KeyingScreen Compositor node emits "black holes" #69079
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The attacged folder shows a bug in the KeyingScreen compositor node.
In the Screenshot GreenPlateBug-Screenshot.png it can be seen in the above compositor window that some areas are filled with black
instead of grey / green.
That appeared after creating the "last" track marker (the selected / larger track marker in the below window).
If you remove that larger marker, the bug disappears.
To reproduce, open the attached blend file, close render window, disconnect / reconnect the viewer node to the keying screen node to
see in backdrop display.
The bug appeared in a different usage of the KeyingScreen node with much fewer track markers, but since the circumstances of
the bug to appear is unclear, i had to add a lot marker here.
Blender version 2.80 (snap Ubuntu version).
OS: Ubuntu 19.04 x86
Graphics Card: Prime Laptop (NVidia / Intel combination) Dell Inspirion 4500 Laptop in Intel mode
Added subscriber: @hcw70
GreenPlateBug.zip
Added subscriber: @Jeroen-Bakker
@Jeroen-Bakker Maybe you could have a look?
Added subscriber: @lichtwerk
Changed status from 'Needs Triage' to: 'Confirmed'
Sorry this has been lying around for so long.
Can confirm for this particular case/marker.
Black holes also disappear if any of these two markers are removed:
Checking...
Added subscriber: @Sergey
Some sort of failure of the voronoi magic;
For some very specific marker positions, we are running into the situation where some pixels just dont want to fit into any of the computed triangles,
barycentric_inside_triangle_v2is always false for them...(or maybe there is something else going wrong in KeyingScreenOperation::buildVoronoiTriangulation?)
Here is an even simpler case (just those three culprit markers)
GreenPlateBug repro.blend
CC @Sergey
The actual root of the problem is that voronoi calculation/triangulation does not generate triangles for those regions. This can be seen by dumping triangles and plotting them (I did t manually, so a bit hard to share anything easy-to-repro-to-see-the-problem).
This is fixed by the new Keying Screen node introduced in Blender 4.1.