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Castle Game Engine

@castleengine

Open-source cross-platform (desktop, mobile, console, web) 3D and 2D game engine using modern Object Pascal. Support us on https://teapaw.org/t.co/HRxaVvGBQC

castle-engine.io/
Joined September 2014
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AnsiString vs Utf8String properly declared, Delphi: we no longer force AnsiString to UTF-8 castle-engine.io/wp/2026/09/… #GameDev #Delphi #Pascal #FreePascal #ObjectPascal #Unicode #OpenSource #CastleEngine
AnsiString vs Utf8String properly declared, Delphi: we no longer force AnsiString to UTF-8

AnsiString vs Utf8String properly declared, Delphi: we no longer force AnsiString to UTF-8

( This announcement is a bit non-exciting small improvement around the engine codebase. For something more exciting, that I was working on through September, see the screenshot attached here :), an…

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Everyone! Book a meeting with me to talk about Castle Game Engine castle-engine.io/wp/2026/09/… #GameDev #IndieDev #GameEngine #Pascal #OpenSource #Community #CastleEngine
Everyone! Book a meeting with me to talk about Castle Game Engine

Everyone! Book a meeting with me to talk about Castle Game Engine

Hey everyone! Use this Book a Meeting link to schedule a meeting with me (I’m Michalis Kamburelis, Castle Game Engine lead). Yes, I mean you. Do it right now. Don’t hesitate. Stop readi…

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Particle system updates (custom shaders, web support), FreeCAD -> X3D exporter, documentation (exe size, 2D, easy link to API), geometry shader fixes castle-engine.io/wp/2026/08/… #GameDev #IndieDev #Shaders #Particles #X3D #WebGL #Pascal #OpenSource #CastleEngine
Particle system updates (custom shaders, web support), FreeCAD -> X3D exporter, documentation (exe...

Particle system updates (custom shaders, web support), FreeCAD -> X3D exporter, documentation (exe...

Forgive us for a calm August without the usual weekly announcements, as Michalis spent most of the month on a family vacation. Stay tuned for an upcoming news post about a feature he made when his …

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Pointer lock (mouse look) on the web — plus a big refactor and Windows improvements castle-engine.io/wp/2026/08/… #GameDev #IndieDev #WebGL #HTML5 #Windows #Pascal #OpenSource #CastleEngine
Pointer lock (mouse look) on the web — plus a big refactor and Windows improvements

Pointer lock (mouse look) on the web — plus a big refactor and Windows improvements

Note that I sent a sneak preview of this news using Patreon Quip earlier this week. I plan to experiment with Quips more in the future. The “quips” are visible to everyone, you can inst…

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Toggle visibility of a group of X3D / glTF nodes castle-engine.io/wp/2026/07/… #GameDev #IndieDev #glTF #X3D #3DGraphics #Pascal #OpenSource #CastleEngine
Toggle visibility of a group of X3D / glTF nodes

Toggle visibility of a group of X3D / glTF nodes

We support now visible field on various X3D nodes: Inline node. This is when looking at the graph from Pascal. and on all X3DGroupingNode descendants, including Transform and Group. These are , , i…

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Web: water, terrain, shadow maps, alpha treatment, keys on losing focus castle-engine.io/wp/2026/07/… #GameDev #IndieDev #WebGL #HTML5 #Shaders #ShadowMapping #OpenSource #Pascal #CastleEngine
Web: water, terrain, shadow maps, alpha treatment, keys on losing focus

Web: water, terrain, shadow maps, alpha treatment, keys on losing focus

Rendering to texture (FBO, our ) works now on the web. This enables a few features on the web: Water, with reflections and waves, visible in the terrain demo (source code in examples/terrain/) is c…

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Windows downloads now code-signed – no more Smart App Control blocks. Plus smaller downloads (7z, tar.xz) castle-engine.io/wp/2026/07/… #GameDev #IndieDev #Windows #Pascal #FreePascal #Delphi #OpenSource #CastleEngine
Windows downloads now code-signed – no more Smart App Control blocks. Plus smaller downloads (7z,...

Windows downloads now code-signed – no more Smart App Control blocks. Plus smaller downloads (7z,...

Our downloads for Windows include now all the executables code-signed, which means that they are trusted and running the engine will raise fewer alarms from various Windows protection tools. In par…

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Delphi improvements: build tool uses msbuild, allows to pick Delphi version, better generated DPROJ, hints to fix PAServer on Linux and linking on macOS castle-engine.io/wp/2026/07/… #Delphi #Pascal #ObjectPascal #GameDev #IndieDev #Linux #macOS #OpenSource #CastleEngine
Delphi improvements: build tool uses msbuild, allows to pick Delphi version, better generated...

Delphi improvements: build tool uses msbuild, allows to pick Delphi version, better generated...

We improved how our engine tools (build tool and editor) call Delphi. These improvements take us closer to making our engine compatible with Delphi for Android, iOS and macOS and improve how you ca…

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Review of the engine by Claude Code yielded 11 bug-fixes. The good, the bad about the experience, how you can do this in your own codebase, Docker SBX and more castle-engine.io/wp/2026/06/… #ClaudeCode #AI #LLM #CodeReview #GameDev #Pascal #OpenSource #CastleEngine
Review of the engine by Claude Code yielded 11 bug-fixes. The good, the bad about the experience,...

Review of the engine by Claude Code yielded 11 bug-fixes. The good, the bad about the experience,...

I gave Claude a long-running task: Review every file of Castle Game Engine. The process found 11 “real” bugs (something was indeed a bug in the engine, and it could be a bug in real-lif…

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TCastleProcess and ExecuteCommand available with both FPC and Delphi, no more cryptic “Failed to execute : 4551” when Windows “Smart App Control” blocks us castle-engine.io/wp/2026/06/… #GameDev #IndieDev #Delphi #Pascal #FreePascal #Windows #OpenSource #CastleEngine
TCastleProcess and ExecuteCommand available with both FPC and Delphi, no more cryptic “Failed to...

TCastleProcess and ExecuteCommand available with both FPC and Delphi, no more cryptic “Failed to...

We refactored our process running code (when one application wants to run another). This is used throughout our tools (build tool, editor) but we also have uses for it in the engine itself. Refacto…

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Music Player example application, important fixes around audio and skinned animation castle-engine.io/wp/2026/06/… #GameDev #IndieDev #Audio #Animation #glTF #Android #OpenSource #Pascal #CastleEngine
Music Player example application, important fixes around audio and skinned animation

Music Player example application, important fixes around audio and skinned animation

We have a new example: Music Player, a simple application that allows to play a chosen audio track with UI similar to typical mobile music/audiobook players. This example has a nice backstory: For …

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Web: bump mapping, clip planes, fog, terrain, occlusion culling; also Unholy Society demo on web updated castle-engine.io/wp/2026/05/… #GameDev #IndieDev #WebGL #HTML5 #Shaders #OpenSource #Pascal #FreePascal #CastleEngine
Web: bump mapping, clip planes, fog, terrain, occlusion culling; also Unholy Society demo on web...

Web: bump mapping, clip planes, fog, terrain, occlusion culling; also Unholy Society demo on web...

Shaders on web fixes: Our shaders on the web platform can render now all our effects: Bump mapping (normal maps). As shown by demos: bump_mapping (source code). creature_behaviors (source code). th…

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Audio (sound, music) on the web, sound API improvements (arbitrary channels, float frequency etc.) castle-engine.io/wp/2026/05/… #GameDev #IndieDev #WebAudio #HTML5 #OpenSource #Pascal #FreePascal #CastleEngine
Audio (sound, music) on the web, sound API improvements (arbitrary channels, float frequency etc.)

Audio (sound, music) on the web, sound API improvements (arbitrary channels, float frequency etc.)

We have implemented audio playback on the web. Underneath we use WebAudio API but you don’t really need to know anything about it — just use Castle Game Engine sound API and components …

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More April News: training timer demo, delayed view changes, URL processing on save, how to easier install web compiler, notes on copyright and AI, in progress: audio on web castle-engine.io/wp/2026/05/… #castleengine #pascal #delphi #FPC #WebAssembly
More April News: training timer demo, delayed view changes, URL processing on save, how to easier...

More April News: training timer demo, delayed view changes, URL processing on save, how to easier...

We already announced some new features in April (PLY, InlineGeometry, web: URL parameters and TCastleDownload). Below we report more goodies :) Enjoy! Check out Training Timer 2: Zero Time project …

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Web target: getting URL parameters, downloading resources using TCastleDownload castle-engine.io/wp/2026/04/… #castleengine #FPC #WebAssembly #pascal #delphi
Web target: getting URL parameters, downloading resources using TCastleDownload

Web target: getting URL parameters, downloading resources using TCastleDownload

We add 2 new features to our web target: New methods to read URL through which your page was accessed, and get query parameters of this URL. The use-case is creating webpages that react to URL para…

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Support for PLY model format and InlineGeometry node castle-engine.io/wp/2026/04/… #castleengine #X3D #3D #FPC #Delphi #gamedev
Support for PLY model format and InlineGeometry node

Support for PLY model format and InlineGeometry node

We support now loading models in PLY format, commonly used for 3D scanning and printing. We support all common variants, which means ASCII and binary with any endianness. We support both models wit…

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PasDoc 1.0.0 release with with many features and fixes: modern HTML look, show source position, visibility of membes toggleable, show inherited members… castle-engine.io/wp/2026/03/… #pascal #delphi #FPC #lazarus #ObjectPascal
PasDoc 1.0.0 release with with many features and fixes: modern HTML look, show source position,...

PasDoc 1.0.0 release with with many features and fixes: modern HTML look, show source position,...

This a bit non-standard news post: I wanted to announce a new release of PasDoc, documentation generator we use to create Castle Game Engine API docs. PasDoc is a documentation generator for Pascal…

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Tower Fight game by Phomm, various engine fixes (GTK 3 and Wayland, float textures and Skin and web, macOS editor…) and website updates castle-engine.io/wp/2026/03/… #castleengine #wasm #gtk #wayland #fpc #pascal #delphi
Tower Fight game by Phomm, various engine fixes (GTK 3 and Wayland, float textures and Skin and...

Tower Fight game by Phomm, various engine fixes (GTK 3 and Wayland, float textures and Skin and...

Phomm posted about a cool new game he made in our forum: Tower Fight – Samurai Arcade for testing math skills. Available for various platforms including web. I recommend also his accompanying…

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AI usage guidelines and thoughts updated, and… test of vibe-coding with Castle Game Engine castle-engine.io/wp/2026/02/… #gamedev #ai #claude #pascal #delphi #fpc #castleengine
AI usage guidelines and thoughts updated, and… test of vibe-coding with Castle Game Engine

AI usage guidelines and thoughts updated, and… test of vibe-coding with Castle Game Engine

As most of us, I spend lately considerable amount of time researching and talking about AI implications (for coding and beyond). It’s a big subject. The technology offers us various applicati…

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Upgrade to GTK 3 castle-engine.io/wp/2026/02/… #castleengine #gamedev #gtk #fpc #pascal
Upgrade to GTK 3

Upgrade to GTK 3

We are upgrading our engine usage on Linux and FreeBSD from GTK 2 to GTK 3. Our installation instructions and scripts include now information to add GTK 3 packages. This is as simple as installing …

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