Ship Movement Physics: Drag & Thrust (clamp?)

[antfarmar]

Currently the ship's rigidbody has non-zero drag.

• it prevents fast velocities when accelerating.
• it slows the ship down to rest when gliding.

In the original Asteroids vidya, constant velocity gliding was a feature. This could be implemented by:

• setting the ship rigidbody's drag to zero
• limiting/clamping it's velocity.

[antfarmar]

Initial Commit d2e04b72