Execution Engine — More Reliable Vehicle Control​

v0.0.2 brings key improvements to several drive action modifiers:

• Change lane (change_lane): No longer relies on the internal tracing system — lane changes are handled directly and more reliably. The simulation engine now supports smooth lane changes with no instant jumps.
• Speed: Fixed a calculation anomaly in the dynamic solver and added safety strategies to prevent unrealistic speed values.
• Position: Now supports specifying following distance by time (time: parameter) — distance is automatically calculated based on vehicle speed at runtime.
• Road selection: Random road selection has been replaced with iterative verification, preventing placement failures on roads that are too short.
• Cross-road distance: New cross-road distance calculation eliminates distance errors when vehicles change lanes across road boundaries.

Initial vehicle placement has also been improved — when multiple vehicles maintain following distances, the system performs a holistic analysis of all constraints to ensure every vehicle gets a valid position.

Frontend — Landing Page Restructure​

The frontend now supports a three-entry-point structure:

• English landing page / — default entry
• Chinese landing page /zh/ — for Chinese-speaking users
• Application page /app/ — the main editor

The default language has been switched from Chinese to English. Language preference is remembered automatically across visits.

Performance — Faster Page Load​

This release also brings significant performance improvements that make the website load noticeably faster:

• Efficient asset compression: All JavaScript, CSS, and static files are now compressed using one of the web's most efficient compression algorithms. File sizes are reduced by over 70%, so pages load in a fraction of the previous time.
• Smaller demo videos: The demo videos on the landing page have been re-encoded, reducing file sizes by over 70% with no visible quality loss. Videos start playing faster, especially on slower connections.

Execution Engine — Run Scenarios Online​

v0.0.1 introduces the initial execution engine. You can now run scenarios directly from the editor with one click and see the results in real-time preview.

Currently supported:

• Scenario elements: vehicle, map and other basic element parsing and loading
• Drive action: Execution of the drive action
• Modifiers: Support for speed, lane, position and other modifiers

This is the first step — the execution engine is actively evolving.

Code Completion — Syntax Tree Driven Context Completion​

The editor now features syntax tree driven context completion. Based on the cursor position, the grammar tree automatically lists valid candidate keywords, helping you write scenarios more efficiently and reducing the need to reference documentation.

Integration & Optimization — Faster Loading, Smoother Experience​

Syntax checking, scenario preview, and code completion used to be handled by separate modules, each requiring repeated loading. Now they are integrated — the parsed syntax tree is reused across features, resulting in noticeably faster page loading and a smoother overall experience.

The preview experience has been improved too:

• No more keyboard capture: Close the preview and keyboard input returns to the editor immediately. No browser restart needed.
• No more stretched display: Correct aspect ratio — what you see is what you get.
• Vehicle models in preview: Ego vehicle in white, NPCs in red — previews look more realistic
• Map auto-sync: .xodr files from your workspace are automatically synced. No more "map not found" errors.

Editor Experience, Refreshed​

Better Syntax Highlighting — Code Structure at a Glance​

Syntax highlighting has been improved. Different syntax elements are now color-coded, making the code structure clearer and easier to read:

Coloring also added for .. (range operator), ? (ternary), ! (enum delimiter), and keywords including call, emit, range, it, default, hard.

The editor theme now follows the app's dark/light toggle — switch to dark mode and the editor switches to a dark color scheme seamlessly.

Workspace, Now Smoother​

• Auto-generated main.osc: No more staring at an empty file list on first visit
• Right-click context menu: Copy full file names with one click
• Hover tooltip: Long filenames show their full path on hover
• Delete moved to context menu: Removed the one-click delete button to prevent accidents

Documentation Site Goes Live​

A brand new documentation site is now live, featuring two sections:

• User Manual: From quick start to scenario authoring, step by step
• OpenSCENARIO 2 Reference: Complete language syntax, type system, and validation rules

Available in both Chinese and English, with built-in search for quick reference.

What's Inside​

• User Manual — From quick start to scenario authoring, step-by-step guidance on mastering OSC2 Studio
• OpenSCENARIO2 Reference — Complete coverage of language overview, syntax rules, type system, and validation

Whether you're new to OSC2 or an experienced scenario designer, you'll find the resources you need here.

Happy browsing, and stay tuned for more updates!