https://sebastjan-rijavec.github.io/blog Essays and notes by Sebastjan Rijavec. en https://sebastjan-rijavec.github.io/blog/quill https://sebastjan-rijavec.github.io/blog/quill Tue, 06 Oct 2026 00:00:00 GMT https://sebastjan-rijavec.github.io/blog/bbtab https://sebastjan-rijavec.github.io/blog/bbtab Sun, 27 Sep 2026 00:00:00 GMT Building BBTab — a small, native GTK4 tab editor for Linux where you click a fret and the note drops onto the staff. Open source, plain-JSON files, and blues-first. https://sebastjan-rijavec.github.io/blog/the-blues https://sebastjan-rijavec.github.io/blog/the-blues Sat, 26 Sep 2026 00:00:00 GMT Turning a guitar, an iRig and a Linux workstation into a virtual B.B. King rig — and rediscovering that tone still lives in the fingers. https://sebastjan-rijavec.github.io/blog/trio-from-rio-001 https://sebastjan-rijavec.github.io/blog/trio-from-rio-001 Sun, 13 Sep 2026 00:00:00 GMT The first episode of Trio From Rio. https://sebastjan-rijavec.github.io/blog/markov-decision-process https://sebastjan-rijavec.github.io/blog/markov-decision-process Thu, 25 Jun 2026 00:00:00 GMT Defining a task in Isaac Lab means specifying a Markov Decision Process - states, actions, transitions, rewards, and a discount factor. Seeing the MDP turns reward design from guesswork into deliberate craft. https://sebastjan-rijavec.github.io/blog/what-is-a-policy https://sebastjan-rijavec.github.io/blog/what-is-a-policy Thu, 25 Jun 2026 00:00:00 GMT A policy is the small neural network Isaac Lab trains - a function from observation to action, shipped as a checkpoint and then as portable TorchScript and ONNX files. https://sebastjan-rijavec.github.io/blog/isaac-sim-vs-isaac-lab https://sebastjan-rijavec.github.io/blog/isaac-sim-vs-isaac-lab Wed, 24 Jun 2026 00:00:00 GMT How NVIDIA's Omniverse, Isaac Sim, Isaac Lab, and Isaac ROS layer together into a single sim-to-real stack. https://sebastjan-rijavec.github.io/blog/a-love-letter-to-dutch-weather https://sebastjan-rijavec.github.io/blog/a-love-letter-to-dutch-weather Sun, 17 May 2026 00:00:00 GMT From Someone Who Has Stopped Trying https://sebastjan-rijavec.github.io/blog/dear-amsterdam https://sebastjan-rijavec.github.io/blog/dear-amsterdam Wed, 13 May 2026 00:00:00 GMT A word about one of the most likable cities in the world. https://sebastjan-rijavec.github.io/blog/chasing-thunderstorms https://sebastjan-rijavec.github.io/blog/chasing-thunderstorms Thu, 07 May 2026 00:00:00 GMT I've been filming thunderstorms from terraces and balconies for years. The same obsession that sends me out with a phone also ends up inside Unreal Engine. https://sebastjan-rijavec.github.io/blog/dolphins-alcaidesa https://sebastjan-rijavec.github.io/blog/dolphins-alcaidesa Thu, 07 May 2026 00:00:00 GMT On a May afternoon on the Costa del Sol, a pod of dolphins passed through the Strait of Gibraltar just off the La Alcaidesa golf course. This is what it looked like. https://sebastjan-rijavec.github.io/blog/experimenting-with-ar https://sebastjan-rijavec.github.io/blog/experimenting-with-ar Thu, 07 May 2026 00:00:00 GMT In 2019, before AR toolkits were mature, pointing a phone at your desk and watching something appear in the world felt genuinely strange. It still does. https://sebastjan-rijavec.github.io/blog/record-the-solution https://sebastjan-rijavec.github.io/blog/record-the-solution Thu, 07 May 2026 00:00:00 GMT A short screen recording does more for your colleagues than any written tutorial. Here's why it's worth making a habit of. https://sebastjan-rijavec.github.io/blog/ryot-augmented-reality https://sebastjan-rijavec.github.io/blog/ryot-augmented-reality Thu, 30 Apr 2026 00:00:00 GMT How our RYOT group brought augmented and virtual reality into retail — and genuinely changed how people shop. https://sebastjan-rijavec.github.io/blog/weeds-and-strawberries https://sebastjan-rijavec.github.io/blog/weeds-and-strawberries Mon, 27 Apr 2026 00:00:00 GMT A short observation on why the plants you want are hard and the plants you don't are not. https://sebastjan-rijavec.github.io/blog/procedural-sun https://sebastjan-rijavec.github.io/blog/procedural-sun Sun, 26 Apr 2026 00:00:00 GMT A pixel-art sun rendered entirely from a Houdini network — no painting, no hand-placed pixels. https://sebastjan-rijavec.github.io/blog/pats-pika-and-the-seagulls https://sebastjan-rijavec.github.io/blog/pats-pika-and-the-seagulls Mon, 20 Apr 2026 00:00:00 GMT A completely unnecessary game born from one seagull, one dog, and one very unfortunate afternoon. https://sebastjan-rijavec.github.io/blog/planet-of-lana https://sebastjan-rijavec.github.io/blog/planet-of-lana Sat, 11 Apr 2026 00:00:00 GMT A small team made one of the most visually striking games in years. It shows in every single frame. https://sebastjan-rijavec.github.io/blog/hedgehog-poo https://sebastjan-rijavec.github.io/blog/hedgehog-poo Fri, 28 Jul 2023 00:00:00 GMT My wife summoned me to the garden. What followed was an unexpected deep-dive into the surprisingly well-documented world of hedgehog droppings. https://sebastjan-rijavec.github.io/blog/hello-world https://sebastjan-rijavec.github.io/blog/hello-world Wed, 12 Jun 2019 00:00:00 GMT First post — a test of the blog setup and a quick hello.