Štefan Urbánek
@stiivi.bsky.social
Software engineer, metamodeller, data governance practitioner. Developing open architecture for systems dynamics and causality modelling: https://github.com/openpoiesis/
Past: Author of Data Brewery and Cubes
Past: Author of Data Brewery and Cubes
I was hoping to make a release preview of Poietic Playground (educational virtual laboratory for systems dynamics) this fall, however "it is just a minor change" turned into a significant refactoring which caused clash of three distinct architectures: MVC vs. Godot's Scene Tree vs. data oriented ECS
November 24, 2025 at 1:01 PM
I was hoping to make a release preview of Poietic Playground (educational virtual laboratory for systems dynamics) this fall, however "it is just a minor change" turned into a significant refactoring which caused clash of three distinct architectures: MVC vs. Godot's Scene Tree vs. data oriented ECS
Realising that Entity Component System is not a bad idea for a CAD-like application. Not even for performance purposes, but for modelling "of the modelling". Gives flexibility, extensibility, better separation of concerns for very negligible bureaucracy.
November 16, 2025 at 11:03 AM
Realising that Entity Component System is not a bad idea for a CAD-like application. Not even for performance purposes, but for modelling "of the modelling". Gives flexibility, extensibility, better separation of concerns for very negligible bureaucracy.
Computer beige aesthetics may be boring, but at least I know what I can push. Sorry, I am not a designer, you will not get anything better for the Systems Dynamics playground from me than this, which is better than pure black.
November 1, 2025 at 10:44 AM
Computer beige aesthetics may be boring, but at least I know what I can push. Sorry, I am not a designer, you will not get anything better for the Systems Dynamics playground from me than this, which is better than pure black.
New feature in Poietic Playground for Systems Dynamics: curve editing of a graphical function node. You can now set-up your custom prices, or weather temperature or cake cravings.
October 28, 2025 at 7:15 PM
New feature in Poietic Playground for Systems Dynamics: curve editing of a graphical function node. You can now set-up your custom prices, or weather temperature or cake cravings.
October update of Poietic Playground for Systems Dynamics: Colours for charts, debug window for the curious, some new maths. Slowly getting there...
October 27, 2025 at 8:45 PM
October update of Poietic Playground for Systems Dynamics: Colours for charts, debug window for the curious, some new maths. Slowly getting there...
Nothing beats paper. New geometry, diagram composer and SVG export integrated in the Poietic Playground app. Oh, and note the alternative jolly systems dynamics pictogram set. Soon-ish on main branch. (@swift.org extension in @godotengine.org).
September 21, 2025 at 11:08 PM
Nothing beats paper. New geometry, diagram composer and SVG export integrated in the Poietic Playground app. Oh, and note the alternative jolly systems dynamics pictogram set. Soon-ish on main branch. (@swift.org extension in @godotengine.org).
New diagram geometry backend in the works. Goal is to have common geometry for interactive apps and for generated image output. This is a test of touch points. (Generated output).
August 27, 2025 at 8:31 AM
New diagram geometry backend in the works. Goal is to have common geometry for interactive apps and for generated image output. This is a test of touch points. (Generated output).
Bathtub pictogram set; pictogram scaling and styling.
August 15, 2025 at 12:37 PM
Bathtub pictogram set; pictogram scaling and styling.
Poietic progress update: For our publishing pleasures, SVG export of stock-flow models has been prototyped.
August 13, 2025 at 12:50 PM
Poietic progress update: For our publishing pleasures, SVG export of stock-flow models has been prototyped.
Poietic sketch: ETL approach for foreign design representation. Will be used for imports, persistence and copy&paste. Tricky bits: preserve object identity, and revision(frame)-relative parent- child relationships.
May 28, 2025 at 7:22 AM
Poietic sketch: ETL approach for foreign design representation. Will be used for imports, persistence and copy&paste. Tricky bits: preserve object identity, and revision(frame)-relative parent- child relationships.
Reposted by Štefan Urbánek
After 18 months of gestation, Godot and SwiftUI had a baby!
Xogot is out now on the AppStore:
blog.la-terminal.net/xogot-godot-...
AppStore: apps.apple.com/us/app/xogot...
Xogot is out now on the AppStore:
blog.la-terminal.net/xogot-godot-...
AppStore: apps.apple.com/us/app/xogot...
Xogot: Godot for iPad - Available on the App Store
We’re thrilled to announce that Xogot, our native port of the Godot game engine for iPad, is now available on the Apple App Store!
Xogot brings the full power of Godot 4.4 to a touch-first, iPad-nati...
blog.la-terminal.net
May 6, 2025 at 4:00 PM
After 18 months of gestation, Godot and SwiftUI had a baby!
Xogot is out now on the AppStore:
blog.la-terminal.net/xogot-godot-...
AppStore: apps.apple.com/us/app/xogot...
Xogot is out now on the AppStore:
blog.la-terminal.net/xogot-godot-...
AppStore: apps.apple.com/us/app/xogot...
Here are two diagrams about how the computation in the Poietic stock-and-flow simulation works. Complications resolved in this process: constraints (non-negativity), dependent variables (auxiliaries and flow rates might depend computationally), delays (not depicted, included in aux).
April 25, 2025 at 3:37 PM
Here are two diagrams about how the computation in the Poietic stock-and-flow simulation works. Complications resolved in this process: constraints (non-negativity), dependent variables (auxiliaries and flow rates might depend computationally), delays (not depicted, included in aux).
Oscillation of content between two containers. I finally rewrote the primordial computation that did not allow cycles of flows between non-negative stocks. New differentiation uses flow rates with adjustments, as it should. Might be worth a longer post.
April 22, 2025 at 11:57 PM
Oscillation of content between two containers. I finally rewrote the primordial computation that did not allow cycles of flows between non-negative stocks. New differentiation uses flow rates with adjustments, as it should. Might be worth a longer post.
New feature: Simulation result panel with live-updated pinned charts. One small step towards smooth experimentation.
April 8, 2025 at 11:44 AM
New feature: Simulation result panel with live-updated pinned charts. One small step towards smooth experimentation.
"Hello Interest!" and hello on-canvas formula and name editing.
April 4, 2025 at 7:26 AM
"Hello Interest!" and hello on-canvas formula and name editing.
So smooth ... Playing with smoothing nodes of different window sizes. (Soon it will be possible to set it in the GUI).
March 27, 2025 at 10:45 AM
So smooth ... Playing with smoothing nodes of different window sizes. (Soon it will be possible to set it in the GUI).
Poietic playground status update: Unpolished, flickering, but working. Simulation is running and one can see glimpses of charts.
March 20, 2025 at 2:23 PM
Poietic playground status update: Unpolished, flickering, but working. Simulation is running and one can see glimpses of charts.
Prototype of an architecture for the Poietic modelling and simulation playground. Application written in @godotengine.org, backend in @swift.org. Thanks @migueldeicaza.bsky.social for the SwiftGodot package that glues the two together. The combination of the three works reasonably well.
March 4, 2025 at 5:16 PM
Prototype of an architecture for the Poietic modelling and simulation playground. Application written in @godotengine.org, backend in @swift.org. Thanks @migueldeicaza.bsky.social for the SwiftGodot package that glues the two together. The combination of the three works reasonably well.
Updated data model diagrams of Poietic Architecture – Core and Flows. Now with diagram sources in @OmniGraffle. github.com/OpenPoiesis/...
December 17, 2024 at 4:15 PM
Updated data model diagrams of Poietic Architecture – Core and Flows. Now with diagram sources in @OmniGraffle. github.com/OpenPoiesis/...
"Look, it is already somewhat useable" said a friend to me, so here it is, a preview of a hobby project of mine: Open Poiesis – building blocks of a virtual laboratory for systems thinking, modelling and simulation. More stories and diagrams to come.
Introduction: www.poietic.org/blog/introdu...
Introduction: www.poietic.org/blog/introdu...
October 25, 2024 at 9:03 PM
"Look, it is already somewhat useable" said a friend to me, so here it is, a preview of a hobby project of mine: Open Poiesis – building blocks of a virtual laboratory for systems thinking, modelling and simulation. More stories and diagrams to come.
Introduction: www.poietic.org/blog/introdu...
Introduction: www.poietic.org/blog/introdu...