This commit resolves several physics-related issues that were causing
unexpected behavior in ship and asteroid movement:
**Physics Sleep System**
- Fixed abrupt stops by preventing Havok from putting bodies to sleep
- Added PhysicsActivationControl.ALWAYS_ACTIVE for ship and asteroids
- Made ship sleep behavior configurable via shipPhysics.alwaysActive
- Sleep was causing sudden velocity zeroing at low speeds
**Center of Mass Issues**
- Discovered mesh-based physics calculated offset CoM: (0, -0.38, 0.37)
- Override ship center of mass to (0, 0, 0) to prevent thrust torque
- Applying force at offset CoM was creating unwanted pitch rotation
- Added debug logging to track mass properties
**Input Deadzone Improvements**
- Implemented smooth deadzone scaling (0.1-0.15 range)
- Replaced hard threshold cliff with linear interpolation
- Prevents abrupt control cutoff during gentle inputs
- Added VR mode check to disable keyboard fallback in VR
**Configuration System**
- Added DEFAULT_SHIP_PHYSICS constant as single source of truth
- Added tunable parameters: linearDamping, angularDamping, alwaysActive
- Added fuel consumption rates: linearFuelConsumptionRate, angularFuelConsumptionRate
- Tuned for 1 minute linear thrust, 2 minutes angular thrust at 60Hz
- All physics parameters now persist to localStorage
**Other Fixes**
- Changed orbit center to STATIC motion type (was ANIMATED)
- Fixed linear force application point (removed offset)
- Added ship initial velocity support from level config
- Changed physics update from every 10 frames to every physics tick
- Increased linear input threshold from 0.1 to 0.15
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
