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Firefly - FPS - (2) Walls and Collision

This is my second Firefly example intended to reach the end goal of a pseudo-3D graphic FPS using 2D sprites and no Y dimensional movement. The inspiration is Wolfenstein 3D and Doom. The latter had more features and broke more into the Y dimension.

(1) You will be able to move on the X-Z plane and look in all directions.
(2) Walls are created and the player collides with them.

Assets:
• https://www.spriters-resource.com/pc_computer/wolfenstein3d/
  
• Wolfenstein 3D assets are copyright of
  Developer(s) id Software
  Publisher(s) Apogee Software and FormGen (Spear of Destiny)
  https://en.wikipedia.org/wiki/Wolfenstein_3D
  
  Collision:
  
• Code from 4_and_a_half_star_games:
  http://community.clickteam.com/threads/99897-Looking-with-the-mouse-is-very-jittery-and-slowly-while-walking