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BREAKING CHANGE: Timeline format now uses beats as default unit
## Core Changes
**Uniform Structure (32 bytes maintained):**
- Added `beat_time` (absolute beats for musical animation)
- Added `beat_phase` (fractional 0-1 for smooth oscillation)
- Renamed `beat` → `beat_phase`
- Kept `time` (physical seconds, tempo-independent)
**Seq Compiler:**
- Default: all numbers are beats (e.g., `5`, `16.5`)
- Explicit seconds: `2.5s` suffix
- Explicit beats: `5b` suffix (optional clarity)
**Runtime:**
- Effects receive both physical time and beat time
- Variable tempo affects audio only (visual uses physical time)
- Beat calculation from audio time: `beat_time = audio_time * BPM / 60`
## Migration
- Existing timelines: converted with explicit 's' suffix
- New content: use beat notation (musical alignment)
- Backward compatible via explicit notation
## Benefits
- Musical alignment: sequences sync to bars/beats
- BPM independence: timing preserved on BPM changes
- Shader capabilities: animate to musical time
- Clean separation: tempo scaling vs. visual rendering
## Testing
- Build: ✅ Complete
- Tests: ✅ 34/36 passing (94%)
- Demo: ✅ Ready
handoff(Claude): Beat-based timing system implemented. Variable tempo
only affects audio sample triggering. Visual effects use physical_time
(constant) and beat_time (musical). Shaders can now animate to beats.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Update all doc references from old paths to workspace structure:
- assets/demo.seq → workspaces/main/timeline.seq
- assets/music.track → workspaces/main/music.track
- assets/final/demo_assets.txt → workspaces/main/assets.txt
- assets/test_demo.* → workspaces/test/*
Files updated:
- HOWTO.md: Add workspace selection, update paths
- SEQUENCE.md: Update examples and integration
- ASSET_SYSTEM.md: Workspace-aware workflow
- CONTRIBUTING.md: Workspace timeline paths
- ARCHITECTURE.md: Generic workspace reference
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Consolidated and streamlined all documentation:
**Merged:**
- PROCEDURAL.md → deleted (content in ASSET_SYSTEM.md)
- FETCH_DEPS.md → BUILD.md (dependencies section)
**Simplified (line reductions):**
- HOWTO.md: 468→219 (53%)
- CONTRIBUTING.md: 453→173 (62%)
- SPECTRAL_BRUSH_EDITOR.md: 497→195 (61%)
- SEQUENCE.md: 355→197 (45%)
- CONTEXT_MAINTENANCE.md: 332→200 (40%)
- test_demo_README.md: 273→122 (55%)
- ASSET_SYSTEM.md: 271→108 (60%)
- MASKING_SYSTEM.md: 240→125 (48%)
- 3D.md: 196→118 (40%)
- TRACKER.md: 124→76 (39%)
- SCENE_FORMAT.md: 59→49 (17%)
- BUILD.md: 83→69 (17%)
**Total:** 3344→1657 lines (50.4% reduction)
**Changes:**
- Removed verbose examples, redundant explanations, unimplemented features
- Moved detailed task plans to TODO.md (single source of truth)
- Consolidated coding style rules
- Kept essential APIs, syntax references, technical details
**PROJECT_CONTEXT.md:**
- Added "Design Docs Quick Reference" with 2-3 line summaries
- Removed duplicate task entries
- All design docs now loaded on-demand via Read tool
Result: Context memory files reduced from 31.6k to ~15k tokens.
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Improvements to seq_compiler Gantt chart visualization:
- Add optional sequence name support: SEQUENCE <start> <pri> ["name"] [end]
Names displayed in both ASCII and HTML Gantt charts for better readability
- Implement adaptive tick intervals based on demo duration:
* ≤5s: 1s intervals
* ≤40s: 2s intervals (fixes 32.5s demo from 5s to 2s)
* ≤100s: 5s intervals
* >100s: 10s+ intervals
- Sort sequences by start time in Gantt output for chronological visualization
- Add horizontal visual separators between sequences in both ASCII and HTML
- Update documentation (SEQUENCE.md) and quick reference (demo.seq)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Simplifies effect priority management by using relative modifiers instead
of explicit numbers, making timeline reordering much more practical.
## New Priority System
Effects now use priority modifiers after EFFECT keyword:
- `+` increment priority by 1 (or start at 0 if first)
- `=` keep same priority as previous effect
- `-` decrement priority (or start at -1 if first, for background)
Old syntax:
```
EFFECT FlashEffect 0.0 0.5 0
EFFECT FadeEffect 0.1 0.3 1
EFFECT BgCube 0.2 3 -1
```
New syntax:
```
EFFECT - BgCube 0.2 3 # Priority -1 (background)
EFFECT + FlashEffect 0.0 0.5 # Priority 0
EFFECT + FadeEffect 0.1 0.3 # Priority 1
```
## Benefits
✓ Reordering effects no longer requires renumbering all priorities
✓ Priority relationships are explicit and relative
✓ File order matches render order (easier to understand)
✓ Same-priority effects clearly marked with `=`
✓ Background layers (-1) clearly marked with `-`
✓ Reduces errors when reorganizing timelines
## Implementation
- Updated seq_compiler to parse +/=/- modifiers
- Tracks current priority per sequence
- First effect sets base priority (0 or -1)
- Subsequent effects modify relative to previous
- Generated C++ code unchanged (still uses integer priorities)
## Changes to demo.seq
- All effects updated to use new syntax
- Effects reordered by priority within sequences
- Priority gaps removed (were likely unintentional)
- Comments updated to reflect new system
## Documentation
- Updated SEQUENCE.md with new syntax
- Added examples showing +, =, - usage
- Explained priority calculation rules
This makes timeline authoring significantly more maintainable, especially
when experimenting with different effect orderings during development.
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Moves comprehensive sequence system documentation out of demo.seq into
a proper documentation file, keeping the timeline file clean and focused.
Changes:
- New file: doc/SEQUENCE.md with complete .seq format reference
- Streamlined: assets/demo.seq reduced from 207 to 104 lines
- Updated: README.md to include SEQUENCE.md reference
Benefits:
- Easier to read and navigate the actual timeline
- Documentation separately viewable in markdown
- Better for version control (timeline vs doc changes separated)
- Follows project convention of dedicated doc files
- Makes demo.seq more approachable for quick edits
The timeline file is now 50% smaller while all documentation remains
easily accessible in the standard doc/ directory.
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