Added Water Drag and Resistance

New Features

• Automatic Water Surface Detection on Start:

  • If targetSurface is not manually assigned, the script now searches for the first WaterSurface component in the scene during Start().

  • Automatically enables buoyancy when a valid water surface is found.

• Water Resistance (Drag) Simulation:

  • Added ApplyWaterResistance() method, which applies a drag force proportional to the object's velocity while in water.

  • New public variable waterDrag added to control drag strength.

 Code Changes

• Modified Start() to include automatic WaterSurface detection logic.

• Added ApplyWaterResistance() to FixedUpdate() to simulate underwater drag.

• Introduced waterDrag float for easy tuning of resistance force.

• Ensured velocity damping uses ForceMode.VelocityChange for consistent results.

 Configuration

• New Inspector Field: waterDrag (default: 1.5) — adjusts water resistance intensity.