Hello there,
I've been working recently on the inclusion of Truchet-like patterns into the filter Patterns / Op-Art available in the G'MIC plug-in for GIMP.
What I wanted to do is generating Truchet patterns that can be placed randomly (and rotated) without visible seams (so an usual Truchet pattern ),
but at the same time, some of them should have slight differences so that they can make the impression of encoding a luminance of each pixel of an input image.

What I've ended up with is a code that generates a family of more or less eroded/dilated Truchet patterns (but all seamless together, they join perfectly).
And then, I've added them to the filter. I've also added a general Allow angle option, so that any selected pattern can be randomly rotated by the Op-Art filter if needed.

At the end, it looks like this (go far from the screen to get a better illusion !)



So, Lyle, what do you think about it ? :p

You can already play with this new toy, by updating your filters (requires 1.5.8.0+ by the way).

Cool David, When I sit way back I see an eye. or am I having delusions? I have to shake my head to clear it

Thx molly.
With more subtle parameters, it's sometimes very hard to get it when I stay near the screen.
Like this one, e.g :

wow, that is really cool, It shows up well when I look from the other side of the room.

I agree with Molly only I just had to look to the side of the picture.
Couldn't make it out before. Didn't know what I was supposed to be seeing.

Far out David!

Wow!!!
Work super nice!
Loved the facility of obtaining these results, almost one click!

oh nice!!! i love this kind of images, the kind that gives me both a pattern and another image. i'm gonna have to try this soon!

My Effort

Nice Kimba.