Looks impressive David; sort of like Bevel Reflect Logo. Maybe give option to add different types of textures to would be cool. 
So, here it is !
A first version of the filter Light & Shadows / Illuminate 2d shape has been published today, and should be available for users of the G’MIC plug-in for GIMP and Krita (requires version 2.2.2+).
Here is a video that shows what it can do.
https://www.youtube.com/watch?v=AUVTbrdGznw
Right now, I admit I’m quite enthusiastic by this filter, as it really allows shading complex shapes with a few clicks.
Remind also that this is a first version, so subject to changes.
Please let me know what you think about it !
Some before/after comparisons :
4 Likes
I love this! <3
The Effect could separate by layers and attain something like this:
Just select Output modes -> New layers and you will get the illumination layer alone, blended with your original image.
Then you can re-work on this illumination layer to create various effects or correct light locally if you want.
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I what thought was in slight variations for each level and something similar to colorize [interactive] for the levels.
Not planed like this sorry
I will have to automate it in a script 
2 Likes
That’s interesting.
Have you used the exact same parameters of the filter for all colors ?
yes. But no it apply it to him to line (black)
You can get the same effect by playing with blending modes and opacity…
I like mine better though.
no. It is subtly different. It looks the cap and the tongue
There’s a easy way to make plushies render now. Something that I’d like to see is contour adjustment, but that’s not necessary, but would make for a nice feature to this filter.
OK; had to play (just got home from work an hour ago and then I needed to cook me something to eat; lol). Pretty cool stuff, David. Yes; separated the colors first before running on each layer.
I am wandering if this filter can be used to re-light a photo. For example portrait. See example
Original
Mask
Light from left
Light from right top
5 Likes
Awesome
I’ve some various plans to improve this filter, one of them being a way to specify an input mask so that illumination of multiple different shapes can be done at the same time.
Stay tuned !
2 Likes