# Physics Module Reorganization Plan

## 1. particle.py

Contains core particle functionality:

- Full Particle class definition
- particle_properties handling
- create_particle()
- create_particle_circle()
- transform_particle()
- get_particle_state()

## 2. forces.py

Physics and movement systems:

- calculate_forces()
- _apply_neighbor_forces()
- apply_gravity()
- apply_physics()
- add_wind_zone()
- handle_gas_movement()

## 3. interactions.py

Particle interaction handling:

- handle_particle_interactions()
- process_interaction()
- mix_liquids()
- create_mud()
- handle_particle_damage()
- _get_quick_neighbors()

## 4. temperature.py

Temperature and state management:

- handle_temperature()
- handle_phase_transitions()
- burning()
- spread_fire()
- ignite_particle()
- handle_special_particles()

## 5. grid.py

Spatial management systems:

- update_spatial_grid()
- get_cell_key()
- add_to_spatial_grid()
- remove_from_spatial_grid()
- _get_neighbors_from_grid()
- _wake_neighbors()
- clear_particles_circle()

## 6. simulation.py

Core simulation coordination:

- Simulation class (main orchestrator)
- simulate_step()
- track_tps()
- reset_particle_count()
- get_accurate_particle_count()

## Migration Steps

1. Create new files
2. Move related code sections
3. Update imports
4. Test each component
5. Update main simulation.py references