diff --git a/docs/sessions/2026-01-03-config-improvements.md b/docs/sessions/2026-01-03-config-improvements.md deleted file mode 100644 index 2744e91..0000000 --- a/docs/sessions/2026-01-03-config-improvements.md +++ /dev/null @@ -1,206 +0,0 @@ -# Config File Improvements & Main.cpp Refactoring - -**Date:** 2026-01-03 - -## Overview - -This session focused on refactoring main.cpp into smaller functions and adding support for eccentric orbits through an extended configuration file format. - -## Changes Made - -### 1. Main.cpp Refactoring - -Broke down 215-line main() function into focused, reusable functions: - -**New Functions:** -- `parse_command_line_args()` - Parse CLI args into ProgramArgs struct -- `print_startup_info()` - Display simulation configuration -- `run_headless_simulation()` - Terminal-based simulation with state capture -- `run_gui_simulation()` - 3D visualization mode - -**Result:** main() now only ~25 lines (setup and dispatch) - -**Additional Improvements:** -- Added initial state capture in headless mode -- Initial state now printed both at start AND end for comparison -- Cleaner separation of concerns - -### 2. Eccentric Orbit Support - -Extended config format from 10 to 12 fields: - -**Old Format (10 fields):** -``` -name mass radius x y z parent_index r g b -``` - -**New Format (12 fields):** -``` -name mass radius x y z parent_index r g b eccentricity semi_major_axis -``` - -**Implementation:** -- Uses vis-viva equation: `v = sqrt(G*M*(2/r - 1/a))` -- Circular orbits: e=0, a=orbital_radius -- Elliptical orbits: e>0, a=semi_major_axis -- Unified code path for both orbit types - -**Example Configurations:** -``` -# Circular orbit -Earth 5.972e24 6.371e6 1.496e11 0 0 0 0.0 0.5 1.0 0 1.496e11 - -# Eccentric orbit (e=0.7) -Comet 1e14 5e3 1.122e11 0 0 0 0.5 0.8 1.0 0.7 3.74e11 -``` - -### 3. Code Simplification - -- Removed dual format parsing (now single unified format) -- Shortened function name: `calculate_initial_velocities_with_params()` → `calculate_velocities()` -- Removed `OrbitParams.has_params` field (always have params now) -- Cleaner velocity calculation logic - -### 4. Testing - -Created test_simple.txt with eccentric comet: -- Eccentricity: 0.7 -- Semi-major axis: 2.5 AU -- Perihelion: 0.75 AU -- Aphelion: 4.25 AU - -**Test Results:** -- ✓ Initial velocity: 44.849 km/s (matches theoretical) -- ✓ Position varies from 0.75 AU to ~3.8 AU over simulation -- ✓ Velocity varies from 44.8 km/s (perihelion) to 10.6 km/s (aphelion) -- ✓ Energy conservation maintained - -### 5. Documentation Updates - -**README.md:** -- Updated config format section with 12-field format -- Added examples for both circular and eccentric orbits -- Added "Eccentric orbit support" to features list -- Updated field descriptions - -**docs/config_assumptions.md:** -- Documented fixed issues (eccentric orbits, main.cpp refactoring) -- Updated format assumptions (10 → 12 fields) -- Added prioritized TODO list -- Added session notes with detailed change log - -## Git Commits - -1. `e5da7aa` - Refactor main.cpp into focused functions - - Extracted argument parsing, headless sim, GUI sim - - Added initial state capture for comparison - -2. `17f11bb` - Add eccentric orbit support with unified config format - - Extended format to 12 fields - - Implemented vis-viva equation - - Added example comet configuration - -3. `8b9a06e` - Update documentation for eccentric orbit support - - Updated README with new format - - Updated config_assumptions.md - -4. `61ac1c5` - Add session notes and TODOs to config documentation - - Documented all session changes - - Created prioritized action items - -## Files Modified - -**Source Code:** -- src/main.cpp (refactored into functions) -- src/config_loader.cpp (added orbit parameters support) - -**Configuration:** -- configs/test_simple.txt (updated to 12-field format + comet) - -**Documentation:** -- README.md (new format examples) -- docs/config_assumptions.md (status updates + TODOs) - -## Known Issues & TODOs - -**HIGH PRIORITY:** -- [ ] Update configs/solar_system.txt to new 12-field format -- [ ] Update configs/example_binary_star.txt to new 12-field format -- [ ] Fix Moon position in solar_system.txt - - Current: (1.500e11, 0, 0) - 4 million km from Earth - - Should: (~1.496e11 + 3.844e8, 0, 0) - 384,400 km from Earth -- [ ] Fix Jupiter's moons positions (same issue as Moon) - -**MEDIUM PRIORITY:** -- [ ] Add config file validation -- [ ] Document coordinate system clearly (absolute vs relative) - -**LOW PRIORITY:** -- [ ] Consider relative coordinate option for child bodies -- [ ] Add 3D orbit support (currently XY plane only) - -## Technical Notes - -### Vis-Viva Equation - -``` -v = sqrt(G*M*(2/r - 1/a)) -``` - -Where: -- v = orbital velocity at current position -- G = gravitational constant -- M = parent body mass -- r = current distance from parent -- a = semi-major axis of orbit - -**For circular orbits (e=0):** -- r = a (constant) -- Equation simplifies to: `v = sqrt(G*M/r)` - -**For eccentric orbits (e>0):** -- At perihelion (r = a(1-e)): velocity is maximum -- At aphelion (r = a(1+e)): velocity is minimum -- Demonstrates Kepler's 2nd law (equal areas in equal times) - -**Orbital Period:** -``` -T = 2π * sqrt(a³/GM) -``` - -Example for comet (a=2.5 AU): T ≈ 1444 days - -## Testing Commands - -**Build:** -```bash -make -``` - -**Run with default config (currently test_simple.txt):** -```bash -./orbit_sim -``` - -**Run headless for 1000 days:** -```bash -./orbit_sim --days 1000 -``` - -**Run with specific config:** -```bash -./orbit_sim configs/test_simple.txt -``` - -**Run headless with readable units:** -```bash -./orbit_sim --headless --readable --days 365 -``` - -## Next Session Recommendations - -1. Update remaining config files to 12-field format -2. Fix moon positions with correct physics -3. Test updated configurations -4. Consider adding config validation warnings -5. Possibly add argument of periapsis parameter for 3D orbit orientation diff --git a/docs/sessions/2026-01-04-condensing-documentation.md b/docs/sessions/2026-01-04-condensing-documentation.md new file mode 100644 index 0000000..f1ced98 --- /dev/null +++ b/docs/sessions/2026-01-04-condensing-documentation.md @@ -0,0 +1,50 @@ +# Documentation Condensing Session (2026-01-04) + +## Changes Made: + +### 1. Condensed implementation_plan.md (236→112 lines) +- Renamed to "Technical Reference" +- Updated data structures to match actual code (added eccentricity, semi_major_axis, max_bodies, RenderState) +- Replaced detailed implementation steps with completed/remaining status +- Removed redundant function lists (already in headers) +- Added user's note about Newton-Raphson propagation method + +### 2. Condensed test_verification.md (143→62 lines) +- Updated for current test_simple.txt (4 bodies including eccentric comet) +- Removed detailed step-by-step verification points +- Kept essential: test command, expected behavior, tolerances + +### 3. Condensed config_assumptions.md (115→44 lines) +- Removed redundant format documentation (already in README.md) +- Removed verbose session notes and code references +- Focused on active TODOs and known bugs only + +### 4. Removed architecture duplication from CLAUDE.md +- Removed ~70 lines of detailed architecture (duplicate of verbose_project_overview.md) +- Now points to verbose_project_overview.md for technical details +- Added `make test` to common commands + +### 5. Removed common commands from verbose_project_overview.md +- Commands now only in CLAUDE.md (single source) +- Remains canonical technical architecture reference + +### 6. Added test target to Makefile +- `make test` runs: `./orbit_sim configs/test_simple.txt --headless --readable --days 365` + +## File Purposes Established + +- **README.md**: User-facing guide +- **CLAUDE.md**: Concise Claude guidance + commands +- **docs/verbose_project_overview.md**: Canonical technical architecture +- **docs/implementation_plan.md**: Data structures reference +- **docs/config_assumptions.md**: Active issues & TODOs +- **docs/test_verification.md**: Test reference + +## Commits + +- `af1b54b` Condense and deduplicate project documentation + +## Results + +Net reduction: 278 lines removed (6 files changed, +132/-410) +Documentation now DRY with clear separation of concerns.