I was lying in a hospital bed, unable to work, when the idea hit me: what if I could build a 3D renderer that draws the way a technical sketch artist does—with wobble, with gaps, with the kind of imperfection that makes a drawing feel alive?
That’s Krbn. A rendering engine that doesn’t try to fool you with photorealism. Instead, it asks a radical question: “Which lines would an artist actually draw, and what would they leave out?”
Most AI tools are fighting the wrong war. They want to replace human artists by generating infinite, perfect simulations. Krbn wants to collaborate with them—by embracing the very flaws we’ve spent decades trying to eliminate.
Here’s how it works: strokes are derived directly from geometry—true conics, quartics—rather than sampled from a shading model. There’s no alpha channel; the gaps between lines do the work, just like on paper. And the hand-wobble? It’s seeded. That means two successive renders are byte-stable—zero changes in Git. No more “boiling” animations. You get the organic feel of a sketch, with the reproducibility of code.
“The most advanced renderer isn’t the one that looks most like reality—it’s the one that looks most like a memory.”
I built this with significant AI assistance, deliberately. Not to automate artistry, but to explore how far a carefully directed human-AI collaboration can go on a hard rendering problem. The briefs are in the repo. Judge for yourselves.
The paradox is delicious: we used precise geometry, seeded randomness, and AI to simulate the exact kind of imperfection that makes a hand-drawn sketch priceless. Every wobble, every gap is mathematically exact yet deliberately imperfect. And the output is stable enough to animate without breaking a sweat.
This isn’t a pitch. It’s an invitation to skim something I find fascinating. A childhood dream realized from a hospital bed, proving that sometimes the most innovative use of AI isn’t to make things more real—it’s to make them more human.
Check the gallery: https://github.com/vpalos/Krbn/tree/main/examples
Most AI art is about copying. Krbn is about creating something that only a human would think to leave out.
FAQ
Q: Doesn't this just produce low-quality output compared to photorealistic renderers?
A: It's not aiming for quality in the photorealism sense. It's aiming for a specific aesthetic—the look of a hand-drawn technical sketch. If you need photorealistic product shots, use Blender. If you want something that feels like it was drawn by a human, Krbn is superior.
Q: What's the practical use for developers?
A: The byte-stable output is a game-changer for animation and version control. You can check a render into Git and know it won't change. The seeded wobble means animations don't 'boil' between frames. It's ideal for generating consistent, stylized diagrams, architectural sketches, or any 3D scene that needs a hand-drawn feel.
Q: Isn't this just a gimmick? Real artists don't need AI to draw imperfectly.
A: The point isn't to replace artists—it's to give developers and designers a way to produce that aesthetic programmatically. Krbn automates the tedious parts (perspective, geometry) while preserving the human touch (wobble, gaps). It's a tool for collaboration, not replacement.