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Voronoi Gradient v1.2
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11.0, 10.5, 10.0 or later
Linux, Mac, Windows
07 May 2019
196
Nuke implementation for 2D Gradients.
Create an arbitrary number of color-samples in 2D, which will produce a smooth, natural interpolation over the entire image.
The Gizmo uses Natural Neigbor Interpolation to calculate the pixels inbetween samples, using Blinkscripts.
You can also output the underlying Voronoi Diagram.
Another important function is the ability to sample input colors, instead of defining them yourself. Setting the Type to 'Sample' used all created points to sample the input colors at given positions.
Changing the Colorspace will change the color falloff. This can be used to achieve the best artistic result.
There are several tricks used in this Gizmo to make it work, one being a method to feed an arbitrary number of input parameters into a Blinkscript. All types of Nuke scripting are going on here, like Python, TCL, Expressions and Blinkscripts. Please report any bugs you find, I am sure there still are some. The user knobs and the inside of the gizmo are well documented to help with understanding the concept.
Animation on the Position and Color knobs is not supported. I might redo the gizmo as C++ plugin in the future to solve this isse and to introduce a gap-filling method, that assumes every given pixel as sample and fills in holes that are defined by a black alpha.
Using the Sample Type to generate a cleanplate:
Update to 1.1
- Fixed the string separator declarations for some Expressions from ',' to ,
Update to 1.2
- Fixed another Expression I forgot in 1.1
Comments
Two things though:
-the "to" points shoe up in the viewer but they don't do anything?!
-it'd be great to implement the "Magic Carpet" functionality of sampling the incoming area under the respective point for the colour rather than having to set it manually.
A plugin version of this would be great to make it a bit faster.
The sample functionality is already implemented, just change the Type parameter to Sample :)
What do you mean with "to" points. I expect the viewer to look like the one in the screenshot above.
A plugin would be faster indeed, but the problem lies within the algorithm. My code is short, clean and slow
There is a way faster method to calculate the pixels, but its implementation is really hard, so instead I used the brute-force approach, that scales quadratically with image size. In order to reduce the processing time to less than 1s I added the optimization parameter. If you crank that up it will be a lot faster.
The whole setup is quite experimental and uses a lot of tricks/hacks in different places, I don't even know how it works on another system.
Indeed, it's all there and the "to" points in the viewer was user error.
Awesome, this will be a great supplement for IBK workflows, thanks!
I hope it will be a simple method to generate cleanplates for keying. Right now I am working on a variation of this tool, to fill in missing information (= black alpha) in an image. This is pretty straightforward , but takes even longer to calculate. As long as I don't come up with speed improvements in the Blinkscript itself.
ERROR: VoronoiGradient 1.Expression_Sa mpleColor.temo_ expr0: Unexpected '' in '[sample [node sample_image] red... and so on, I'll attach link to screenshot. www.kalderafx.com/vfx/nukegizmos/voronoigradient/voronoigradient_error_01.jpg
Also it seems that animated points are not properly evaluated, image is not refreshed even when I force-refresh and clear cache.
working with Nuke 10.5
ERROR: VoronoiGradient 1.Expression_Ge nerateColor.tem p_expr3: Nothing named 'Nothing' in '[value this.parent.col or_[lindex [split [value this.parent.poi nts] ,] [frame]].a]'
thanks!
Apart from that, amazing!!
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