Version 0.2.0

Lempo Particle Editor v0.2.0

Design 2D & 3D particle effects visually — and play them in GDevelop.

Trails & Ribbons · Rebuilt 2D zoom · New Lempo brand

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🧩 Compatibility

Effect format	v1.1 (v1.0 files are migrated automatically)
GDevelop extension	Pairs with Advanced Particle Emitter v0.2.0
Platform	Windows 10/11 (64-bit), GPU with OpenGL 3.3

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✨ Highlights

• 🎀 Trails & Ribbons — a full ribbon system with a Unity-style inspector, 27 ready-made templates, and Godot-style distance emission.
• 🎮 In-game trails — the Advanced Particle Emitter extension v0.2.0 renders exported trail effects as ribbons inside GDevelop (2D and 3D).
• 🌐 Fast preview now renders trails in 2D and 3D and hides the particle dots, exactly like the editor.
• 🔍 Rebuilt 2D zoom — world-space simulation with cursor-anchored zoom.
• 🥕 New Lempo brand (formerly Carrot Particle Editor) — new name, icon, and topbar.

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🆕 Added

🎀 Trails & Ribbons

• 4 editor modes from the startup dialog (keys 2 / 3 / 4 / 5): 2D / 3D particles plus 2D / 3D Trails & Ribbons.
• TRAIL_SCHEMA (79 keys) with a foldout inspector: Trail / Shape / Color / Texture / Per-Particle / Lighting & Sorting / Tools & Motion — curve and gradient editors, drag-labels, steppers, per-section reset and copy/paste.
• 27 templates across combat, magic, movement, nature, and stylized, with a template browser (search, favorites, recent, and your own saved presets).
• Emit modes:
  • time — classic lifetime trails.
  • distance — fixed sections × section length, speed-independent, Godot-style (0 = every-frame tick).
• Ribbon look — glow + edge + core strips, gradient colors, width curves, flicker, taper, and screen-width floor.
• Display modes — trail mode shows ribbons only; an optional hybrid mode keeps dots + ribbons.

2D Trails	3D Trails

🎮 In-game (GDevelop extension v0.2.0)

Exported trail effects render as ribbons inside GDevelop — 2D quad strips and 3D billboard strips, pooled and blend-aware, with hideParticle honored. No new objects are needed: the existing emitters gain trail support, and effects without trails render exactly as before.

🌐 Fast preview

The browser preview now draws the same ribbons (Three.js in 3D, PixiJS in 2D) and hides dots in trail mode, with 500 ms live-sync.

2D Fast Preview	3D Fast Preview

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⚡ Improved

2D viewport

• Simulation moved to world space — panning never strands old particles, and zoom anchors correctly (cursor-anchored wheel, centered Q / E keys).
• The purple splitter bar between the settings panel and the viewport drags reliably again.

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🐛 Fixed

Issue	Cause / Fix
Templates showed orange dots	9 templates carried a hybrid flag and the apply path didn't enforce ribbons-only. All 27 templates are now verified ribbons-only in 2D and 3D, and applying a template can never bring dots back.
Fast preview showed particles in trail mode	The preview ignored the trails block entirely.
Shortcut kept the old icon	Windows held a stale cached bitmap. The icon now lives at a fresh path (assets/lempo.ico) and every rebuild refreshes the icon cache.

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📦 Downloads

File	Description
LempoParticleEditor.exe	Windows editor. No Python installation required.
AdvancedParticleEmitter.json	GDevelop extension (v0.2.0). Import it into your GDevelop project.

Requirements: Windows 10/11 (64-bit) · GPU with OpenGL 3.3

Full changelog: v0.1.2...v0.2.0

Version 0.1.2

Carrot Particle Editor v0.1.2

A standalone Dear PyGui editor and GDevelop extension for authoring 2D/3D particle effects.
Effect format v1.1 (v1.0 files are migrated automatically).

Highlights

• Up to ~48× fewer draw calls in 3D via GPU instancing (~580 → ~12), with pixel-identical output.
• New blend modes: Screen, Lighten, and Overlay.
• Deterministic playback with a per-effect seed.
• New force fields: turbulence, vortex, attractor, and a collision plane.

Added

Editor

• Deterministic seed for identical replay across platforms (0 keeps legacy behavior).
• Force fields (all disabled by default): turbulence, Y-axis vortex, attractor, and a collision plane with bounce and friction.
• Effect format v1.1 with schema validation and automatic migration from v1.0.
• Sample effect: sample_blend_layers.json.

Blend modes

• Screen (2D + 3D), Lighten (3D, max equation), Overlay (2D).
• Unsupported modes fall back to Normal and log a single warning.
• Per-emitter blendingMode, selectable from the sidebar dropdown.
  Setting the object's 'JSON' option uses each emitter's own mode; any explicit value overrides all emitters.

Improved

3D runtime performance

• InstancedMesh batching: ~580 draw calls reduced to ~12 buckets. Output is verified pixel-identical per particle (matrix, color, alpha), including morph flips and all blend modes.
• Buckets are created lazily per shape in use; empty buckets add no draw calls.
• Leaner sampling: static tracks are skipped and colors are pre-parsed, with no visual change.
• Mesh and material pooling, shared geometries, and zero per-frame allocations in steady state.
• Automatic fallback to the classic rendering path when instancing is unavailable.

Fixed

• Extension crash on adding an object: helper definitions ran before var F was initialized, causing a TypeError on the first frame.
• Export / Save / Open did nothing: Dear PyGui dialogs returned empty payloads. The editor now uses native OS file dialogs.
• 3D Subtractive blend was silently rendering as Normal because of a wrong THREE constant.
• Incorrect GL constant: ONE_MINUS_SRC_COLOR was mapped to ONE_MINUS_DST_COLOR (found by the new pixel-comparison tests).

Downloads

File	Description
CarrotParticleEditor.exe	Windows build. No Python installation required.
AdvancedParticleEmitter.json	GDevelop extension. Import it into GDevelop/Carrots. Each effect uses a ParticleJSON resource plus a Models GLB resource.

Version 0.1.1

Standalone Dear PyGui editor + GDevelop extension (AdvancedParticleEmitter.json, v0.1.1) for 2D/3D particle effects.

Custom 3D models
Upload .glb / .gltf / .obj — models render as themselves in the viewport, the fast preview, and in-game. The node picker lists only mesh-bearing nodes; rigged (skinned) models are baked to their rest pose automatically.

Shape morph
Birth → death shapes now cross-fade around the mid-segment flip instead of snapping (editor viewport + browser preview; the game runtime keeps the classic flip).

Browser fast preview
Same effect, live in three.js (3D) / pixi.js (2D) with 500ms live-sync — no network fetches.

Editor panels
Emitter zones, propagation cone, per-state colors (white = natural materials), and ready-made templates (Explosion / Fire / Rain / Snow).

2D & 3D shape lists

GDevelop setup
Import AdvancedParticleEmitter.json into your project.
Export your effect as .json from the editor and add it as a ParticleJSON resource.
If the effect uses a custom model, add the .glb as a Models GLB resource.
Add the emitter object to your scene and run.

Version 0.1.0

🥕 Carrot Particle Editor v0.1.0 — First Release

The first public release of Carrot Particle Editor and the Advanced Particle Emitter extension for GDevelop.

Highlights

• Visual particle effect editor with real-time GPU preview (OpenGL 3.3)
• 12 particle shapes shared between 2D (PixiJS) and 3D (Three.js) renderers
• Dual simulation core: Python reference + optional compiled C++ core (99/99 parity tests passing)
• Self-contained browser preview (live_effect.html)
• JSON export compatible with the GDevelop extension v1.0 format

What's included

• CarrotParticleEditor.exe — standalone Windows editor (no Python required)
• AdvancedParticleEmitter.json — GDevelop extension

Requirements

• Windows 10/11 (64-bit)
• GPU with OpenGL 3.3 support

Known limitations

• Windows only
• Extension action/condition documentation is still in progress

Feedback

Please report bugs or suggestions via Issues.