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# Config File Improvements & Main.cpp Refactoring |
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**Date:** 2026-01-03 |
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## Overview |
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This session focused on refactoring main.cpp into smaller functions and adding support for eccentric orbits through an extended configuration file format. |
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## Changes Made |
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### 1. Main.cpp Refactoring |
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Broke down 215-line main() function into focused, reusable functions: |
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**New Functions:** |
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- `parse_command_line_args()` - Parse CLI args into ProgramArgs struct |
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- `print_startup_info()` - Display simulation configuration |
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- `run_headless_simulation()` - Terminal-based simulation with state capture |
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- `run_gui_simulation()` - 3D visualization mode |
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**Result:** main() now only ~25 lines (setup and dispatch) |
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**Additional Improvements:** |
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- Added initial state capture in headless mode |
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- Initial state now printed both at start AND end for comparison |
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- Cleaner separation of concerns |
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### 2. Eccentric Orbit Support |
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Extended config format from 10 to 12 fields: |
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**Old Format (10 fields):** |
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``` |
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name mass radius x y z parent_index r g b |
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``` |
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**New Format (12 fields):** |
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``` |
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name mass radius x y z parent_index r g b eccentricity semi_major_axis |
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``` |
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**Implementation:** |
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- Uses vis-viva equation: `v = sqrt(G*M*(2/r - 1/a))` |
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- Circular orbits: e=0, a=orbital_radius |
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- Elliptical orbits: e>0, a=semi_major_axis |
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- Unified code path for both orbit types |
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**Example Configurations:** |
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``` |
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# Circular orbit |
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Earth 5.972e24 6.371e6 1.496e11 0 0 0 0.0 0.5 1.0 0 1.496e11 |
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# Eccentric orbit (e=0.7) |
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Comet 1e14 5e3 1.122e11 0 0 0 0.5 0.8 1.0 0.7 3.74e11 |
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``` |
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### 3. Code Simplification |
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- Removed dual format parsing (now single unified format) |
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- Shortened function name: `calculate_initial_velocities_with_params()` → `calculate_velocities()` |
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- Removed `OrbitParams.has_params` field (always have params now) |
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- Cleaner velocity calculation logic |
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### 4. Testing |
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Created test_simple.txt with eccentric comet: |
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- Eccentricity: 0.7 |
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- Semi-major axis: 2.5 AU |
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- Perihelion: 0.75 AU |
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- Aphelion: 4.25 AU |
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**Test Results:** |
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- ✓ Initial velocity: 44.849 km/s (matches theoretical) |
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- ✓ Position varies from 0.75 AU to ~3.8 AU over simulation |
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- ✓ Velocity varies from 44.8 km/s (perihelion) to 10.6 km/s (aphelion) |
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- ✓ Energy conservation maintained |
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### 5. Documentation Updates |
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**README.md:** |
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- Updated config format section with 12-field format |
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- Added examples for both circular and eccentric orbits |
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- Added "Eccentric orbit support" to features list |
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- Updated field descriptions |
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**docs/config_assumptions.md:** |
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- Documented fixed issues (eccentric orbits, main.cpp refactoring) |
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- Updated format assumptions (10 → 12 fields) |
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- Added prioritized TODO list |
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- Added session notes with detailed change log |
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## Git Commits |
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1. `e5da7aa` - Refactor main.cpp into focused functions |
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- Extracted argument parsing, headless sim, GUI sim |
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- Added initial state capture for comparison |
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2. `17f11bb` - Add eccentric orbit support with unified config format |
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- Extended format to 12 fields |
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- Implemented vis-viva equation |
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- Added example comet configuration |
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3. `8b9a06e` - Update documentation for eccentric orbit support |
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- Updated README with new format |
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- Updated config_assumptions.md |
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4. `61ac1c5` - Add session notes and TODOs to config documentation |
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- Documented all session changes |
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- Created prioritized action items |
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## Files Modified |
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**Source Code:** |
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- src/main.cpp (refactored into functions) |
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- src/config_loader.cpp (added orbit parameters support) |
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**Configuration:** |
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- configs/test_simple.txt (updated to 12-field format + comet) |
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**Documentation:** |
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- README.md (new format examples) |
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- docs/config_assumptions.md (status updates + TODOs) |
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## Known Issues & TODOs |
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**HIGH PRIORITY:** |
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- [ ] Update configs/solar_system.txt to new 12-field format |
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- [ ] Update configs/example_binary_star.txt to new 12-field format |
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- [ ] Fix Moon position in solar_system.txt |
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- Current: (1.500e11, 0, 0) - 4 million km from Earth |
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- Should: (~1.496e11 + 3.844e8, 0, 0) - 384,400 km from Earth |
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- [ ] Fix Jupiter's moons positions (same issue as Moon) |
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**MEDIUM PRIORITY:** |
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- [ ] Add config file validation |
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- [ ] Document coordinate system clearly (absolute vs relative) |
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**LOW PRIORITY:** |
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- [ ] Consider relative coordinate option for child bodies |
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- [ ] Add 3D orbit support (currently XY plane only) |
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## Technical Notes |
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### Vis-Viva Equation |
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``` |
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v = sqrt(G*M*(2/r - 1/a)) |
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``` |
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Where: |
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- v = orbital velocity at current position |
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- G = gravitational constant |
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- M = parent body mass |
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- r = current distance from parent |
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- a = semi-major axis of orbit |
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**For circular orbits (e=0):** |
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- r = a (constant) |
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- Equation simplifies to: `v = sqrt(G*M/r)` |
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**For eccentric orbits (e>0):** |
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- At perihelion (r = a(1-e)): velocity is maximum |
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- At aphelion (r = a(1+e)): velocity is minimum |
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- Demonstrates Kepler's 2nd law (equal areas in equal times) |
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**Orbital Period:** |
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``` |
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T = 2π * sqrt(a³/GM) |
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``` |
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Example for comet (a=2.5 AU): T ≈ 1444 days |
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## Testing Commands |
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**Build:** |
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```bash |
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make |
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``` |
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**Run with default config (currently test_simple.txt):** |
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```bash |
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./orbit_sim |
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``` |
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**Run headless for 1000 days:** |
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```bash |
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./orbit_sim --days 1000 |
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``` |
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**Run with specific config:** |
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```bash |
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./orbit_sim configs/test_simple.txt |
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``` |
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**Run headless with readable units:** |
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```bash |
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./orbit_sim --headless --readable --days 365 |
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``` |
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## Next Session Recommendations |
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1. Update remaining config files to 12-field format |
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2. Fix moon positions with correct physics |
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3. Test updated configurations |
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4. Consider adding config validation warnings |
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5. Possibly add argument of periapsis parameter for 3D orbit orientation |
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@ -0,0 +1,50 @@ |
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# Documentation Condensing Session (2026-01-04) |
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## Changes Made: |
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### 1. Condensed implementation_plan.md (236→112 lines) |
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- Renamed to "Technical Reference" |
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- Updated data structures to match actual code (added eccentricity, semi_major_axis, max_bodies, RenderState) |
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- Replaced detailed implementation steps with completed/remaining status |
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- Removed redundant function lists (already in headers) |
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- Added user's note about Newton-Raphson propagation method |
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### 2. Condensed test_verification.md (143→62 lines) |
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- Updated for current test_simple.txt (4 bodies including eccentric comet) |
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- Removed detailed step-by-step verification points |
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- Kept essential: test command, expected behavior, tolerances |
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### 3. Condensed config_assumptions.md (115→44 lines) |
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- Removed redundant format documentation (already in README.md) |
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- Removed verbose session notes and code references |
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- Focused on active TODOs and known bugs only |
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### 4. Removed architecture duplication from CLAUDE.md |
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- Removed ~70 lines of detailed architecture (duplicate of verbose_project_overview.md) |
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- Now points to verbose_project_overview.md for technical details |
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- Added `make test` to common commands |
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### 5. Removed common commands from verbose_project_overview.md |
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- Commands now only in CLAUDE.md (single source) |
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- Remains canonical technical architecture reference |
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### 6. Added test target to Makefile |
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- `make test` runs: `./orbit_sim configs/test_simple.txt --headless --readable --days 365` |
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## File Purposes Established |
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- **README.md**: User-facing guide |
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- **CLAUDE.md**: Concise Claude guidance + commands |
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- **docs/verbose_project_overview.md**: Canonical technical architecture |
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- **docs/implementation_plan.md**: Data structures reference |
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- **docs/config_assumptions.md**: Active issues & TODOs |
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- **docs/test_verification.md**: Test reference |
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## Commits |
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- `af1b54b` Condense and deduplicate project documentation |
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## Results |
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Net reduction: 278 lines removed (6 files changed, +132/-410) |
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Documentation now DRY with clear separation of concerns. |
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