Physics materials

[EIREXE]

In order for physics-based objects to make sense, they should have physics materials applied to them individually.

Physics materials should include:

• Engine physics material: Godot/Jolt PhysicsMaterial values.
  • Physics related things, such as friction, bounciness etc...
• Density (to be used for mass calculations when compiling maps).
• Audio emission parameters
  • Pitch minimum/maximum (to be picked at random)
  • Volume multiplier
  • Different audios for different use cases, can contain more than one (one will be picked at random when needed).
    • Impact hard
    • Impact soft
    • Scrape rough
    • Scrape smooth
    • Bullet/projectile impact
    • Breaking
• Hearing system related parameters
  • Noise emission range
  • Minimum velocity/energy

TODO: Perhaps only breakable objects should be able to emit noises, that way the player can tell they are supposed to do that? Who knows.