contents:
0:00:00 - Intro
0:00:17 - Preamble
0:00:40 - Thomas Morley FOSS365 ( / foss365 )
0:01:24 - Looking at our source files (links below)
0:02:18 - Initial look at the zDefocus Node and how it's specific to Blender (exr) files
0:07:34 - Building our own depth of field z-buffer solution
0:19:21 - Looking at the results of our z-buffer solution.
0:20:00 - Time to try putting a square peg into a round hole (zDefocus)
0:20:20 - When a black alpha is actually white (a change to the image node - skippable)
0:23:04 - The EXR vs PNG issue or Unclamped vs Clamped formats
0:30:23 - Adding curves to shape the falloff (aka The Color Lookup node)
0:33:14 - How to set the zDefocus Gamma if the Gamma is wrong
0:34:00 - Playing around with the curves and zDefocus to try and restore lost control
0:35:33 - Copying some previous settings I left off at (skippable)
0:36:13 - Background offset a crucial control for background blur
0:40:29 - The foreground blur and more color lookup adjustments.
0:41:43 - A lot of pointless testing (Very Skippable)
0:50:55 - Not working as expected, time to wrap things up
0:52:03 - My recommendation use EXR if using zDefocus
0:52:53 - Or use the DoF we built earlier for a PNG z-buffer
0:53:26 - No perfect solution for all types of z-buffers, because it's not standardized
0:54:41 - Thanks for watching and outro
The two source images can be found here:
The Frame: https://www.dropbox.com/s/3hn54zp1fy2...
The Z-Buffer: https://www.dropbox.com/s/w2krnr4ghxn...
There are currently no project files currently associated with this video.
Live stream from July 5, 2021
With: Pirate Bill
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